diff --git a/README.md b/README.md
index de42081..be9ac44 100644
--- a/README.md
+++ b/README.md
@@ -73,18 +73,12 @@ It is just so interesting. What it can do is under exploration.
 >
 > Tips: When updating, please keep the original database in case of data loss.
 
-### Version 2.11.0
-
-- 适用于Arcaea 4.3.0版本 For Arcaea 4.3.0
-- 新搭档 **霞玛（大～宇～宙）**、**米露可（大～宇～宙）**、**紫黑**、**百合咲美香** 已解锁 Unlock the character **Shama(UNiVERSE)**, **Milk(UNiVERSE)**, **Shikoku**, **Mika Yurisaki**.
-- 搭档 **依莉丝** 已觉醒 Uncap the character **Ilith**.
-- 为觉醒 **依莉丝** 以及 **百合咲美香** 的技能提供支持 Add support for the skills of uncapped **Ilith** and **Mika Yurisaki**.
-- 为 Beyond 图倍增提供支持 Add support for beyond gauge boost.
-- 为 Beyond 连锁图提供支持 Add support for beyond chain maps.
-- 修复联机时无人房间仍可进入的问题 Fix a logic bug that the room without anyone can be entered in multiplayer.
-- 对一些数值的算法进行了更改 Some changes in some values' algorithms.
-- 小重构 Link Play 子程序 Refactor simply for Link Play subprogram.
-- 新增增删改兑换码、购买项目、登陆奖励、物品的API接口 Add some API endpoints, including creating, changing, deleting about redeem, purchase, login present and item.
+### Version 2.11.1
+
+- 适用于Arcaea 4.4.0版本 For Arcaea 4.4.0
+- 新搭档 **密特拉·泰尔塞拉**、**不来方斗亚** 已解锁 Unlock the character **Mithra Tercera** and **Toa Kozukata**.
+- 为 **密特拉·泰尔塞拉** 的技能提供支持 Add support for the skill of **Mithra Tercera**.
+- 新增修改搭档的API接口 Add some API endpoints about characters.
 
 ## 运行环境与依赖 Running environment and requirements
 
diff --git a/latest version/api/__init__.py b/latest version/api/__init__.py
index 0eab643..7be2d23 100644
--- a/latest version/api/__init__.py	
+++ b/latest version/api/__init__.py	
@@ -1,7 +1,7 @@
 from flask import Blueprint
 
 from . import (users, songs, token, system, items,
-               purchases, presents, redeems)
+               purchases, presents, redeems, characters)
 
 bp = Blueprint('api', __name__, url_prefix='/api/v1')
 bp.register_blueprint(users.bp)
@@ -12,3 +12,4 @@
 bp.register_blueprint(purchases.bp)
 bp.register_blueprint(presents.bp)
 bp.register_blueprint(redeems.bp)
+bp.register_blueprint(characters.bp)
diff --git a/latest version/api/api_auth.py b/latest version/api/api_auth.py
index 8f8cfdd..4322cc5 100644
--- a/latest version/api/api_auth.py	
+++ b/latest version/api/api_auth.py	
@@ -52,11 +52,12 @@ def wrapped_view(*args, **kwargs):
 
 def request_json_handle(request, required_keys: list = [], optional_keys: list = [], must_change: bool = False, is_batch: bool = False):
     '''
-        提取post参数，返回dict，写成了修饰器\ 
-        parameters: \ 
-        `request`: `Request` - 当前请求\ 
-        `required_keys`: `list` - 必须的参数\ 
-        `optional_keys`: `list` - 可选的参数\ 
+        提取post参数，返回dict，写成了修饰器
+
+        parameters:
+        `request`: `Request` - 当前请求
+        `required_keys`: `list` - 必须的参数
+        `optional_keys`: `list` - 可选的参数
         `must_change`: `bool` - 当全都是可选参数时，是否必须有至少一项修改
     '''
 
@@ -113,8 +114,7 @@ def wrapped_view(*args, **kwargs):
             data = view(*args, **kwargs)
             if data is None:
                 return error_return()
-            else:
-                return data
+            return data
         except ArcError as e:
             if Config.ALLOW_WARNING_LOG:
                 current_app.logger.warning(format_exc())
diff --git a/latest version/api/api_code.py b/latest version/api/api_code.py
index d290431..bf7a807 100644
--- a/latest version/api/api_code.py	
+++ b/latest version/api/api_code.py	
@@ -23,6 +23,8 @@
     -122: 'Item already exists',
     -123: 'The collection already has this item',
     -124: 'The collection does not have this item',
+    -130: 'No such character',
+    -131: 'Invalid skill ID',
     -200: 'No permission',  # 2xx用户相关错误
     -201: 'Wrong username or password',
     -202: 'User is banned',
diff --git a/latest version/api/characters.py b/latest version/api/characters.py
new file mode 100644
index 0000000..db44830
--- /dev/null
+++ b/latest version/api/characters.py	
@@ -0,0 +1,134 @@
+from flask import Blueprint, request
+
+from core.error import InputError, NoData
+from core.item import ItemFactory
+from core.character import Character
+from core.sql import Connect, Query, Sql
+
+from .api_auth import api_try, request_json_handle, role_required
+from .api_code import success_return
+from .constant import Constant
+
+
+bp = Blueprint('characters', __name__, url_prefix='/characters')
+
+
+@bp.route('', methods=['GET'])
+@role_required(request, ['select'])
+@request_json_handle(request, optional_keys=Constant.QUERY_KEYS)
+@api_try
+def characters_get(data, user):
+    '''查询全角色信息'''
+    A = ['character_id', 'name', 'skill_id',
+         'skill_id_uncap', 'char_type', 'is_uncapped']
+    B = ['name', 'skill_id', 'skill_id_uncap']
+    C = ['name', 'frag1', 'prog1', 'overdrive1', 'frag20',
+         'prog20', 'overdrive20', 'frag30', 'prog30', 'overdrive30']
+    with Connect() as c:
+        query = Query(A, B, C).from_dict(data)
+        x = Sql(c).select('character', query=query)
+        r = [Character().from_list(i) for i in x]
+
+        if not r:
+            raise NoData(api_error_code=-2)
+
+        return success_return([x.to_dict() for x in r])
+
+
+@bp.route('/<int:character_id>', methods=['GET'])
+@role_required(request, ['select'])
+@api_try
+def characters_character_get(user, character_id: int):
+    # 包含core
+    with Connect() as c:
+        c = Character(c).select(character_id)
+        c.select_character_core()
+        return success_return(c.to_dict(has_cores=True))
+
+
+@bp.route('/<int:character_id>', methods=['PUT'])
+@role_required(request, ['change'])
+@request_json_handle(request, optional_keys=['max_level', 'skill_id', 'skill_id_uncap', 'skill_unlock_level', 'skill_requires_uncap', 'char_type', 'is_uncapped', 'frag1', 'prog1', 'overdrive1', 'frag20', 'prog20', 'overdrive20', 'frag30', 'prog30', 'overdrive30'], must_change=True)
+@api_try
+def characters_character_put(data, user, character_id: int):
+    '''修改角色信息'''
+    if ('skill_id' in data and data['skill_id'] != '' and data['skill_id'] not in Constant.SKILL_IDS) or ('skill_id_uncap' in data and data['skill_id_uncap'] != '' and data['skill_id_uncap'] not in Constant.SKILL_IDS):
+        raise InputError('Invalid skill_id', api_error_code=-131)
+    with Connect() as c:
+        c = Character(c).select(character_id)
+        try:
+            if 'max_level' in data:
+                c.max_level = int(data['max_level'])
+            if 'skill_id' in data:
+                c.skill_id = data['skill_id']
+            if 'skill_id_uncap' in data:
+                c.skill_id_uncap = data['skill_id_uncap']
+            if 'skill_unlock_level' in data:
+                c.skill_unlock_level = int(data['skill_unlock_level'])
+            if 'skill_requires_uncap' in data:
+                c.skill_requires_uncap = data['skill_requires_uncap'] == 1
+            if 'char_type' in data:
+                c.char_type = int(data['char_type'])
+            if 'is_uncapped' in data:
+                c.is_uncapped = data['is_uncapped'] == 1
+            t = ['frag1', 'prog1', 'overdrive1', 'frag20', 'prog20',
+                 'overdrive20', 'frag30', 'prog30', 'overdrive30']
+            for i in t:
+                if i not in data:
+                    continue
+                if i.endswith('1'):
+                    x = getattr(c, i[:-1])
+                    x.start = float(data[i])
+                elif i.endswith('20'):
+                    x = getattr(c, i[:-2])
+                    x.mid = float(data[i])
+                else:
+                    x = getattr(c, i[:-2])
+                    x.end = float(data[i])
+        except ValueError as e:
+            raise InputError('Invalid input', api_error_code=-101) from e
+        c.update()
+        return success_return(c.to_dict())
+
+
+@bp.route('/<int:character_id>/cores', methods=['GET'])
+@role_required(request, ['select'])
+@api_try
+def characters_character_cores_get(user, character_id: int):
+    with Connect() as c:
+        c = Character(c)
+        c.character_id = character_id
+        c.select_character_core()
+        return success_return(c.uncap_cores_to_dict())
+
+
+@bp.route('/<int:character_id>/cores', methods=['PATCH'])
+@role_required(request, ['change'])
+@request_json_handle(request, is_batch=True)
+@api_try
+def characters_character_cores_patch(data, user, character_id: int):
+    '''修改角色觉醒cores'''
+    def force_type_core(x: dict) -> dict:
+        x['item_type'] = 'core'
+        x['type'] = 'core'
+        return x
+
+    with Connect() as c:
+        ch = Character(c)
+        ch.character_id = character_id
+        ch.select_character_core()
+        ch.remove_items([ItemFactory.from_dict(x, c=c)
+                         for x in map(force_type_core, data.get('remove', []))])
+        ch.add_items([ItemFactory.from_dict(x, c=c)
+                      for x in map(force_type_core, data.get('create', []))])
+        updates = list(map(force_type_core, data.get('update', [])))
+        for x in updates:
+            if 'amount' not in x:
+                raise InputError('`amount` is required in `update`')
+            if not isinstance(x['amount'], int) or x['amount'] <= 0:
+                raise InputError(
+                    '`amount` must be a positive integer', api_error_code=-101)
+
+        ch.update_items(
+            [ItemFactory.from_dict(x, c=c) for x in updates])
+        return success_return(ch.uncap_cores_to_dict())
diff --git a/latest version/api/constant.py b/latest version/api/constant.py
index 1b4cf66..c17e9cb 100644
--- a/latest version/api/constant.py	
+++ b/latest version/api/constant.py	
@@ -2,3 +2,6 @@ class Constant:
     QUERY_KEYS = ['limit', 'offset', 'query', 'fuzzy_query', 'sort']
 
     PATCH_KEYS = ['create', 'update', 'remove']
+
+    SKILL_IDS = ['gauge_easy', 'note_mirror', 'gauge_hard', 'frag_plus_10_pack_stellights', 'gauge_easy|frag_plus_15_pst&prs', 'gauge_hard|fail_frag_minus_100', 'frag_plus_5_side_light', 'visual_hide_hp', 'frag_plus_5_side_conflict', 'challenge_fullcombo_0gauge', 'gauge_overflow', 'gauge_easy|note_mirror', 'note_mirror', 'visual_tomato_pack_tonesphere', 'frag_rng_ayu', 'gaugestart_30|gaugegain_70', 'combo_100-frag_1', 'audio_gcemptyhit_pack_groovecoaster', 'gauge_saya', 'gauge_chuni', 'kantandeshou', 'gauge_haruna', 'frags_nono', 'gauge_pandora', 'gauge_regulus', 'omatsuri_daynight',
+                 'sometimes(note_mirror|frag_plus_5)', 'scoreclear_aa|visual_scoregauge', 'gauge_tempest', 'gauge_hard', 'gauge_ilith_summer', 'frags_kou', 'visual_ink', 'shirabe_entry_fee', 'frags_yume', 'note_mirror|visual_hide_far', 'frags_ongeki', 'gauge_areus', 'gauge_seele', 'gauge_isabelle', 'gauge_exhaustion', 'skill_lagrange', 'gauge_safe_10', 'frags_nami', 'skill_elizabeth', 'skill_lily', 'skill_kanae_midsummer', 'eto_uncap', 'luna_uncap', 'frags_preferred_song', 'visual_ghost_skynotes', 'ayu_uncap', 'skill_vita', 'skill_fatalis', 'skill_reunion', 'frags_ongeki_slash', 'frags_ongeki_hard', 'skill_amane', 'skill_kou_winter', 'gauge_hard|note_mirror', 'skill_shama', 'skill_milk', 'skill_shikoku', 'skill_mika', 'ilith_awakened_skill', 'skill_mithra', 'skill_toa']
diff --git a/latest version/api/token.py b/latest version/api/token.py
index d096779..a5e3609 100644
--- a/latest version/api/token.py	
+++ b/latest version/api/token.py	
@@ -17,21 +17,22 @@
 @api_try
 def token_post(data):
     '''
-        登录，获取token\ 
+        登录，获取token
+
         {'auth': base64('<user_id>:<password>')}
     '''
     try:
         auth_decode = bytes.decode(b64decode(data['auth']))
-    except:
-        raise PostError(api_error_code=-100)
-    if not ':' in auth_decode:
+    except Exception as e:
+        raise PostError(api_error_code=-100) from e
+    if ':' not in auth_decode:
         raise PostError(api_error_code=-100)
     name, password = auth_decode.split(':', 1)
 
     with Connect() as c:
         user = APIUser(c)
         user.login(name, password, request.remote_addr)
-        return success_return({'token': user.token, 'user_id': user.user_id})
+        return success_return({'token': user.api_token, 'user_id': user.user_id})
 
 
 @bp.route('', methods=['GET'])
diff --git a/latest version/api/users.py b/latest version/api/users.py
index c23139a..b63376e 100644
--- a/latest version/api/users.py	
+++ b/latest version/api/users.py	
@@ -128,7 +128,7 @@ def users_user_b30_get(user, user_id):
                 f'No best30 data of user `{user_id}`', api_error_code=-3)
         x.select_song_name()
         r = x.to_dict_list()
-        rating_sum = sum([i.rating for i in x.scores])
+        rating_sum = sum(i.rating for i in x.scores)
         return success_return({'user_id': user_id, 'b30_ptt': rating_sum / 30, 'data': r})
 
 
diff --git a/latest version/core/api_user.py b/latest version/core/api_user.py
index ec0ba03..314ae9c 100644
--- a/latest version/core/api_user.py	
+++ b/latest version/core/api_user.py	
@@ -55,8 +55,8 @@ def select_from_id(self, role_id: int = None) -> 'Role':
                        {'a': self.role_id})
         x = self.c.fetchone()
         if x is None:
-            raise NoData('The role `%s` does not exist.' %
-                         self.role_id, api_error_code=-200)
+            raise NoData(
+                f'The role `{self.role_id}` does not exist.', api_error_code=-200)
         self.caption = x[0]
         return self
 
