diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 48d1bde..e1ba390 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -30,10 +30,11 @@ jobs:
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Test with pytest
       run: |
-        pytest --continue-on-collection-errors
+        git fetch --no-tags --prune --depth=1 origin +refs/heads/*:refs/remotes/origin/*
+        git diff origin/main HEAD --name-only -- practice | xargs dirname | sort | uniq | xargs pytest
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
\ No newline at end of file
diff --git a/practice/bowling/bowling.py b/practice/bowling/bowling.py
index de2dbb0..c038cd5 100644
--- a/practice/bowling/bowling.py
+++ b/practice/bowling/bowling.py
@@ -1,9 +1,50 @@
 class BowlingGame:
+
     def __init__(self):
-        pass
+        self.rolls = []
+        self.current_roll = 0
 
     def roll(self, pins):
-        pass
+        if pins < 0 or pins > 10:
+            raise ValueError('Invalid roll')
+        
+        if self.current_roll > 20 or (self.current_roll == 20 and not self.is_last_frame_strike_or_spare()):
+            raise Exception('Game already has 10 frames')
+
+        self.rolls.append(pins)
+        self