@@ -133,19 +133,19 @@ def login(self, name: str = None, password: str = None, ip: str = None) -> None:
                        'a': self.name})
         x = self.c.fetchone()
         if x is None:
-            raise NoData('The user `%s` does not exist.' %
-                         self.name, api_error_code=-201, status=401)
+            raise NoData(
+                f'The user `{self.name}` does not exist.', api_error_code=-201, status=401)
         if x[1] == '':
-            raise UserBan('The user `%s` is banned.' % self.name)
+            raise UserBan(f'The user `{self.name}` is banned.')
         if self.hash_pwd != x[1]:
             raise NoAccess('The password is incorrect.',
                            api_error_code=-201, status=401)
 
         self.user_id = x[0]
         now = int(time() * 1000)
-        self.token = sha256(
+        self.api_token = sha256(
             (str(self.user_id) + str(now)).encode("utf8") + urandom(8)).hexdigest()
 
         self.logout()
         self.c.execute('''insert into api_login values(?,?,?,?)''',
-                       (self.user_id, self.token, now, self.ip))
+                       (self.user_id, self.api_token, now, self.ip))
diff --git a/latest version/core/character.py b/latest version/core/character.py
index 41db641..2a910ec 100644
--- a/latest version/core/character.py	
+++ b/latest version/core/character.py	
@@ -1,7 +1,7 @@
 from .config_manager import Config
 from .constant import Constant
 from .error import ArcError, InputError, ItemNotEnough, NoData
-from .item import Item, ItemCore
+from .item import CollectionItemMixin, ItemCore
 
 
 class Level:
@@ -9,9 +9,9 @@ class Level:
     min_level = 1
 
     def __init__(self) -> None:
-        self.max_level = None
-        self.level = None
-        self.exp = None
+        self.max_level: int = None
+        self.level: int = None
+        self.exp: float = None
 
     @property
     def level_exp(self):
@@ -29,9 +29,9 @@ def add_exp(self, exp_addition: float):
 
         a = []
         b = []
-        for i in Constant.LEVEL_STEPS:
-            a.append(i)
-            b.append(Constant.LEVEL_STEPS[i])
+        for k, v in Constant.LEVEL_STEPS.items():
+            a.append(k)
+            b.append(v)
 
         if exp < b[0]:  # 向下溢出，是异常状态，不该被try捕获，不然数据库无法回滚
             raise ValueError('EXP value error.')
@@ -46,23 +46,10 @@ def add_exp(self, exp_addition: float):
 
 class Skill:
     def __init__(self) -> None:
-        self.skill_id = None
-        self.skill_id_uncap = None
-        self.skill_unlock_level = None
-        self.skill_requires_uncap = None
-
-
-class Core(Item):
-    item_type = 'core'
-
-    def __init__(self, core_type: str = '', amount: int = 0) -> None:
-        super().__init__()
-        self.item_id = core_type
-        self.amount = amount
-        self.is_available = True
-
-    def to_dict(self):
-        return {'core_type': self.item_id, 'amount': self.amount}
+        self.skill_id: str = None
+        self.skill_id_uncap: str = None
+        self.skill_unlock_level: int = None
+        self.skill_requires_uncap: bool = None
 
 
 class CharacterValue:
@@ -75,8 +62,7 @@ def _calc_char_value_20_math(level: int, value_1: float, value_20: float) -> flo
         # 4/6859 = 0.00058317539
         if level <= 10:
             return 0.00058317539 * (level - 1) ** 3 * (value_20 - value_1) + value_1
-        else:
-            return - 0.00058317539 * (20 - level) ** 3 * (value_20 - value_1) + value_20
+        return - 0.00058317539 * (20 - level) ** 3 * (value_20 - value_1) + value_20
 
     # @staticmethod
     # def _calc_char_value_20(level: int, stata, statb, lva=1, lvb=20) -> float:
@@ -95,44 +81,51 @@ def _calc_char_value_30(level, stata, statb, lva=20, lvb=30):
         return (level - lva) * (statb - stata) / (lvb - lva) + stata
 
     def set_parameter(self, start: float = 0, mid: float = 0, end: float = 0):
-        self.start = start
-        self.mid = mid
-        self.end = end
+        self.start: float = start
+        self.mid: float = mid
+        self.end: float = end
 
     def get_value(self, level: Level):
         if level.min_level <= level.level <= level.mid_level:
             return self._calc_char_value_20_math(level.level, self.start, self.mid)
-        elif level.mid_level < level.level <= level.max_level:
+        if level.mid_level < level.level <= level.max_level:
             return self._calc_char_value_30(level.level, self.mid, self.end)
-        else:
-            return 0
+        return 0
 
 
-class Character:
+class Character(CollectionItemMixin):
     database_table_name = None
 
+    collection_item_const = {
+        'name': 'character',
+        'table_name': 'char_item',
+        'table_primary_key': 'character_id',
+        'id_name': 'character_id',
+        'items_name': 'uncap_cores'
+    }
+
     def __init__(self, c=None) -> None:
         self.c = c
 
-        self.character_id = None
-        self.name = None
-        self.char_type = None
-        self.is_uncapped = None
-        self.is_uncapped_override = None
+        self.character_id: int = None
+        self.name: str = None
+        self.char_type: int = None
+        self.is_uncapped: bool = None
+        self.is_uncapped_override: bool = None
         self.skill = Skill()
         self.level = Level()
         self.frag = CharacterValue()
         self.prog = CharacterValue()
         self.overdrive = CharacterValue()
-        self.uncap_cores = []
-        self.voice = None
+        self.uncap_cores: list = []
+        self.voice: list = None
 
     @property
     def skill_id_displayed(self) -> str:
         return None
 
     def uncap_cores_to_dict(self):
-        return [x.to_dict() for x in self.uncap_cores]
+        return [x.to_dict(character_format=True) for x in self.uncap_cores]
 
     @property
     def is_uncapped_displayed(self) -> bool:
@@ -144,11 +137,71 @@ def is_base_character(self) -> bool:
         # 应该是只有对立这样
         return self.character_id == 1
 
-    def to_dict(self) -> dict:
-        pass
+    def to_dict(self, has_cores=False) -> dict:
+        # 用于API里，游戏内的数据不太一样，故不能super
+        r = {
+            'character_id': self.character_id,
+            'name': self.name,
+            'char_type': self.char_type,
+            'is_uncapped': self.is_uncapped,
+            'max_level': self.level.max_level,
+            'skill_id': self.skill.skill_id,
+            'skill_unlock_level': self.skill.skill_unlock_level,
+            'skill_requires_uncap': self.skill.skill_requires_uncap,
+            'skill_id_uncap': self.skill.skill_id_uncap,
+            'frag1': self.frag.start,
+            'frag20': self.frag.mid,
+            'frag30': self.frag.end,
+            'prog1': self.prog.start,
+            'prog20': self.prog.mid,
+            'prog30': self.prog.end,
+            'overdrive1': self.overdrive.start,
+            'overdrive20': self.overdrive.mid,
+            'overdrive30': self.overdrive.end,
+        }
+        if has_cores:
+            r['uncap_cores'] = self.uncap_cores_to_dict()
+        return r
 
-    def from_list(self, l: list) -> 'Character':
-        pass
+    def from_list(self, l: tuple) -> 'Character':
+        self.character_id = l[0]
+        self.name = l[1]
+        self.level.max_level = l[2]
+        self.frag.set_parameter(l[3], l[6], l[9])
+        self.prog.set_parameter(l[4], l[7], l[10])
+        self.overdrive.set_parameter(l[5], l[8], l[11])
+        self.skill.skill_id = l[12]
+        self.skill.skill_unlock_level = l[13]
+        self.skill.skill_requires_uncap = l[14] == 1
+        self.skill.skill_id_uncap = l[15]
+        self.char_type = l[16]
+        self.is_uncapped = l[17] == 1
+        return self
+
+    def select(self, character_id: int = None) -> 'Character':
+        if character_id is not None:
+            self.character_id = character_id
+        self.c.execute(
+            'select * from character where character_id = ?', (self.character_id,))
+        x = self.c.fetchone()
+        if not x:
+            raise NoData(
+                f'No such character: {self.character_id}', api_error_code=-130)
+        return self.from_list(x)
+
+    def update(self) -> None:
+        self.c.execute('''update character set name = ?, max_level = ?, frag1 = ?, frag20 = ?, frag30 = ?, prog1 = ?, prog20 = ?, prog30 = ?, overdrive1 = ?, overdrive20 = ?, overdrive30 = ?, skill_id = ?, skill_unlock_level = ?, skill_requires_uncap = ?, skill_id_uncap = ?, char_type = ?, is_uncapped = ? where character_id = ?''', (
+            self.name, self.level.max_level, self.frag.start, self.frag.mid, self.frag.end, self.prog.start, self.prog.mid, self.prog.end, self.overdrive.start, self.overdrive.mid, self.overdrive.end, self.skill.skill_id, self.skill.skill_unlock_level, self.skill.skill_requires_uncap, self.skill.skill_id_uncap, self.char_type, self.is_uncapped, self.character_id))
+
+    def select_character_core(self):
+        # 获取此角色所需核心
+        self.c.execute(
+            '''select item_id, amount from char_item where character_id = ? and type="core"''', (self.character_id,))
+        x = self.c.fetchall()
+        if x:
+            self.uncap_cores = []
+            for i in x:
+                self.uncap_cores.append(ItemCore(self.c, i[0], i[1]))
 
 
 class UserCharacter(Character):
@@ -169,27 +222,16 @@ def skill_id_displayed(self) -> str:
         '''对外显示的技能id'''
         if self.is_uncapped_displayed and self.skill.skill_id_uncap:
             return self.skill.skill_id_uncap
-        elif self.skill.skill_id and self.level.level >= self.skill.skill_unlock_level:
+        if self.skill.skill_id and self.level.level >= self.skill.skill_unlock_level:
             return self.skill.skill_id
-        else:
-            return None
-
-    def select_character_core(self):
-        # 获取此角色所需核心
-        self.c.execute(
-            '''select item_id, amount from char_item where character_id = ? and type="core"''', (self.character_id,))
-        x = self.c.fetchall()
-        if x:
-            self.uncap_cores = []
-            for i in x:
-                self.uncap_cores.append(Core(i[0], i[1]))
+        return None
 
     def select_character_uncap_condition(self, user=None):
         # parameter: user - User类或子类的实例
         # 获取此角色的觉醒信息
         if user:
             self.user = user
-        self.c.execute('''select is_uncapped, is_uncapped_override from %s where user_id = :a and character_id = :b''' % self.database_table_name,
+        self.c.execute(f'''select is_uncapped, is_uncapped_override from {self.database_table_name} where user_id = :a and character_id = :b''',
                        {'a': self.user.user_id, 'b': self.character_id})
 
         x = self.c.fetchone()
@@ -206,7 +248,7 @@ def select_character_info(self, user=None):
         # 获取所给用户此角色信息
         if user:
             self.user = user
-        self.c.execute('''select * from %s a,character b where a.user_id=? and a.character_id=b.character_id and a.character_id=?''' % self.database_table_name,
+        self.c.execute(f'''select * from {self.database_table_name} a,character b where a.user_id=? and a.character_id=b.character_id and a.character_id=?''',
                        (self.user.user_id, self.character_id))
 
         y = self.c.fetchone()
@@ -228,7 +270,7 @@ def select_character_info(self, user=None):
         self.skill.skill_unlock_level = y[19]
         self.skill.skill_requires_uncap = y[20] == 1
 
-        if self.character_id == 21 or self.character_id == 46:
+        if self.character_id in (21, 46):
             self.voice = [0, 1, 2, 3, 100, 1000, 1001]
 
         self.select_character_core()
@@ -267,7 +309,7 @@ def change_uncap_override(self, user=None):
         # 切换觉醒状态
         if user:
             self.user = user
-        self.c.execute('''select is_uncapped, is_uncapped_override from %s where user_id = :a and character_id = :b''' % self.database_table_name,
+        self.c.execute(f'''select is_uncapped, is_uncapped_override from {self.database_table_name} where user_id = :a and character_id = :b''',
                        {'a': self.user.user_id, 'b': self.character_id})
 
         x = self.c.fetchone()
@@ -277,7 +319,7 @@ def change_uncap_override(self, user=None):
         self.c.execute('''update user set is_char_uncapped_override = :a where user_id = :b''', {
             'a': 1 if x[1] == 0 else 0, 'b': self.user.user_id})
 
-        self.c.execute('''update %s set is_uncapped_override = :a where user_id = :b and character_id = :c''' % self.database_table_name, {
+        self.c.execute(f'''update {self.database_table_name} set is_uncapped_override = :a where user_id = :b and character_id = :c''', {
             'a': 1 if x[1] == 0 else 0, 'b': self.user.user_id, 'c': self.character_id})
 
         self.is_uncapped_override = x[1] == 0
@@ -311,7 +353,7 @@ def character_uncap(self, user=None):
                 raise ItemNotEnough('The cores are not enough.')
 
         for i in self.uncap_cores:
-            ItemCore(self.c, i, reverse=True).user_claim_item(self.user)
+            i.user_claim_item(self.user, reverse=True)
 
         self.c.execute('''update user_char set is_uncapped=1, is_uncapped_override=0 where user_id=? and character_id=?''',
                        (self.user.user_id, self.character_id))
@@ -382,7 +424,7 @@ def __init__(self, c=None, user=None):
 
     def select_user_characters(self):
         self.c.execute(
-            '''select character_id from %s where user_id=?''' % self.database_table_name, (self.user.user_id,))
+            f'''select character_id from {self.database_table_name} where user_id=?''', (self.user.user_id,))
         x = self.c.fetchall()
         self.characters: list = []
         if x:
diff --git a/latest version/core/config_manager.py b/latest version/core/config_manager.py
index 59359fb..4588b41 100644
--- a/latest version/core/config_manager.py	
+++ b/latest version/core/config_manager.py	
@@ -12,7 +12,7 @@ class Config:
 
     SONG_FILE_HASH_PRE_CALCULATE = True
 
-    GAME_API_PREFIX = '/join/21'
+    GAME_API_PREFIX = '/pollen/22'
 
     ALLOW_APPVERSION = []  # list[str]
 
diff --git a/latest version/core/constant.py b/latest version/core/constant.py
index edfc1ec..d534c2e 100644
--- a/latest version/core/constant.py	
+++ b/latest version/core/constant.py	
@@ -1,6 +1,6 @@
 from .config_manager import Config
 
-ARCAEA_SERVER_VERSION = 'v2.11.0'
+ARCAEA_SERVER_VERSION = 'v2.11.1'
 
 
 class Constant:
diff --git a/latest version/core/course.py b/latest version/core/course.py
index ddda103..cf6c30c 100644
--- a/latest version/core/course.py	
+++ b/latest version/core/course.py	
@@ -96,7 +96,7 @@ def select_course(self, course_id: str = None) -> 'Course':
             '''select * from course where course_id = ?''', (self.course_id,))
         x = self.c.fetchone()
         if x is None:
-            raise NoData('The course `%s` is not found.' % self.course_id)
+            raise NoData(f'The course `{self.course_id}` is not found.')
         return self.from_list(x)
 
     def select_course_chart(self) -> None:
@@ -151,7 +151,8 @@ def insert_all(self) -> None:
 
 class UserCourse(Course):
     '''
-        用户课题类\ 
+        用户课题类
+
         parameter: `user` - `User`类或子类的实例
     '''
 
@@ -200,7 +201,8 @@ def update_user_course(self) -> None:
 
 class UserCourseList:
     '''
-        用户课题列表类\ 
+        用户课题列表类
+
         parameter: `user` - `User`类或子类的实例
     '''
 
@@ -237,8 +239,9 @@ def select_all(self) -> None:
 
 class CoursePlay(UserCourse):
     '''
-        课题模式打歌类，联动UserPlay\ 
-        parameter: `user` - `UserOnline`类或子类的实例\ 
+        课题模式打歌类，联动UserPlay
+
+        parameter: `user` - `UserOnline`类或子类的实例
         'user_play` - `UserPlay`类的实例
     '''
 
diff --git a/latest version/core/download.py b/latest version/core/download.py
index 14f1edf..2718fc9 100644
--- a/latest version/core/download.py	
+++ b/latest version/core/download.py	
@@ -88,7 +88,8 @@ def parse(self) -> None:
 
 class UserDownload:
     '''
-        用户下载类\ 
+        用户下载类
+
         properties: `user` - `User`类或子类的实例
     '''
 
@@ -158,8 +159,7 @@ def url(self) -> str:
             if prefix[-1] != '/':
                 prefix += '/'
             return f'{prefix}{self.song_id}/{self.file_name}?t={self.token}'
-        else:
-            return url_for('download', file_path=f'{self.song_id}/{self.file_name}', t=self.token, _external=True)
+        return url_for('download', file_path=f'{self.song_id}/{self.file_name}', t=self.token, _external=True)
 
     @property
     def hash(self) -> str:
@@ -243,7 +243,7 @@ def add_one_song(self, song_id: str) -> None:
                     re['audio']['3'] = {"checksum": x.hash, "url": x.url}
                 else:
                     re['audio']['3'] = {"checksum": x.hash}
-            elif i == 'video.mp4' or i == 'video_audio.ogg':
+            elif i in ('video.mp4', 'video_audio.ogg'):
                 if 'additional_files' not in re:
                     re['additional_files'] = []
 
diff --git a/latest version/core/init.py b/latest version/core/init.py
index 46ecd27..fa8d172 100644
--- a/latest version/core/init.py	
+++ b/latest version/core/init.py	
@@ -41,16 +41,17 @@ def single_path(self) -> str:
 
     def table_init(self) -> None:
         '''初始化数据库结构'''
-        with open(self.sql_path, 'r') as f:
+        with open(self.sql_path, 'r', encoding='utf-8') as f:
             self.c.executescript(f.read())
         self.c.execute('''insert into config values("version", :a);''', {
             'a': ARCAEA_SERVER_VERSION})
 
     def character_init(self) -> None:
         '''初始化搭档信息'''
+        uncapped_characters = self.init_data.char_core.keys()
         for i in range(0, len(self.init_data.char)):
             skill_requires_uncap = 1 if i == 2 else 0
-            if i in [0, 1, 2, 4, 13, 26, 27, 28, 29, 36, 21, 42, 43, 11, 12, 19, 5, 10]:
+            if i in uncapped_characters:
                 max_level = 30
                 uncapable = 1
             else:
@@ -129,7 +130,7 @@ def admin_init(self) -> None:
 
         x._insert_user_char()
 
-        self.c.execute('''insert into user(user_id, name, password, join_date, user_code, rating_ptt, 
+        self.c.execute('''insert into user(user_id, name, password, join_date, user_code, rating_ptt,
         character_id, is_skill_sealed, is_char_uncapped, is_char_uncapped_override, is_hide_rating, favorite_character, max_stamina_notification_enabled, current_map, ticket, prog_boost, email)
         values(:user_id, :name, :password, :join_date, :user_code, 0, 0, 0, 0, 0, 0, -1, 0, '', :memories, 0, :email)
         ''', {'user_code': x.user_code, 'user_id': x.user_id, 'join_date': now, 'name': x.name, 'password': '41e5653fc7aeb894026d6bb7b2db7f65902b454945fa8fd65a6327047b5277fb', 'memories': 114514, 'email': x.email})
diff --git a/latest version/core/item.py b/latest version/core/item.py
index 25a9c67..e6d2c60 100644
--- a/latest version/core/item.py	
+++ b/latest version/core/item.py	
@@ -1,5 +1,5 @@
 from .config_manager import Config
-from .error import InputError, ItemNotEnough, ItemUnavailable, NoData
+from .error import DataExist, InputError, ItemNotEnough, ItemUnavailable, NoData
 
 
 class Item:
@@ -73,7 +73,8 @@ def __init__(self, c=None) -> None:
 
     def select_user_item(self, user=None):
         '''
-            查询用户item\ 
+            查询用户item
+
             parameter: `user` - `User`类或子类的实例
         '''
         if user is not None:
@@ -102,8 +103,7 @@ def user_claim_item(self, user):
                 if x[0] == 0:
                     self.is_available = False
                     raise ItemUnavailable('The item is unavailable.')
-                else:
-                    self.is_available = True
+                self.is_available = True
             else:
                 raise NoData('No item data.')
 
@@ -142,16 +142,29 @@ def user_claim_item(self, user):
 class ItemCore(PositiveItem):
     item_type = 'core'
 
-    def __init__(self, c, core=None, reverse=False) -> None:
+    def __init__(self, c, core_type: str = '', amount: int = 0) -> None:
         super().__init__(c)
         self.is_available = True
-        if core:
-            self.item_id = core.item_id
-            self.amount = - core.amount if reverse else core.amount
+        self.item_id = core_type
+        self.amount = amount
 
     def __str__(self) -> str:
         return self.item_id + '_' + str(self.amount)
 
+    def to_dict(self, has_is_available: bool = False, has_amount: bool = True, character_format: bool = False) -> dict:
+        if character_format:
+            # 搭档的core是特殊格式的
+            return {'core_type': self.item_id, 'amount': self.amount}
+        return super().to_dict(has_is_available=has_is_available, has_amount=has_amount)
+
+    def user_claim_item(self, user, reverse: bool = False) -> None:
+        # 骚操作，将amount变为负数后使用再变回来
+        if reverse:
+            self.amount = -self.amount
+        super().user_claim_item(user)
+        if reverse:
+            self.amount = -self.amount
+
 
 class ItemCharacter(UserItem):
     item_type = 'character'
@@ -257,16 +270,10 @@ def __str__(self) -> str:
 class Single(NormalItem):
     item_type = 'single'
 
-    def __init__(self, c) -> None:
-        super().__init__(c)
-
 
 class Pack(NormalItem):
     item_type = 'pack'
 
-    def __init__(self, c) -> None:
-        super().__init__(c)
-
 
 class ProgBoost(UserItem):
     item_type = 'prog_boost_300'
@@ -276,7 +283,8 @@ def __init__(self, c) -> None:
 
     def user_claim_item(self, user):
         '''
-            世界模式prog_boost\ 
+            世界模式prog_boost
+
             parameters: `user` - `UserOnline`类或子类的实例
         '''
         user.update_user_one_column('prog_boost', 300)
@@ -290,7 +298,7 @@ def __init__(self, c) -> None:
 
     def user_claim_item(self, user):
         '''
-            世界模式记忆源点或残片买体力+6\ 
+            世界模式记忆源点或残片买体力+6
             顺手清一下世界模式过载状态
         '''
         user.select_user_about_stamina()
@@ -386,8 +394,8 @@ def from_str(cls, s: str, c=None):
 
 class UserItemList:
     '''
-        用户的item列表\ 
-        注意只能查在user_item里面的，character不行\ 
+        用户的item列表
+        注意只能查在user_item里面的，character不行
         properties: `user` - `User`类或子类的实例
     '''
 
@@ -420,3 +428,63 @@ def select_from_type(self, item_type: str) -> 'UserItemList':
             self.items.append(ItemFactory.from_dict(
                 {'item_id': i[0], 'amount': amount, 'item_type': item_type}, self.c))
         return self
+
+
+class CollectionItemMixin:
+    '''
+       批量修改一些集合中的items
+    '''
+    collection_item_const = {
+        'name': 'collection',
+        'table_name': 'collection_item',
+        'table_primary_key': 'collection_id',
+        'id_name': 'collection_id',
+        'items_name': 'items'
+    }
+
+    def add_items(self, items: 'list[Item]') -> None:
+        collection_id: 'str' = getattr(
+            self, self.collection_item_const['id_name'])
+        collection_items: 'list[Item]' = getattr(
+            self, self.collection_item_const['items_name'])
+
+        for i in items:
+            if not i.select_exists():
+                raise NoData(
+                    f'No such item `{i.item_type}`: `{i.item_id}`', api_error_code=-121)
+            if i in collection_items:
+                raise DataExist(
+                    f'Item `{i.item_type}`: `{i.item_id}` already exists in {self.collection_item_const["name"]} `{collection_id}`', api_error_code=-123)
+        self.c.executemany(f'''insert into {self.collection_item_const["table_name"]} values (?, ?, ?, ?)''', [
+                           (collection_id, i.item_id, i.item_type, i.amount) for i in items])
+        collection_items.extend(items)
+
+    def remove_items(self, items: 'list[Item]') -> None:
+        collection_id: 'str' = getattr(
+            self, self.collection_item_const['id_name'])
+        collection_items: 'list[Item]' = getattr(
+            self, self.collection_item_const['items_name'])
+
+        for i in items:
+            if i not in collection_items:
+                raise NoData(
+                    f'No such item `{i.item_type}`: `{i.item_id}` in {self.collection_item_const["name"]} `{collection_id}`', api_error_code=-124)
+        self.c.executemany(f'''delete from {self.collection_item_const["table_name"]} where {self.collection_item_const["table_primary_key"]}=? and item_id=? and type=?''', [
+                           (collection_id, i.item_id, i.item_type) for i in items])
+        for i in items:
+            collection_items.remove(i)
+
+    def update_items(self, items: 'list[Item]') -> None:
+        collection_id: 'str' = getattr(
+            self, self.collection_item_const['id_name'])
+        collection_items: 'list[Item]' = getattr(
+            self, self.collection_item_const['items_name'])
+
+        for i in items:
+            if i not in collection_items:
+                raise NoData(
+                    f'No such item `{i.item_type}`: `{i.item_id}` in {self.collection_item_const["name"]} `{collection_id}`', api_error_code=-124)
+        self.c.executemany(f'''update {self.collection_item_const["table_name"]} set amount=? where {self.collection_item_const["table_primary_key"]}=? and item_id=? and type=?''', [
+                           (i.amount, collection_id, i.item_id, i.item_type) for i in items])
+        for i in items:
+            collection_items[collection_items.index(i)].amount = i.amount
diff --git a/latest version/core/linkplay.py b/latest version/core/linkplay.py
index 0888915..a0a549f 100644
--- a/latest version/core/linkplay.py	
+++ b/latest version/core/linkplay.py	
@@ -103,9 +103,9 @@ def tcp(data: str) -> str:
             sock.sendall(bytes(data + "\n", "utf-8"))
             try:
                 received = str(sock.recv(1024), "utf-8").strip()
-            except socket.timeout:
+            except socket.timeout as e:
                 raise Timeout(
-                    'Timeout when waiting for data from link play server.', status=400)
+                    'Timeout when waiting for data from link play server.', status=400) from e
             # print(received)
             return received
 
diff --git a/latest version/core/operation.py b/latest version/core/operation.py
index c3813a4..830a4ef 100644
--- a/latest version/core/operation.py	
+++ b/latest version/core/operation.py	
@@ -53,8 +53,7 @@ def run(self):
                     where_values = []
                     for k in y:
                         ptt = Score.calculate_rating(defnum, k[1])
-                        if ptt < 0:
-                            ptt = 0
+                        ptt = max(ptt, 0)
                         values.append((ptt,))
                         where_values.append((k[0], i[0], j))
                     if values:
@@ -76,7 +75,7 @@ def run(self):
 
 class SaveUpdateScore(BaseOperation):
     '''
-        云存档更新成绩，是覆盖式更新\ 
+        云存档更新成绩，是覆盖式更新
         提供user参数时，只更新该用户的成绩，否则更新所有用户的成绩
     '''
     _name = 'save_update_score'
@@ -125,8 +124,7 @@ def _one_user_update(self):
                 if i['song_id'] in song_chart_const:
                     rating = Score.calculate_rating(
                         song_chart_const[i['song_id']][i['difficulty']] / 10, i['score'])
-                    if rating < 0:
-                        rating = 0
+                    rating = max(rating, 0)
 
                 y = f'{i["song_id"]}{i["difficulty"]}'
                 if y in clear_state:
@@ -143,7 +141,7 @@ def _one_user_update(self):
     def _all_update(self):
         with Connect() as c:
             c.execute(
-                f'''select song_id, rating_pst, rating_prs, rating_ftr, rating_byn from chart''')
+                '''select song_id, rating_pst, rating_prs, rating_ftr, rating_byn from chart''')
             song_chart_const = {i[0]: [i[1], i[2], i[3], i[4]]
                                 for i in c.fetchall()}  # chart const * 10
             c.execute('''select user_id from user_save''')
@@ -162,8 +160,7 @@ def _all_update(self):
                     if i['song_id'] in song_chart_const:
                         rating = Score.calculate_rating(
                             song_chart_const[i['song_id']][i['difficulty']] / 10, i['score'])
-                        if rating < 0:
-                            rating = 0
+                        rating = max(rating, 0)
 
                     y = f'{i["song_id"]}{i["difficulty"]}'
                     if y in clear_state:
@@ -180,7 +177,7 @@ def _all_update(self):
 
 class UnlockUserItem(BaseOperation):
     '''
-        全解锁/锁定用户物品\ 
+        全解锁/锁定用户物品
         提供user参数时，只更新该用户的，否则更新所有用户的
     '''
     _name = 'unlock_user_item'
@@ -198,7 +195,7 @@ def set_params(self, user_id: int = None, method: str = 'unlock', item_types: li
             self.user.user_id = int(user_id)
         if method in ['unlock', 'lock']:
             self.method = method
-        if isinstance(item_types, list) and all([i in self.ALLOW_TYPES for i in item_types]):
+        if isinstance(item_types, list) and all(i in self.ALLOW_TYPES for i in item_types):
             self.item_types = item_types
 
     def run(self):
diff --git a/latest version/core/present.py b/latest version/core/present.py
index 8ca67b2..5a680a7 100644
--- a/latest version/core/present.py	
+++ b/latest version/core/present.py	
@@ -1,10 +1,18 @@
 from time import time
 
-from .error import ArcError, DataExist, NoData
-from .item import ItemFactory
+from .error import ArcError, NoData
+from .item import CollectionItemMixin, ItemFactory
 
 
-class Present:
+class Present(CollectionItemMixin):
+    collection_item_const = {
+        'name': 'present',
+        'table_name': 'present_item',
+        'table_primary_key': 'present_id',
+        'id_name': 'present_id',
+        'items_name': 'items'
+    }
+
     def __init__(self, c=None) -> None:
         self.c = c
         self.present_id: str = None
@@ -109,47 +117,11 @@ def update(self) -> None:
         self.c.execute('''update present set expire_ts=?, description=? where present_id=?''',
                        (self.expire_ts, self.description, self.present_id))
 
-    def remove_items(self, items: list) -> None:
-        '''删除present_item表中的物品'''
-        for i in items:
-            if i not in self.items:
-                raise NoData(
-                    f'No such item `{i.item_type}`: `{i.item_id}` in present `{self.present_id}`', api_error_code=-124)
-        self.c.executemany('''delete from present_item where present_id=? and item_id=? and type=?''', [
-                           (self.present_id, i.item_id, i.item_type) for i in items])
-        for i in items:
-            self.items.remove(i)
-
-    def add_items(self, items: list) -> None:
-        '''添加物品到present_item表'''
-        for i in items:
-            if not i.select_exists():
-                raise NoData(
-                    f'No such item `{i.item_type}`: `{i.item_id}`', api_error_code=-121)
-            if i in self.items:
-                raise DataExist(
-                    f'Item `{i.item_type}`: `{i.item_id}` already exists in present `{self.present_id}`', api_error_code=-123)
-        self.c.executemany('''insert into present_item values(?,?,?,?)''', [
-                           (self.present_id, i.item_id, i.item_type, i.amount) for i in items])
-        self.items.extend(items)
-
-    def update_items(self, items: list) -> None:
-        '''更新present_item表中的物品'''
-        for i in items:
-            if i not in self.items:
-                raise NoData(
-                    f'No such item `{i.item_type}`: `{i.item_id}` in present `{self.present_id}`', api_error_code=-124)
-        self.c.executemany('''update present_item set amount=? where present_id=? and item_id=? and type=?''', [
-                           (i.amount, self.present_id, i.item_id, i.item_type) for i in items])
-
-        for i in items:
-            self.items[self.items.index(i)].amount = i.amount
-
 
 class UserPresent(Present):
     '''
-        用户登录奖励类\ 
-        忽视了description的多语言\ 
+        用户登录奖励类
+        忽视了description的多语言
         properties: `user` - `User`类或子类的实例
     '''
 
diff --git a/latest version/core/purchase.py b/latest version/core/purchase.py
index 546ce77..a3e5075 100644
--- a/latest version/core/purchase.py	
+++ b/latest version/core/purchase.py	
@@ -1,14 +1,21 @@
 from time import time
 
-from .error import DataExist, InputError, NoData, TicketNotEnough
-from .item import ItemFactory
+from .error import InputError, NoData, TicketNotEnough
+from .item import CollectionItemMixin, ItemFactory
 
 
-class Purchase:
+class Purchase(CollectionItemMixin):
     '''
-        购买类\ 
+        购买类
         properties: `user` - `User`类或子类的实例
     '''
+    collection_item_const = {
+        'name': 'purchase',
+        'table_name': 'purchase_item',
+        'table_primary_key': 'purchase_name',
+        'id_name': 'purchase_name',
+        'items_name': 'items'
+    }
 
     def __init__(self, c=None, user=None):
         self.c = c
@@ -212,45 +219,11 @@ def update(self) -> None:
         self.c.execute('''update purchase set price=:a, orig_price=:b, discount_from=:c, discount_to=:d, discount_reason=:e where purchase_name=:f''', {
                        'a': self.price, 'b': self.orig_price, 'c': self.discount_from, 'd': self.discount_to, 'e': self.discount_reason, 'f': self.purchase_name})
 
-    def add_items(self, items: list) -> None:
-        '''添加purchase_item表'''
-        for i in items:
-            if not i.select_exists():
-                raise NoData(
-                    f'No such item `{i.item_type}`: `{i.item_id}`', api_error_code=-121)
-            if i in self.items:
-                raise DataExist(
-                    f'Item `{i.item_type}`: `{i.item_id}` already exists in purchase `{self.purchase_name}`', api_error_code=-123)
-        self.c.executemany('''insert into purchase_item values (?, ?, ?, ?)''', [
-                           (self.purchase_name, i.item_id, i.item_type, i.amount) for i in items])
-        self.items.extend(items)
-
-    def remove_items(self, items: list) -> None:
-        '''删除purchase_item表'''
-        for i in items:
-            if i not in self.items:
-                raise NoData(
-                    f'No such item `{i.item_type}`: `{i.item_id}` in purchase `{self.purchase_name}`', api_error_code=-124)
-        self.c.executemany('''delete from purchase_item where purchase_name=? and item_id=? and type=?''', [
-                           (self.purchase_name, i.item_id, i.item_type) for i in items])
-        for i in items:
-            self.items.remove(i)
-
-    def update_items(self, items: list) -> None:
-        '''更新purchase_item表，只能更新amount'''
-        for i in items:
-            if i not in self.items:
-                raise NoData(
-                    f'No such item `{i.item_type}`: `{i.item_id}` in purchase `{self.purchase_name}`', api_error_code=-124)
-        self.c.executemany('''update purchase_item set amount=? where purchase_name=? and item_id=? and type=?''', [
-                           (i.amount, self.purchase_name, i.item_id, i.item_type) for i in items])
-        for i in items:
-            self.items[self.items.index(i)].amount = i.amount
-
 
 class PurchaseList:
     '''
-        购买列表类\ 
+        购买列表类
+
         property: `user` - `User`类或子类的实例
     '''
 
diff --git a/latest version/core/rank.py b/latest version/core/rank.py
index ced73a1..6dd030c 100644
--- a/latest version/core/rank.py	
+++ b/latest version/core/rank.py	
@@ -7,8 +7,9 @@
 
 class RankList:
     '''
-        排行榜类\ 
-        默认limit=20，limit<0认为是all\ 
+        排行榜类
+        默认limit=20，limit<0认为是all
+
         property: `user` - `User`类或者子类的实例
     '''
 
@@ -85,7 +86,8 @@ def select_friend(self, user=None, limit=Constant.MAX_FRIEND_COUNT) -> None:
     @staticmethod
     def get_my_rank_parameter(my_rank: int, amount: int, all_limit: int = 20, max_local_position: int = Constant.MY_RANK_MAX_LOCAL_POSITION, max_global_position: int = Constant.MY_RANK_MAX_GLOBAL_POSITION):
         '''
-            计算我的排名中的查询参数\ 
+            计算我的排名中的查询参数
+
             returns:
             `sql_limit`: int - 查询limit参数
             `sql_offset`: int - 查询offset参数
@@ -103,7 +105,7 @@ def get_my_rank_parameter(my_rank: int, amount: int, all_limit: int = 20, max_lo
             need_myself = True
         elif amount - my_rank < all_limit - max_local_position:  # 后方人数不足，显示排名
             sql_offset = amount - all_limit
-        elif my_rank >= max_local_position and my_rank <= max_global_position - all_limit + max_local_position - 1:  # 前方人数足够，显示排名
+        elif max_local_position <= my_rank <= max_global_position - all_limit + max_local_position - 1:  # 前方人数足够，显示排名
             sql_offset = my_rank - max_local_position
         else:  # 我已经忘了这是什么了
             sql_offset = max_global_position - all_limit
diff --git a/latest version/core/redeem.py b/latest version/core/redeem.py
index c958df4..4feef7c 100644
--- a/latest version/core/redeem.py	
+++ b/latest version/core/redeem.py	
@@ -1,8 +1,16 @@
-from .error import DataExist, NoData, RedeemUnavailable
-from .item import ItemFactory
+from .error import NoData, RedeemUnavailable
+from .item import CollectionItemMixin, ItemFactory
 
 
-class Redeem:
+class Redeem(CollectionItemMixin):
+    collection_item_const = {
+        'name': 'redeem',
+        'table_name': 'redeem_item',
+        'table_primary_key': 'code',
+        'id_name': 'code',
+        'items_name': 'items'
+    }
+
     def __init__(self, c=None) -> None:
         self.c = c
         self.code: str = None
@@ -87,46 +95,11 @@ def update(self) -> None:
         self.c.execute('''update redeem set type=? where code=?''',
                        (self.redeem_type, self.code))
 
-    def remove_items(self, items: list) -> None:
-        '''删除redeem_item表中的物品'''
-        for i in items:
-            if i not in self.items:
-                raise NoData(
-                    f'No such item `{i.item_type}`: `{i.item_id}` in redeem `{self.code}`', api_error_code=-124)
-        self.c.executemany('''delete from redeem_item where code=? and item_id=? and type=?''', [
-                           (self.code, i.item_id, i.item_type) for i in items])
-        for i in items:
-            self.items.remove(i)
-
-    def add_items(self, items: list) -> None:
-        '''添加物品到redeem_item表'''
-        for i in items:
-            if not i.select_exists():
-                raise NoData(
-                    f'No such item `{i.item_type}`: `{i.item_id}`', api_error_code=-121)
-            if i in self.items:
-                raise DataExist(
-                    f'Item `{i.item_type}`: `{i.item_id}` already exists in redeem `{self.code}`', api_error_code=-123)
-        self.c.executemany('''insert into redeem_item values(?,?,?,?)''', [
-                           (self.code, i.item_id, i.item_type, i.amount) for i in items])
-        self.items.extend(items)
-
-    def update_items(self, items: list) -> None:
-        '''更新redeem_item表中的物品'''
-        for i in items:
-            if i not in self.items:
-                raise NoData(
-                    f'No such item `{i.item_type}`: `{i.item_id}` in redeem `{self.code}`', api_error_code=-124)
-        self.c.executemany('''update redeem_item set amount=? where code=? and item_id=? and type=?''', [
-                           (i.amount, self.code, i.item_id, i.item_type) for i in items])
-
-        for i in items:
-            self.items[self.items.index(i)].amount = i.amount
-
 
 class UserRedeem(Redeem):
     '''
-        用户兑换码类\ 
+        用户兑换码类
+
         properties: `user` - `User`类或子类的实例
     '''
 
@@ -165,7 +138,7 @@ def claim_user_redeem(self, code: str = None) -> None:
             if self.redeem_type == 0:
                 raise RedeemUnavailable(
                     'The redeem `%s` is unavailable.' % self.code)
-            elif self.redeem_type == 1:
+            if self.redeem_type == 1:
                 raise RedeemUnavailable(
                     'The redeem `%s` is unavailable.' % self.code, 506)
 
diff --git a/latest version/core/save.py b/latest version/core/save.py
index bd6cccf..16cd7d4 100644
--- a/latest version/core/save.py	
+++ b/latest version/core/save.py	
@@ -11,6 +11,8 @@ class SaveData:
 
     def __init__(self, c=None) -> None:
         self.c = c
+        self.user = None
+
         self.scores_data = []
         self.clearlamps_data = []
         self.clearedsongs_data = []
@@ -127,7 +129,7 @@ def set_value(self, key: str, value: str, checksum: str) -> None:
                 'Property `%s` is not found in the instance of `SaveData` class.' % key)
 
         if md5(value) == checksum:
-            if key == 'installid_data' or key == 'devicemodelname_data' or key == 'finalestate_data':
+            if key in ('installid_data', 'devicemodelname_data', 'finalestate_data'):
                 self.__dict__[key] = json.loads(value)['val']
             else:
                 self.__dict__[key] = json.loads(value)['']
diff --git a/latest version/core/score.py b/latest version/core/score.py
index 8d4cbfd..0c68f47 100644
--- a/latest version/core/score.py	
+++ b/latest version/core/score.py	
@@ -14,6 +14,8 @@
 
 class Score:
     def __init__(self) -> None:
+        self.c = None
+
         self.song: 'Chart' = Chart()
         self.score: int = None
         self.shiny_perfect_count: int = None
@@ -45,18 +47,17 @@ def get_song_grade(score: int) -> int:
         '''分数转换为评级'''
         if score >= 9900000:  # EX+
             return 6
-        elif 9800000 <= score < 9900000:  # EX
+        if score >= 9800000:  # EX
             return 5
-        elif 9500000 <= score < 9800000:  # AA
+        if score >= 9500000:  # AA
             return 4
-        elif 9200000 <= score < 9500000:  # A
+        if score >= 9200000:  # A
             return 3
-        elif 8900000 <= score < 9200000:  # B
+        if score >= 8900000:  # B
             return 2
-        elif 8600000 <= score < 8900000:  # C
+        if score >= 8600000:  # C
             return 1
-        else:
-            return 0
+        return 0
 
     @property
     def song_grade(self) -> int:
@@ -67,21 +68,24 @@ def get_song_state(clear_type: int) -> int:
         '''clear_type转换为成绩状态，用数字大小标识便于比较'''
         if clear_type == 3:  # PM
             return 5
-        elif clear_type == 2:  # FC
+        if clear_type == 2:  # FC
             return 4
-        elif clear_type == 5:  # Hard Clear
+        if clear_type == 5:  # Hard Clear
             return 3
-        elif clear_type == 1:  # Clear
+        if clear_type == 1:  # Clear
             return 2
-        elif clear_type == 4:  # Easy Clear
+        if clear_type == 4:  # Easy Clear
             return 1
-        else:  # Track Lost
-            return 0
+        return 0  # Track Lost
 
     @property
     def song_state(self) -> int:
         return self.get_song_state(self.clear_type)
 
+    @property
+    def all_note_count(self) -> int:
+        return self.perfect_count + self.near_count + self.miss_count
+
     @property
     def is_valid(self) -> bool:
         '''分数有效性检查'''
@@ -90,7 +94,7 @@ def is_valid(self) -> bool:
         if self.song.difficulty not in (0, 1, 2, 3):
             return False
 
-        all_note = self.perfect_count + self.near_count + self.miss_count
+        all_note = self.all_note_count
         if all_note == 0:
             return False
 
@@ -112,8 +116,7 @@ def calculate_rating(defnum: float, score: int) -> float:
             ptt = defnum + 2
         elif score < 9800000:
             ptt = defnum + (score-9500000) / 300000
-            if ptt < 0:
-                ptt = 0
+            ptt = max(ptt, 0)
         else:
             ptt = defnum + 1 + (score-9800000) / 200000
 
@@ -217,7 +220,10 @@ def __init__(self, c=None, user=None) -> None:
         self.course_play_state: int = None
         self.course_play: 'CoursePlay' = None
 
+        self.combo_interval_bonus: int = None  # 不能给 None 以外的默认值
+
     def to_dict(self) -> dict:
+        # 不能super
         if self.is_world_mode is None or self.course_play_state is None:
             return {}
         if self.course_play_state == 4:
@@ -249,10 +255,15 @@ def is_valid(self) -> bool:
         if songfile_hash and songfile_hash != self.song_hash:
             return False
 
-        x = self.song_token + self.song_hash + self.song.song_id + str(self.song.difficulty) + str(self.score) + str(self.shiny_perfect_count) + str(
-            self.perfect_count) + str(self.near_count) + str(self.miss_count) + str(self.health) + str(self.modifier) + str(self.clear_type)
-        y = str(self.user.user_id) + self.song_hash
+        x = f'''{self.song_token}{self.song_hash}{self.song.song_id}{self.song.difficulty}{self.score}{self.shiny_perfect_count}{self.perfect_count}{self.near_count}{self.miss_count}{self.health}{self.modifier}{self.clear_type}'''
+        if self.combo_interval_bonus is not None:
+            if self.combo_interval_bonus < 0 or self.combo_interval_bonus > self.all_note_count / 150:
+                return False
+            x = x + str(self.combo_interval_bonus)
+
+        y = f'{self.user.user_id}{self.song_hash}'
         checksum = md5(x+md5(y))
+
         if checksum != self.submission_hash:
             return False
 
@@ -302,7 +313,7 @@ def set_play_state_for_world(self, stamina_multiply: int = 1, fragment_multiply:
             x = self.c.fetchone()
             if x:
                 self.prog_boost_multiply = 300 if x[0] == 300 else 0
-                if x[1] < self.beyond_boost_gauge_usage or (self.beyond_boost_gauge_usage != 100 and self.beyond_boost_gauge_usage != 200):
+                if x[1] < self.beyond_boost_gauge_usage or self.beyond_boost_gauge_usage not in (100, 200):
                     # 注意：偷懒了，没判断是否是beyond图
                     self.beyond_boost_gauge_usage = 0
 
@@ -374,8 +385,8 @@ def update_recent30(self) -> None:
         '''更新此分数对应用户的recent30'''
         old_recent_10 = self.ptt.recent_10
         if self.is_protected:
-            old_r30 = [x for x in self.ptt.r30]
-            old_s30 = [x for x in self.ptt.s30]
+            old_r30 = self.ptt.r30.copy()
+            old_s30 = self.ptt.s30.copy()
 
         # 寻找pop位置
         songs = list(set(self.ptt.s30))
@@ -479,7 +490,8 @@ def upload_score(self) -> None:
 
 class Potential:
     '''
-        用户潜力值计算处理类\ 
+        用户潜力值计算处理类
+
         property: `user` - `User`类或子类的实例
     '''
 
@@ -487,8 +499,8 @@ def __init__(self, c=None, user=None):
         self.c = c
         self.user = user
 
-        self.r30: list = None
-        self.s30: list = None
+        self.r30: 'list[float]' = None
+        self.s30: 'list[str]' = None
         self.songs_selected: list = None
 
         self.b30: list = None
@@ -503,7 +515,7 @@ def best_30(self) -> float:
         '''获取用户best30的总潜力值'''
         self.c.execute('''select rating from best_score where user_id = :a order by rating DESC limit 30''', {
             'a': self.user.user_id})
-        return sum([x[0] for x in self.c.fetchall()])
+        return sum(x[0] for x in self.c.fetchall())
 
     def select_recent_30(self) -> None:
         '''获取用户recent30数据'''
@@ -578,7 +590,8 @@ def insert_recent_30(self) -> None:
 
 class UserScoreList:
     '''
-        用户分数查询类\ 
+        用户分数查询类
+
         properties: `user` - `User`类或子类的实例
     '''
 
diff --git a/latest version/core/song.py b/latest version/core/song.py
index bea9d9d..2b391ea 100644
--- a/latest version/core/song.py	
+++ b/latest version/core/song.py	
@@ -7,6 +7,8 @@ class Chart:
 
     def __init__(self, c=None, song_id: str = None, difficulty: int = None) -> None:
         self.c = c
+        self.song_id: str = None
+        self.difficulty: int = None
         self.set_chart(song_id, difficulty)
         self.defnum: int = None
         self.song_name: str = None
diff --git a/latest version/core/sql.py b/latest version/core/sql.py
index 693cc6c..66f31b0 100644
--- a/latest version/core/sql.py	
+++ b/latest version/core/sql.py	
@@ -12,8 +12,8 @@ class Connect:
 
     def __init__(self, file_path: str = Constant.SQLITE_DATABASE_PATH, in_memory: bool = False, logger=None) -> None:
         """
-            数据库连接，默认连接arcaea_database.db\ 
-            接受：文件路径\ 
+            数据库连接，默认连接arcaea_database.db
+            接受：文件路径
             返回：sqlite3连接操作对象
         """
         self.file_path = file_path
@@ -21,6 +21,9 @@ def __init__(self, file_path: str = Constant.SQLITE_DATABASE_PATH, in_memory: bo
         if logger is not None:
             self.logger = logger
 
+        self.conn: sqlite3.Connection = None
+        self.c: sqlite3.Cursor = None
+
     def __enter__(self) -> sqlite3.Cursor:
         if self.in_memory:
             self.conn = sqlite3.connect(
@@ -144,19 +147,19 @@ def sort(self, sort: list) -> None:
                         raise InputError(api_error_code=-104)
         self.__sort = sort
 
-    def set_value(self, limit=-1, offset=0, query={}, fuzzy_query={}, sort=[]) -> None:
+    def set_value(self, limit=-1, offset=0, query=None, fuzzy_query=None, sort=None) -> None:
         self.limit = limit
         self.offset = offset
-        self.query = query
-        self.fuzzy_query = fuzzy_query
-        self.sort = sort
+        self.query = query if query is not None else {}
+        self.fuzzy_query = fuzzy_query if fuzzy_query is not None else {}
+        self.sort = sort if sort is not None else []
 
     def from_dict(self, d: dict) -> 'Query':
         self.set_value(d.get('limit', -1), d.get('offset', 0),
                        d.get('query', {}), d.get('fuzzy_query', {}), d.get('sort', []))
         return self
 
-    def from_args(self, query: dict, limit: int = -1, offset: int = 0, sort: list = [], fuzzy_query: dict = {}) -> 'Query':
+    def from_args(self, query: dict, limit: int = -1, offset: int = 0, sort: list = None, fuzzy_query: dict = None) -> 'Query':
         self.set_value(limit, offset, query, fuzzy_query, sort)
         return self
 
@@ -170,7 +173,7 @@ def __init__(self, c=None) -> None:
         self.c = c
 
     @staticmethod
-    def get_select_sql(table_name: str, target_column: list = [], query: 'Query' = None):
+    def get_select_sql(table_name: str, target_column: list = None, query: 'Query' = None):
         '''拼接单表内行查询单句sql语句，返回语句和参数列表'''
         sql_list = []
         if not target_column:
@@ -210,8 +213,10 @@ def get_select_sql(table_name: str, target_column: list = [], query: 'Query' = N
         return sql, sql_list
 
     @staticmethod
-    def get_insert_sql(table_name: str, key: list = [], value_len: int = None, insert_type: str = None) -> str:
+    def get_insert_sql(table_name: str, key: list = None, value_len: int = None, insert_type: str = None) -> str:
         '''拼接insert语句，请注意只返回sql语句，insert_type为replace或ignore'''
+        if key is None:
+            key = []
         insert_type = 'replace' if insert_type in [
             'replace', 'R', 'r', 'REPLACE'] else 'ignore'
         return ('insert into ' if insert_type is None else 'insert or ' + insert_type + ' into ') + table_name + ('(' + ','.join(key) + ')' if key else '') + ' values(' + ','.join(['?'] * (len(key) if value_len is None else value_len)) + ')'
@@ -281,13 +286,13 @@ def get_delete_sql(table_name: str, query: 'Query' = None):
 
         return sql, sql_list
 
-    def select(self, table_name: str, target_column: list = [], query: 'Query' = None) -> list:
+    def select(self, table_name: str, target_column: list = None, query: 'Query' = None) -> list:
         '''单表内行select单句sql语句，返回fetchall数据'''
         sql, sql_list = self.get_select_sql(table_name, target_column, query)
         self.c.execute(sql, sql_list)
         return self.c.fetchall()
 
-    def select_exists(self, table_name: str, target_column: list = [], query: 'Query' = None) -> bool:
+    def select_exists(self, table_name: str, target_column: list = None, query: 'Query' = None) -> bool:
         '''单表内行select exists单句sql语句，返回bool值'''
         sql, sql_list = self.get_select_sql(table_name, target_column, query)
         self.c.execute('select exists(' + sql + ')', sql_list)
@@ -329,7 +334,7 @@ def get_table_info(self, table_name: str):
         pk = []
         name = []
 
-        self.c.execute('''pragma table_info ("%s")''' % table_name)  # 这里无法参数化
+        self.c.execute(f'''pragma table_info ("{table_name}")''')  # 这里无法参数化
         x = self.c.fetchall()
         if x:
             for i in x:
@@ -390,8 +395,8 @@ def update_database(self) -> None:
         '''
         with Connect(self.c2_path) as c2:
             with Connect(self.c1_path) as c1:
-                [self.update_one_table(c1, c2, i)
-                 for i in Constant.DATABASE_MIGRATE_TABLES]
+                for i in Constant.DATABASE_MIGRATE_TABLES:
+                    self.update_one_table(c1, c2, i)
 
                 if not Constant.UPDATE_WITH_NEW_CHARACTER_DATA:
                     self.update_one_table(c1, c2, 'character')
@@ -406,7 +411,7 @@ def __init__(self):
         self.c = self.conn.cursor()
         self.c.execute('''PRAGMA journal_mode = OFF''')
         self.c.execute('''PRAGMA synchronous = 0''')
-        self.c.execute('''create table if not exists download_token(user_id int, 
+        self.c.execute('''create table if not exists download_token(user_id int,
         song_id text,file_name text,token text,time int,primary key(user_id, song_id, file_name));''')
         self.c.execute(
             '''create index if not exists download_token_1 on download_token (song_id, file_name);''')
diff --git a/latest version/core/system.py b/latest version/core/system.py
index dd20c33..f7d68c3 100644
--- a/latest version/core/system.py	
+++ b/latest version/core/system.py	
@@ -13,7 +13,7 @@ def to_dict(self) -> dict:
             "stamina_recover_tick": Constant.STAMINA_RECOVER_TICK,
             "core_exp": Constant.CORE_EXP,
             "curr_ts": int(time()*1000),
-            "level_steps": [{'level': i, 'level_exp': Constant.LEVEL_STEPS[i]} for i in Constant.LEVEL_STEPS],
+            "level_steps": [{'level': k, 'level_exp': v} for k, v in Constant.LEVEL_STEPS.items()],
             "world_ranking_enabled": True,
             "is_byd_chapter_unlocked": True
         }
diff --git a/latest version/core/user.py b/latest version/core/user.py
index b25bf12..2718369 100644
--- a/latest version/core/user.py	
+++ b/latest version/core/user.py	
@@ -2,6 +2,7 @@
 import hashlib
 import time
 from os import urandom
+from random import randint
 
 from .character import UserCharacter, UserCharacterList
 from .config_manager import Config
@@ -100,7 +101,6 @@ def set_user_code(self, user_code: str) -> None:
 
     def _build_user_code(self):
         # 生成9位的user_code，用的自然是随机
-        from random import randint
         random_times = 0
 
         while random_times <= 1000:
@@ -148,7 +148,7 @@ def register(self):
             self._build_user_id()
         self._insert_user_char()
 
-        self.c.execute('''insert into user(user_id, name, password, join_date, user_code, rating_ptt, 
+        self.c.execute('''insert into user(user_id, name, password, join_date, user_code, rating_ptt,
         character_id, is_skill_sealed, is_char_uncapped, is_char_uncapped_override, is_hide_rating, favorite_character, max_stamina_notification_enabled, current_map, ticket, prog_boost, email)
         values(:user_id, :name, :password, :join_date, :user_code, 0, 0, 0, 0, 0, 0, -1, 0, '', :memories, 0, :email)
         ''', {'user_code': self.user_code, 'user_id': self.user_id, 'join_date': now, 'name': self.name, 'password': self.hash_pwd, 'memories': Config.DEFAULT_MEMORIES, 'email': self.email})
@@ -309,6 +309,8 @@ def __init__(self, c, user_id=None) -> None:
         self.beyond_boost_gauge: float = 0
         self.next_fragstam_ts: int = None
         self.world_mode_locked_end_ts: int = None
+        self.current_map: 'Map' = None
+        self.stamina: 'UserStamina' = None
 
         self.__cores: list = None
         self.__packs: list = None
@@ -406,7 +408,7 @@ def friends(self) -> list:
                 self.c.execute('''select exists(select * from friend where user_id_me = :x and user_id_other = :y)''',
                                {'x': i[0], 'y': self.user_id})
 
-                is_mutual = True if self.c.fetchone() == (1,) else False
+                is_mutual = self.c.fetchone() == (1,)
 
                 you = UserOnline(self.c, i[0])
                 you.select_user()
@@ -626,7 +628,7 @@ def select_user_about_world_play(self) -> None:
         self.character.is_uncapped_override = x[5] == 1
         self.current_map = UserMap(self.c, x[6], self)
         self.world_mode_locked_end_ts = x[7] if x[7] else -1
-        self.beyond_boost_gauge = x[8] if x[8] else 0 
+        self.beyond_boost_gauge = x[8] if x[8] else 0
 
     @property
     def global_rank(self) -> int:
@@ -660,16 +662,16 @@ def update_global_rank(self) -> None:
 
         score_sum = 0
         if len(song_list_ftr) >= 2:
-            self.c.execute('''select sum(score) from best_score where user_id=? and difficulty=2 and song_id in ({0})'''.format(
-                ','.join(['?']*(len(song_list_ftr)-1))), tuple(song_list_ftr))
+            self.c.execute(
+                f'''select sum(score) from best_score where user_id=? and difficulty=2 and song_id in ({','.join(['?']*(len(song_list_ftr)-1))})''', tuple(song_list_ftr))
 
             x = self.c.fetchone()
             if x[0] is not None:
                 score_sum += x[0]
 
         if len(song_list_byn) >= 2:
-            self.c.execute('''select sum(score) from best_score where user_id=? and difficulty=3 and song_id in ({0})'''.format(
-                ','.join(['?']*(len(song_list_byn)-1))), tuple(song_list_byn))
+            self.c.execute(
+                f'''select sum(score) from best_score where user_id=? and difficulty=3 and song_id in ({','.join(['?']*(len(song_list_byn)-1))})''', tuple(song_list_byn))
 
             x = self.c.fetchone()
             if x[0] is not None:
@@ -682,13 +684,13 @@ def update_global_rank(self) -> None:
 
     def select_user_one_column(self, column_name: str, default_value=None) -> None:
         '''
-            查询user表的某个属性\ 
+            查询user表的某个属性
             请注意必须是一个普通属性，不能是一个类的实例
         '''
         if column_name not in self.__dict__:
             raise InputError('No such column.')
-        self.c.execute('''select %s from user where user_id = :a''' %
-                       column_name, {'a': self.user_id})
+        self.c.execute(f'''select {column_name} from user where user_id = :a''', {
+                       'a': self.user_id})
         x = self.c.fetchone()
         if not x:
             raise NoData('No user.', 108, -3)
@@ -697,15 +699,15 @@ def select_user_one_column(self, column_name: str, default_value=None) -> None:
 
     def update_user_one_column(self, column_name: str, value=None) -> None:
         '''
-            更新user表的某个属性\ 
+            更新user表的某个属性
             请注意必须是一个普通属性，不能是一个类的实例
         '''
         if column_name not in self.__dict__:
             raise InputError('No such column.')
         if value is not None:
             self.__dict__[column_name] = value
-        self.c.execute('''update user set %s = :a where user_id = :b''' %
-                       column_name, {'a': self.__dict__[column_name], 'b': self.user_id})
+        self.c.execute(f'''update user set {column_name} = :a where user_id = :b''', {
+                       'a': self.__dict__[column_name], 'b': self.user_id})
 
 
 class UserOnline(UserInfo):
diff --git a/latest version/core/world.py b/latest version/core/world.py
index 7f37c29..6f19eac 100644
--- a/latest version/core/world.py	
+++ b/latest version/core/world.py	
@@ -1,6 +1,6 @@
-import json
 import os
 from functools import lru_cache
+from json import load
 from random import random
 from time import time
 
@@ -25,15 +25,15 @@ def get_world_name(file_dir: str = Constant.WORLD_MAP_FOLDER_PATH) -> list:
 def get_world_info(map_id: str) -> dict:
     '''读取json文件内容，返回字典'''
     world_info = {}
-    with open(os.path.join(Constant.WORLD_MAP_FOLDER_PATH, map_id+'.json'), 'r') as f:
-        world_info = json.load(f)
+    with open(os.path.join(Constant.WORLD_MAP_FOLDER_PATH, f'{map_id}.json'), 'rb') as f:
+        world_info = load(f)
 
     return world_info
 
 
 def get_world_all(c, user) -> list:
     '''
-        读取所有地图信息，返回列表\ 
+        读取所有地图信息，返回列表
         parameter: `user` - `User`类或子类的实例
     '''
     worlds = get_world_name()
@@ -44,7 +44,7 @@ class Step:
     '''台阶类'''
 
     def __init__(self) -> None:
-        self.postion: int = None
+        self.position: int = None
         self.capture: int = None
         self.items: list = []
         self.restrict_id: str = None
@@ -198,7 +198,7 @@ def select_map_info(self):
 
 class UserMap(Map):
     '''
-        用户地图类\ 
+        用户地图类
         parameters: `user` - `User`类或者子类的实例
     '''
 
@@ -413,7 +413,8 @@ def stamina(self, value: int) -> None:
 
 class UserStamina(Stamina):
     '''
-        用户体力类\ 
+        用户体力类
+
         parameter: `user` - `User`类或子类的实例
     '''
 
@@ -439,8 +440,9 @@ def update(self):
 
 class WorldPlay:
     '''
-        世界模式打歌类，处理特殊角色技能，联动UserMap和UserPlay\ 
-        parameter: `user` - `UserOnline`类或子类的实例\ 
+        世界模式打歌类，处理特殊角色技能，联动UserMap和UserPlay
+
+        parameter: `user` - `UserOnline`类或子类的实例
         'user_play` - `UserPlay`类的实例
     '''
 
@@ -598,8 +600,8 @@ def update(self) -> None:
         if self.user_play.beyond_gauge == 0:
             # 更新byd大招蓄力条
             self.user.beyond_boost_gauge += self.beyond_boost_gauge_addition
-            if self.user.beyond_boost_gauge > 200:
-                self.user.beyond_boost_gauge = 200
+            self.user.beyond_boost_gauge = min(
+                self.user.beyond_boost_gauge, 200)
             self.user.update_user_one_column(
                 'beyond_boost_gauge', self.user.beyond_boost_gauge)
         elif self.user_play.beyond_boost_gauge_usage != 0 and self.user_play.beyond_boost_gauge_usage <= self.user.beyond_boost_gauge:
@@ -656,6 +658,8 @@ def before_calculate(self) -> None:
                 self._special_tempest()
             elif self.character_used.skill_id_displayed == 'ilith_awakened_skill':
                 self._ilith_awakened_skill()
+            elif self.character_used.skill_id_displayed == 'skill_mithra':
+                self._skill_mithra()
         else:
             if self.character_used.skill_id_displayed == 'skill_vita':
                 self._skill_vita()
@@ -684,7 +688,7 @@ def _special_tempest(self) -> None:
 
     def _skill_vita(self) -> None:
         '''
-            vita技能，overdrive随回忆率提升，提升量最多为10\ 
+            vita技能，overdrive随回忆率提升，提升量最多为10
             此处采用线性函数
         '''
         self.over_skill_increase = 0
@@ -745,7 +749,7 @@ def _skill_amane(self) -> None:
         '''
         x: 'Step' = self.user.current_map.steps_for_climbing[0]
         if ('randomsong' in x.step_type or 'speedlimit' in x.step_type) and self.user_play.song_grade < 5:
-            self.character_bonus_progress = -self.step_value / 2 / self.step_times
+            self.character_bonus_progress = -1 * self.step_value / 2 / self.step_times
             self.step_value = self.step_value / 2
             self.user.current_map.reclimb(self.step_value)
 
@@ -765,3 +769,10 @@ def _skill_mika(self) -> None:
                 self.character_used.level)
             self.prog_skill_increase = self.character_used.prog.get_value(
                 self.character_used.level)
+
+    def _skill_mithra(self) -> None:
+        '''
+        mithra 技能，每 150 combo 增加世界模式进度+1，直接理解成 prog 值增加
+        '''
+        if self.user_play.combo_interval_bonus:
+            self.prog_skill_increase = self.user_play.combo_interval_bonus
diff --git a/latest version/database/init/arc_data.py b/latest version/database/init/arc_data.py
index 03a2578..c0a0d31 100644
--- a/latest version/database/init/arc_data.py	
+++ b/latest version/database/init/arc_data.py	
@@ -1,45 +1,45 @@
 class InitData:
     char = ['hikari', 'tairitsu', 'kou', 'sapphire', 'lethe', 'hikari&tairitsu(reunion)', 'Tairitsu(Axium)', 'Tairitsu(Grievous Lady)', 'stella', 'Hikari & Fisica', 'ilith', 'eto', 'luna', 'shirabe', 'Hikari(Zero)', 'Hikari(Fracture)', 'Hikari(Summer)', 'Tairitsu(Summer)', 'Tairitsu & Trin',
-            'ayu', 'Eto & Luna', 'yume', 'Seine & Hikari', 'saya', 'Tairitsu & Chuni Penguin', 'Chuni Penguin', 'haruna', 'nono', 'MTA-XXX', 'MDA-21', 'kanae', 'Hikari(Fantasia)', 'Tairitsu(Sonata)', 'sia', 'DORO*C', 'Tairitsu(Tempest)', 'brillante', 'Ilith(Summer)', 'etude', 'Alice & Tenniel', 'Luna & Mia', 'areus', 'seele', 'isabelle', 'mir', 'lagrange', 'linka', 'nami', 'Saya & Elizabeth', 'lily', 'kanae(midsummer)', 'alice&tenniel(minuet)', 'tairitsu(elegy)', 'marija', 'vita', 'hikari(fatalis)', 'saki', 'setsuna', 'amane', 'kou(winter)', 'lagrange(aria)', 'lethe(apophenia)', 'shama(UNiVERSE)', 'milk(UNiVERSE)', 'shikoku', 'mika yurisaki']
+            'ayu', 'Eto & Luna', 'yume', 'Seine & Hikari', 'saya', 'Tairitsu & Chuni Penguin', 'Chuni Penguin', 'haruna', 'nono', 'MTA-XXX', 'MDA-21', 'kanae', 'Hikari(Fantasia)', 'Tairitsu(Sonata)', 'sia', 'DORO*C', 'Tairitsu(Tempest)', 'brillante', 'Ilith(Summer)', 'etude', 'Alice & Tenniel', 'Luna & Mia', 'areus', 'seele', 'isabelle', 'mir', 'lagrange', 'linka', 'nami', 'Saya & Elizabeth', 'lily', 'kanae(midsummer)', 'alice&tenniel(minuet)', 'tairitsu(elegy)', 'marija', 'vita', 'hikari(fatalis)', 'saki', 'setsuna', 'amane', 'kou(winter)', 'lagrange(aria)', 'lethe(apophenia)', 'shama(UNiVERSE)', 'milk(UNiVERSE)', 'shikoku', 'mika yurisaki', 'Mithra Tercera', 'Toa Kozukata']
 
     skill_id = ['gauge_easy', '', '', '', 'note_mirror', 'skill_reunion', '', 'gauge_hard', 'frag_plus_10_pack_stellights', 'gauge_easy|frag_plus_15_pst&prs', 'gauge_hard|fail_frag_minus_100', 'frag_plus_5_side_light', 'visual_hide_hp', 'frag_plus_5_side_conflict', 'challenge_fullcombo_0gauge', 'gauge_overflow', 'gauge_easy|note_mirror', 'note_mirror', 'visual_tomato_pack_tonesphere',
-                'frag_rng_ayu', 'gaugestart_30|gaugegain_70', 'combo_100-frag_1', 'audio_gcemptyhit_pack_groovecoaster', 'gauge_saya', 'gauge_chuni', 'kantandeshou', 'gauge_haruna', 'frags_nono', 'gauge_pandora', 'gauge_regulus', 'omatsuri_daynight', '', '', 'sometimes(note_mirror|frag_plus_5)', 'scoreclear_aa|visual_scoregauge', 'gauge_tempest', 'gauge_hard', 'gauge_ilith_summer', '', 'note_mirror|visual_hide_far', 'frags_ongeki', 'gauge_areus', 'gauge_seele', 'gauge_isabelle', 'gauge_exhaustion', 'skill_lagrange', 'gauge_safe_10', 'frags_nami', 'skill_elizabeth', 'skill_lily', 'skill_kanae_midsummer', '', '', 'visual_ghost_skynotes', 'skill_vita', 'skill_fatalis', 'frags_ongeki_slash', 'frags_ongeki_hard', 'skill_amane', 'skill_kou_winter', '', 'gauge_hard|note_mirror', 'skill_shama', 'skill_milk', 'skill_shikoku', 'skill_mika']
+                'frag_rng_ayu', 'gaugestart_30|gaugegain_70', 'combo_100-frag_1', 'audio_gcemptyhit_pack_groovecoaster', 'gauge_saya', 'gauge_chuni', 'kantandeshou', 'gauge_haruna', 'frags_nono', 'gauge_pandora', 'gauge_regulus', 'omatsuri_daynight', '', '', 'sometimes(note_mirror|frag_plus_5)', 'scoreclear_aa|visual_scoregauge', 'gauge_tempest', 'gauge_hard', 'gauge_ilith_summer', '', 'note_mirror|visual_hide_far', 'frags_ongeki', 'gauge_areus', 'gauge_seele', 'gauge_isabelle', 'gauge_exhaustion', 'skill_lagrange', 'gauge_safe_10', 'frags_nami', 'skill_elizabeth', 'skill_lily', 'skill_kanae_midsummer', '', '', 'visual_ghost_skynotes', 'skill_vita', 'skill_fatalis', 'frags_ongeki_slash', 'frags_ongeki_hard', 'skill_amane', 'skill_kou_winter', '', 'gauge_hard|note_mirror', 'skill_shama', 'skill_milk', 'skill_shikoku', 'skill_mika', 'skill_mithra', 'skill_toa']
 
     skill_id_uncap = ['', '', 'frags_kou', '', 'visual_ink', '', '', '', '', '', 'ilith_awakened_skill', 'eto_uncap', 'luna_uncap', 'shirabe_entry_fee',
-                      '', '', '', '', '', 'ayu_uncap', '', 'frags_yume', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '']
+                      '', '', '', '', '', 'ayu_uncap', '', 'frags_yume', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '']
 
     skill_unlock_level = [0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 0, 0, 0, 0, 0,
-                          0, 0, 0, 8, 0, 14, 0, 0, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+                          0, 0, 0, 8, 0, 14, 0, 0, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
 
     frag1 = [55, 55, 60, 50, 47, 79, 47, 57, 41, 22, 50, 54, 60, 56, 78, 42, 41, 61, 52, 50, 52, 32,
-             42, 55, 45, 58, 43, 0.5, 68, 50, 62, 45, 45, 52, 44, 27, 59, 0, 45, 50, 50, 47, 47, 61, 43, 42, 38, 25, 58, 50, 61, 45, 45, 38, 34, 27, 18, 56, 47, 30, 45, 57, 55.5, 47, 33, 26]
+             42, 55, 45, 58, 43, 0.5, 68, 50, 62, 45, 45, 52, 44, 27, 59, 0, 45, 50, 50, 47, 47, 61, 43, 42, 38, 25, 58, 50, 61, 45, 45, 38, 34, 27, 18, 56, 47, 30, 45, 57, 56, 47, 33, 26, 29, 66]
 
     prog1 = [35, 55, 47, 50, 60, 70, 60, 70, 58, 45, 70, 45, 42, 46, 61, 67, 49, 44, 28, 45, 24, 46, 52,
-             59, 62, 33, 58, 25, 63, 69, 50, 45, 45, 51, 34, 70, 62, 70, 45, 32, 32, 61, 47, 47, 37, 42, 50, 50, 45, 41, 61, 45, 45, 58, 50, 130, 18, 57, 55, 50, 45, 70, 37.5, 29, 44, 26]
+             59, 62, 33, 58, 25, 63, 69, 50, 45, 45, 51, 34, 70, 62, 70, 45, 32, 32, 61, 47, 47, 37, 42, 50, 50, 45, 41, 61, 45, 45, 58, 50, 130, 18, 57, 55, 50, 45, 70, 37.5, 29, 44, 26, 26, 35]
 
     overdrive1 = [35, 55, 25, 50, 47, 70, 72, 57, 41, 7, 10, 32, 65, 31, 61, 53, 31, 47, 38, 12, 39, 18,
-                  48, 65, 45, 55, 44, 25, 46, 44, 33, 45, 45, 37, 25, 27, 50, 20, 45, 63, 21, 47, 61, 47, 65, 80, 38, 30, 49, 15, 34, 45, 45, 38, 67, 120, 44, 33, 55, 50, 45, 57, 31, 29, 65, 26]
+                  48, 65, 45, 55, 44, 25, 46, 44, 33, 45, 45, 37, 25, 27, 50, 20, 45, 63, 21, 47, 61, 47, 65, 80, 38, 30, 49, 15, 34, 45, 45, 38, 67, 120, 44, 33, 55, 50, 45, 57, 31, 29, 65, 26, 29, 42.5]
 
     frag20 = [78, 80, 90, 75, 70, 79, 70, 79, 65, 40, 50, 80, 90, 82, 0, 61, 67, 92, 85, 50, 86, 52,
-              65, 85, 67, 88, 64, 0.5, 95, 70, 95, 50, 80, 87, 71, 50, 85, 0, 80, 75, 50, 70, 70, 90, 65, 80, 61, 50, 68, 60, 90, 67, 50, 60, 51, 50, 35, 85, 47, 50, 75, 80, 89.5, 50, 50, 51]
+              65, 85, 67, 88, 64, 0.5, 95, 70, 95, 50, 80, 87, 71, 50, 85, 0, 80, 75, 50, 70, 70, 90, 65, 80, 61, 50, 68, 60, 90, 67, 50, 60, 51, 50, 35, 85, 47, 50, 75, 80, 90, 80, 50, 51, 54, 100]
 
     prog20 = [61, 80, 70, 75, 90, 70, 90, 102, 84, 78, 105, 67, 63, 68, 0, 99, 80, 66, 46, 83, 40, 73,
-              80, 90, 93, 50, 86, 78, 89, 98, 75, 80, 50, 64, 55, 100, 90, 110, 80, 50, 74, 90, 70, 70, 56, 80, 79, 55, 65, 59, 90, 50, 90, 90, 75, 210, 35, 86, 92, 80, 75, 100, 60, 50, 68, 51]
+              80, 90, 93, 50, 86, 78, 89, 98, 75, 80, 50, 64, 55, 100, 90, 110, 80, 50, 74, 90, 70, 70, 56, 80, 79, 55, 65, 59, 90, 50, 90, 90, 75, 210, 35, 86, 92, 80, 75, 100, 60, 50, 68, 51, 50, 53]
 
     overdrive20 = [61, 80, 47, 75, 70, 70, 95, 79, 65, 31, 50, 59, 90, 58, 0, 78, 50, 70, 62, 49, 64,
-                   46, 73, 95, 67, 84, 70, 78, 69, 70, 50, 80, 80, 63, 25, 50, 72, 55, 50, 95, 55, 70, 90, 70, 99, 80, 61, 40, 69, 62, 51, 90, 67, 60, 100, 200, 85, 50, 92, 50, 75, 80, 49.5, 50, 100, 51]
+                   46, 73, 95, 67, 84, 70, 78, 69, 70, 50, 80, 80, 63, 25, 50, 72, 55, 50, 95, 55, 70, 90, 70, 99, 80, 61, 40, 69, 62, 51, 90, 67, 60, 100, 200, 85, 50, 92, 50, 75, 80, 49.5, 50, 100, 51, 54, 65.5]
 
     frag30 = [88, 90, 100, 75, 80, 89, 70, 79, 65, 40, 50, 90, 100, 92, 0, 61, 67, 92, 85, 50, 86, 62,
-              65, 85, 67, 88, 74, 0.5, 105, 80, 95, 50, 80, 87, 71, 50, 95, 0, 80, 75, 50, 70, 80, 100, 65, 80, 61, 50, 68, 60, 90, 67, 50, 60, 51, 50, 35, 85, 47, 50, 75, 80, 89.5, 50, 50, 51]
+              65, 85, 67, 88, 74, 0.5, 105, 80, 95, 50, 80, 87, 71, 50, 95, 0, 80, 75, 50, 70, 80, 100, 65, 80, 61, 50, 68, 60, 90, 67, 50, 60, 51, 50, 35, 85, 47, 50, 75, 80, 90, 80, 50, 51, 64, 100]
 
     prog30 = [71, 90, 80, 75, 100, 80, 90, 102, 84, 78, 110, 77, 73, 78, 0, 99, 80, 66, 46, 93, 40, 83,
-              80, 90, 93, 50, 96, 88, 99, 108, 75, 80, 50, 64, 55, 100, 100, 110, 80, 50, 74, 90, 80, 80, 56, 80, 79, 55, 65, 59, 90, 50, 90, 90, 75, 210, 35, 86, 92, 80, 75, 100, 60, 50, 68, 51]
+              80, 90, 93, 50, 96, 88, 99, 108, 75, 80, 50, 64, 55, 100, 100, 110, 80, 50, 74, 90, 80, 80, 56, 80, 79, 55, 65, 59, 90, 50, 90, 90, 75, 210, 35, 86, 92, 80, 75, 100, 60, 50, 68, 51, 60, 53]
 
     overdrive30 = [71, 90, 57, 75, 80, 80, 95, 79, 65, 31, 50, 69, 100, 68, 0, 78, 50, 70, 62, 59, 64,
-                   56, 73, 95, 67, 84, 80, 88, 79, 80, 50, 80, 80, 63, 25, 50, 82, 55, 50, 95, 55, 70, 100, 80, 99, 80, 61, 40, 69, 62, 51, 90, 67, 60, 100, 200, 85, 50, 92, 50, 75, 80, 49.5, 50, 100, 51]
+                   56, 73, 95, 67, 84, 80, 88, 79, 80, 50, 80, 80, 63, 25, 50, 82, 55, 50, 95, 55, 70, 100, 80, 99, 80, 61, 40, 69, 62, 51, 90, 67, 60, 100, 200, 85, 50, 92, 50, 75, 80, 49.5, 50, 100, 51, 64, 65.5]
 
     char_type = [1, 0, 0, 0, 0, 0, 0, 2, 0, 1, 2, 0, 0, 0, 2, 3, 1, 0, 0, 0, 1,
-                 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 2, 2, 2, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 2, 3, 0, 2, 2, 0, 0, 2, 0, 0, 2, 0]
+                 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 2, 2, 2, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 2, 3, 0, 2, 2, 0, 0, 2, 0, 0, 2, 0, 2, 2]
 
     char_core = {
         0: [{'core_id': 'core_hollow', 'amount': 25}, {'core_id': 'core_desolate', 'amount': 5}],
@@ -58,14 +58,15 @@ class InitData:
         11: [{'core_id': 'core_binary', 'amount': 25}, {'core_id': 'core_hollow', 'amount': 5}],
         12: [{'core_id': 'core_binary', 'amount': 25}, {'core_id': 'core_desolate', 'amount': 5}],
         19: [{'core_id': 'core_colorful', 'amount': 30}],
-        10: [{'core_id': 'core_umbral', 'amount': 30}],  # TODO: check
+        10: [{'core_id': 'core_umbral', 'amount': 30}],
+        66: [{'core_id': 'core_chunithm', 'amount': 15}]
     }
 
     cores = ['core_hollow', 'core_desolate', 'core_chunithm', 'core_crimson',
              'core_ambivalent', 'core_scarlet', 'core_groove', 'core_generic', 'core_binary', 'core_colorful', 'core_course_skip_purchase', 'core_umbral']
 
     world_songs = ["babaroque", "shadesoflight", "kanagawa", "lucifer", "anokumene", "ignotus", "rabbitintheblackroom", "qualia", "redandblue", "bookmaker", "darakunosono", "espebranch", "blacklotus", "givemeanightmare", "vividtheory", "onefr", "gekka", "vexaria3", "infinityheaven3", "fairytale3", "goodtek3", "suomi", "rugie", "faintlight", "harutopia", "goodtek", "dreaminattraction", "syro", "diode", "freefall", "grimheart", "blaster",
-                   "cyberneciacatharsis", "monochromeprincess", "revixy", "vector", "supernova", "nhelv", "purgatorium3", "dement3", "crossover", "guardina", "axiumcrisis", "worldvanquisher", "sheriruth", "pragmatism", "gloryroad", "etherstrike", "corpssansorganes", "lostdesire", "blrink", "essenceoftwilight", "lapis", "solitarydream", "lumia3", "purpleverse", "moonheart3", "glow", "enchantedlove", "take", "lifeispiano", "vandalism", "nexttoyou3", "lostcivilization3", "turbocharger", "bookmaker3", "laqryma3", "kyogenkigo", "hivemind", "seclusion", "quonwacca3", "bluecomet", "energysynergymatrix", "gengaozo", "lastendconductor3", "antithese3", "qualia3", "kanagawa3", "heavensdoor3", "pragmatism3", "nulctrl", "avril", "ddd", "merlin3", "omakeno3", "nekonote", "sanskia", 'altair', 'mukishitsu', 'trapcrow', 'redandblue3', 'ignotus3', 'singularity3', 'dropdead3', 'arcahv', 'freefall3', 'partyvinyl3', 'tsukinimurakumo', 'mantis', 'worldfragments', 'astrawalkthrough', 'chronicle', 'trappola3', 'letsrock']
+                   "cyberneciacatharsis", "monochromeprincess", "revixy", "vector", "supernova", "nhelv", "purgatorium3", "dement3", "crossover", "guardina", "axiumcrisis", "worldvanquisher", "sheriruth", "pragmatism", "gloryroad", "etherstrike", "corpssansorganes", "lostdesire", "blrink", "essenceoftwilight", "lapis", "solitarydream", "lumia3", "purpleverse", "moonheart3", "glow", "enchantedlove", "take", "lifeispiano", "vandalism", "nexttoyou3", "lostcivilization3", "turbocharger", "bookmaker3", "laqryma3", "kyogenkigo", "hivemind", "seclusion", "quonwacca3", "bluecomet", "energysynergymatrix", "gengaozo", "lastendconductor3", "antithese3", "qualia3", "kanagawa3", "heavensdoor3", "pragmatism3", "nulctrl", "avril", "ddd", "merlin3", "omakeno3", "nekonote", "sanskia", 'altair', 'mukishitsu', 'trapcrow', 'redandblue3', 'ignotus3', 'singularity3', 'dropdead3', 'arcahv', 'freefall3', 'partyvinyl3', 'tsukinimurakumo', 'mantis', 'worldfragments', 'astrawalkthrough', 'chronicle', 'trappola3', 'letsrock', 'shadesoflight3', 'teriqma3', 'impact3']
 
     world_unlocks = ["scenery_chap1", "scenery_chap2",
                      "scenery_chap3", "scenery_chap4", "scenery_chap5", "scenery_chap6", "scenery_chap7"]
diff --git a/latest version/database/init/packs.json b/latest version/database/init/packs.json
index 00d9546..25513f3 100644
--- a/latest version/database/init/packs.json	
+++ b/latest version/database/init/packs.json	
@@ -664,5 +664,23 @@
 		],
 		"orig_price": 400,
 		"price": 400
+	},
+	{
+		"name": "chunithm_append_2",
+		"items": [
+			{
+				"type": "pack",
+				"id": "chunithm_append_2",
+				"is_available": true
+			},
+			{
+				"type": "core",
+				"amount": 5,
+				"id": "core_generic",
+				"is_available": true
+			}
+		],
+		"orig_price": 500,
+		"price": 500
 	}
 ]
\ No newline at end of file
diff --git a/latest version/database/init/singles.json b/latest version/database/init/singles.json
index 3c1ad0d..818cda9 100644
--- a/latest version/database/init/singles.json	
+++ b/latest version/database/init/singles.json	
@@ -1360,5 +1360,23 @@
 		],
 		"orig_price": 100,
 		"price": 100
+	},
+	{
+		"name": "primitivelights",
+		"items": [
+			{
+				"type": "single",
+				"id": "primitivelights",
+				"is_available": true
+			},
+			{
+				"type": "core",
+				"amount": 1,
+				"id": "core_generic",
+				"is_available": true
+			}
+		],
+		"orig_price": 100,
+		"price": 100
 	}
 ]
\ No newline at end of file
diff --git a/latest version/linkplay_server/store.py b/latest version/linkplay_server/store.py
index 7c1ba3d..0edd26d 100644
--- a/latest version/linkplay_server/store.py	
+++ b/latest version/linkplay_server/store.py	
@@ -61,16 +61,16 @@ def memory_clean(now):
     with Store.lock:
         clean_room_list = []
         clean_player_list = []
-        for token in Store.link_play_data:
-            room = Store.link_play_data[token]['room']
+        for token, v in Store.link_play_data.items():
+            room = v['room']
             if now - room.timestamp >= Config.TIME_LIMIT:
                 clean_room_list.append(room.room_id)
 
-            if now - room.players[Store.link_play_data[token]['player_index']].last_timestamp // 1000 >= Config.TIME_LIMIT:
+            if now - room.players[v['player_index']].last_timestamp // 1000 >= Config.TIME_LIMIT:
                 clean_player_list.append(token)
 
-        for room_id in Store.room_id_dict:
-            if now - Store.room_id_dict[room_id].timestamp >= Config.TIME_LIMIT:
+        for room_id, v in Store.room_id_dict.items():
+            if now - v.timestamp >= Config.TIME_LIMIT:
                 clean_room_list.append(room_id)
 
         for room_id in clean_room_list:
@@ -190,10 +190,10 @@ def join_room(self) -> tuple:
             if player_num == 4:
                 # 满人
                 return '1201'
-            elif player_num == 0:
+            if player_num == 0:
                 # 房间不存在
                 return '1202'
-            elif room.state != 2:
+            if room.state != 2:
                 # 无法加入
                 return '1205'
 
diff --git a/latest version/linkplay_server/udp_class.py b/latest version/linkplay_server/udp_class.py
index e3df5f5..af27092 100644
--- a/latest version/linkplay_server/udp_class.py	
+++ b/latest version/linkplay_server/udp_class.py	
@@ -164,8 +164,7 @@ def is_ready(self, old_state: int, player_state: int):
                     return False
 
             return True
-        else:
-            return False
+        return False
 
     def is_finish(self):
         # 是否全部进入结算
diff --git a/latest version/linkplay_server/udp_parser.py b/latest version/linkplay_server/udp_parser.py
index 213c17b..90e0061 100644
--- a/latest version/linkplay_server/udp_parser.py	
+++ b/latest version/linkplay_server/udp_parser.py	
@@ -13,8 +13,9 @@ def __init__(self, room: Room, player_index: int = 0) -> None:
         self.room = room
         self.player_index = player_index
         self.s = CommandSender(self.room)
+        self.command: bytes = None
 
-    def get_commands(self, command):
+    def get_commands(self, command: bytes):
         self.command = command
         r = getattr(self, self.route[self.command[2]])()
 
@@ -47,8 +48,6 @@ def command_01(self):
         self.s.random_code = self.command[16:24]
         self.room.command_queue.append(self.s.command_10())
 
-        return None
-
     def command_02(self):
         self.s.random_code = self.command[16:24]
         song_idx = bi(self.command[24:26])
@@ -81,8 +80,6 @@ def command_03(self):
             self.room.make_finish()
             self.room.command_queue.append(self.s.command_13())
 
-        return None
-
     def command_04(self):
         # 踢人
         self.s.random_code = self.command[16:24]
@@ -109,7 +106,6 @@ def command_06(self):
         self.room.song_idx = 0xffff
 
         self.room.command_queue.append(self.s.command_13())
-        return None
 
     def command_07(self):
         self.s.random_code = self.command[16:24]
@@ -117,15 +113,12 @@ def command_07(self):
         self.room.update_song_unlock()
 
         self.room.command_queue.append(self.s.command_14())
-        return None
 
     def command_08(self):
         self.room.round_switch = bi(self.command[24:25])
         self.s.random_code = self.command[16:24]
         self.room.command_queue.append(self.s.command_13())
 
-        return None
-
     def command_09(self):
         re = []
         self.s.random_code = self.command[16:24]
@@ -196,7 +189,7 @@ def command_09(self):
                     # 将换房主时间提前到此刻
                     self.room.make_round()
 
-            if self.room.state == 4 or self.room.state == 5 or self.room.state == 6:
+            if self.room.state in (4, 5, 6):
                 timestamp = round(time.time() * 1000)
                 self.room.countdown -= timestamp - self.room.timestamp
                 self.room.timestamp = timestamp
@@ -225,10 +218,9 @@ def command_09(self):
                     self.room.countdown = 0xffffffff
                     flag_13 = True
 
-                if self.room.countdown <= 0:
-                    self.room.countdown = 0
+                self.room.countdown = self.room.countdown if self.room.countdown > 0 else 0
 
-            if self.room.state == 7 or self.room.state == 8:
+            if self.room.state in (7, 8):
                 if player.timer < bi(self.command[28:32]) or bi(self.command[28:32]) == 0 and player.timer != 0:
                     player.last_timer = player.timer
                     player.last_score = player.score
@@ -270,13 +262,12 @@ def command_0a(self):
 
         self.room.command_queue.append(self.s.command_12(self.player_index))
 
-        if self.room.state == 3 or self.room.state == 2:
+        if self.room.state in (2, 3):
             self.room.state = 1
             self.room.song_idx = 0xffff
         # self.room.command_queue.append(self.s.command_11())
         self.room.command_queue.append(self.s.command_13())
         self.room.command_queue.append(self.s.command_14())
-        return None
 
     def command_0b(self):
         # 推荐歌曲
@@ -285,5 +276,3 @@ def command_0b(self):
             if self.player_index != i and self.room.players[i].online == 1:
                 self.room.players[i].extra_command_queue.append(
                     self.s.command_0f(self.player_index, song_idx))
-
-        return None
diff --git a/latest version/server/__init__.py b/latest version/server/__init__.py
index d07d4f4..a6d5e70 100644
--- a/latest version/server/__init__.py	
+++ b/latest version/server/__init__.py	
@@ -1,6 +1,7 @@
-from core.config_manager import Config
 from flask import Blueprint
 
+from core.config_manager import Config
+
 from . import (auth, course, friend, multiplayer, others, present, purchase,
                score, user, world)
 
diff --git a/latest version/server/auth.py b/latest version/server/auth.py
index ded07bd..5617c9a 100644
--- a/latest version/server/auth.py	
+++ b/latest version/server/auth.py	
@@ -1,10 +1,11 @@
 import base64
 from functools import wraps
 
+from flask import Blueprint, current_app, g, jsonify, request
+
 from core.error import ArcError, NoAccess
 from core.sql import Connect
 from core.user import UserAuth, UserLogin
-from flask import Blueprint, g, jsonify, request, current_app
 
 from .func import arc_try, error_return, header_check
 
@@ -35,15 +36,21 @@ def login():
         return jsonify({"success": True, "token_type": "Bearer", 'user_id': user.user_id, 'access_token': user.token})
 
 
-def auth_required(request):
+@bp.route('/verify', methods=['POST'])  # 邮箱验证进度查询
+@arc_try
+def email_verify():
+    raise ArcError('Email verification unavailable.', 151, status=404)
+
+
+def auth_required(req):
     # arcaea登录验证，写成了修饰器
     def decorator(view):
         @wraps(view)
         def wrapped_view(*args, **kwargs):
 
-            headers = request.headers
+            headers = req.headers
 
-            e = header_check(request)
+            e = header_check(req)
             if e is not None:
                 current_app.logger.warning(
                     f' - {e.error_code}|{e.api_error_code}: {e}')
diff --git a/latest version/server/course.py b/latest version/server/course.py
index adb0d88..5ecb3c4 100644
--- a/latest version/server/course.py	
+++ b/latest version/server/course.py	
@@ -1,9 +1,10 @@
+from flask import Blueprint, request
+
 from core.constant import Constant
 from core.course import UserCourseList
 from core.item import ItemCore
 from core.sql import Connect
 from core.user import UserOnline
-from flask import Blueprint, request
 
 from .auth import auth_required
 from .func import arc_try, success_return
diff --git a/latest version/server/friend.py b/latest version/server/friend.py
index 5dde330..df9fee1 100644
--- a/latest version/server/friend.py	
+++ b/latest version/server/friend.py	
@@ -1,6 +1,7 @@
+from flask import Blueprint, request
+
 from core.sql import Connect
 from core.user import UserOnline, code_get_id
-from flask import Blueprint, request
 
 from .auth import auth_required
 from .func import arc_try, success_return
diff --git a/latest version/server/func.py b/latest version/server/func.py
index bc2f0f7..c2d96ef 100644
--- a/latest version/server/func.py	
+++ b/latest version/server/func.py	
@@ -40,6 +40,8 @@ def error_return(e: ArcError = default_error):  # 错误返回
     # 124 你今天不能再使用这个IP地址创建新的账号
     # 150 非常抱歉您已被限制使用此功能
     # 151 目前无法使用此功能
+    # 160 账户未邮箱认证，请检查邮箱
+    # 161  账户认证过期，请重新注册
     # 401 用户不存在
     # 403 无法连接至服务器
     # 501 502 -6 此物品目前无法获取
@@ -51,6 +53,7 @@ def error_return(e: ArcError = default_error):  # 错误返回
     # 604 你不能加自己为好友
     # 903 下载量超过了限制，请24小时后重试
     # 905 请在再次使用此功能前等待24小时
+    # 910 重新请求验证邮件前需等待x分钟 extra: retry_at
     # 1001 设备数量达到上限
     # 1002 此设备已使用过此功能
     # 1201 房间已满
@@ -86,8 +89,7 @@ def wrapped_view(*args, **kwargs):
             data = view(*args, **kwargs)
             if data is None:
                 return error_return()
-            else:
-                return data
+            return data
         except ArcError as e:
             if Config.ALLOW_WARNING_LOG:
                 current_app.logger.warning(format_exc())
diff --git a/latest version/server/multiplayer.py b/latest version/server/multiplayer.py
index d4e3f7a..7a1e6b9 100644
--- a/latest version/server/multiplayer.py	
+++ b/latest version/server/multiplayer.py	
@@ -1,8 +1,9 @@
+from flask import Blueprint, request
+
 from core.config_manager import Config
 from core.error import ArcError
 from core.linkplay import Player, RemoteMultiPlayer, Room
 from core.sql import Connect
-from flask import Blueprint, request
 
 from .auth import auth_required
 from .func import arc_try, success_return
diff --git a/latest version/server/others.py b/latest version/server/others.py
index 0d37103..e716678 100644
--- a/latest version/server/others.py	
+++ b/latest version/server/others.py	
@@ -1,13 +1,14 @@
 import json
 from urllib.parse import parse_qs, urlparse
 
+from flask import Blueprint, jsonify, request
+from werkzeug.datastructures import ImmutableMultiDict
+
 from core.download import DownloadList
 from core.error import RateLimit
 from core.sql import Connect
 from core.system import GameInfo
 from core.user import UserOnline
-from flask import Blueprint, jsonify, request
-from werkzeug.datastructures import ImmutableMultiDict
 
 from .auth import auth_required
 from .func import arc_try, error_return, success_return
diff --git a/latest version/server/present.py b/latest version/server/present.py
index a9a6e6b..85beb97 100644
--- a/latest version/server/present.py	
+++ b/latest version/server/present.py	
@@ -1,7 +1,8 @@
+from flask import Blueprint, request
+
 from core.present import UserPresent, UserPresentList
 from core.sql import Connect
 from core.user import UserOnline
-from flask import Blueprint, request
 
 from .auth import auth_required
 from .func import arc_try, success_return
diff --git a/latest version/server/purchase.py b/latest version/server/purchase.py
index e081d58..b45b315 100644
--- a/latest version/server/purchase.py	
+++ b/latest version/server/purchase.py	
@@ -1,12 +1,13 @@
 from time import time
 
+from flask import Blueprint, request
+
 from core.error import InputError, ItemUnavailable, PostError
 from core.item import ItemFactory, Stamina6
 from core.purchase import Purchase, PurchaseList
 from core.redeem import UserRedeem
 from core.sql import Connect
 from core.user import UserOnline
-from flask import Blueprint, request
 
 from .auth import auth_required
 from .func import arc_try, success_return
diff --git a/latest version/server/score.py b/latest version/server/score.py
index 573f609..5c6bf5b 100644
--- a/latest version/server/score.py	
+++ b/latest version/server/score.py	
@@ -1,12 +1,13 @@
 from time import time
-from core.course import CoursePlay
 
+from flask import Blueprint, request
+
+from core.course import CoursePlay
 from core.error import InputError
 from core.rank import RankList
 from core.score import UserPlay
 from core.sql import Connect
 from core.user import UserOnline
-from flask import Blueprint, request
 
 from .auth import auth_required
 from .func import arc_try, success_return
@@ -94,6 +95,8 @@ def song_score_post(user_id):
                     request.form['miss_count'], request.form['health'], request.form['modifier'], int(time() * 1000), request.form['clear_type'])
         x.beyond_gauge = int(request.form['beyond_gauge'])
         x.submission_hash = request.form['submission_hash']
+        if 'combo_interval_bonus' in request.form:
+            x.combo_interval_bonus = int(request.form['combo_interval_bonus'])
         if not x.is_valid:
             raise InputError('Invalid score.', 107)
         x.upload_score()
diff --git a/latest version/server/user.py b/latest version/server/user.py
index d290086..50ee979 100644
--- a/latest version/server/user.py	
+++ b/latest version/server/user.py	
@@ -1,11 +1,11 @@
+from flask import Blueprint, request
+
 from core.character import UserCharacter
-from core.config_manager import Config
-from core.error import ArcError, NoAccess
+from core.error import ArcError
 from core.item import ItemCore
 from core.save import SaveData
 from core.sql import Connect
 from core.user import User, UserLogin, UserOnline, UserRegister
-from flask import Blueprint, request
 
 from .auth import auth_required
 from .func import arc_try, header_check, success_return
@@ -16,7 +16,6 @@
 @bp.route('', methods=['POST'])  # 注册接口
 @arc_try
 def register():
-    headers = request.headers
     error = header_check(request)
     if error is not None:
         raise error
@@ -155,7 +154,7 @@ def sys_set(user_id, set_arg):
             user.change_favorite_character(int(value))
         else:
             value = 'true' == value
-            if 'is_hide_rating' == set_arg or 'max_stamina_notification_enabled' == set_arg:
+            if set_arg in ('is_hide_rating', 'max_stamina_notification_enabled'):
                 user.update_user_one_column(set_arg, value)
         return success_return(user.to_dict())
 
@@ -165,3 +164,9 @@ def sys_set(user_id, set_arg):
 @arc_try
 def user_delete(user_id):
     raise ArcError('Cannot delete the account.', 151, status=404)
+
+
+@bp.route('/email/resend_verify', methods=['POST'])  # 邮箱验证重发
+@arc_try
+def email_resend_verify():
+    raise ArcError('Email verification unavailable.', 151, status=404)
diff --git a/latest version/server/world.py b/latest version/server/world.py
index caa122a..8567ea0 100644
--- a/latest version/server/world.py	
+++ b/latest version/server/world.py	
@@ -1,7 +1,8 @@
+from flask import Blueprint, request
+
 from core.sql import Connect
 from core.user import UserOnline
 from core.world import UserMap, get_world_all
-from flask import Blueprint, request
 
 from .auth import auth_required
 from .func import arc_try, success_return
diff --git a/latest version/web/index.py b/latest version/web/index.py
index 5398d07..0031d01 100644
--- a/latest version/web/index.py	
+++ b/latest version/web/index.py	
@@ -422,7 +422,7 @@ def all_character():
 def change_character():
     # 修改角色数据
     skill_ids = ['No_skill', 'gauge_easy', 'note_mirror', 'gauge_hard', 'frag_plus_10_pack_stellights', 'gauge_easy|frag_plus_15_pst&prs', 'gauge_hard|fail_frag_minus_100', 'frag_plus_5_side_light', 'visual_hide_hp', 'frag_plus_5_side_conflict', 'challenge_fullcombo_0gauge', 'gauge_overflow', 'gauge_easy|note_mirror', 'note_mirror', 'visual_tomato_pack_tonesphere',
-                 'frag_rng_ayu', 'gaugestart_30|gaugegain_70', 'combo_100-frag_1', 'audio_gcemptyhit_pack_groovecoaster', 'gauge_saya', 'gauge_chuni', 'kantandeshou', 'gauge_haruna', 'frags_nono', 'gauge_pandora', 'gauge_regulus', 'omatsuri_daynight', 'sometimes(note_mirror|frag_plus_5)', 'scoreclear_aa|visual_scoregauge', 'gauge_tempest', 'gauge_hard', 'gauge_ilith_summer', 'frags_kou', 'visual_ink', 'shirabe_entry_fee', 'frags_yume', 'note_mirror|visual_hide_far', 'frags_ongeki', 'gauge_areus', 'gauge_seele', 'gauge_isabelle', 'gauge_exhaustion', 'skill_lagrange', 'gauge_safe_10', 'frags_nami', 'skill_elizabeth', 'skill_lily', 'skill_kanae_midsummer', 'eto_uncap', 'luna_uncap', 'frags_preferred_song', 'visual_ghost_skynotes', 'ayu_uncap', 'skill_vita', 'skill_fatalis', 'skill_reunion', 'frags_ongeki_slash', 'frags_ongeki_hard', 'skill_amane', 'skill_kou_winter', 'gauge_hard|note_mirror']
+                 'frag_rng_ayu', 'gaugestart_30|gaugegain_70', 'combo_100-frag_1', 'audio_gcemptyhit_pack_groovecoaster', 'gauge_saya', 'gauge_chuni', 'kantandeshou', 'gauge_haruna', 'frags_nono', 'gauge_pandora', 'gauge_regulus', 'omatsuri_daynight', 'sometimes(note_mirror|frag_plus_5)', 'scoreclear_aa|visual_scoregauge', 'gauge_tempest', 'gauge_hard', 'gauge_ilith_summer', 'frags_kou', 'visual_ink', 'shirabe_entry_fee', 'frags_yume', 'note_mirror|visual_hide_far', 'frags_ongeki', 'gauge_areus', 'gauge_seele', 'gauge_isabelle', 'gauge_exhaustion', 'skill_lagrange', 'gauge_safe_10', 'frags_nami', 'skill_elizabeth', 'skill_lily', 'skill_kanae_midsummer', 'eto_uncap', 'luna_uncap', 'frags_preferred_song', 'visual_ghost_skynotes', 'ayu_uncap', 'skill_vita', 'skill_fatalis', 'skill_reunion', 'frags_ongeki_slash', 'frags_ongeki_hard', 'skill_amane', 'skill_kou_winter', 'gauge_hard|note_mirror', 'skill_shama', 'skill_milk', 'skill_shikoku', 'skill_mika', 'ilith_awakened_skill', 'skill_mithra', 'skill_toa']
     return render_template('web/changechar.html', skill_ids=skill_ids)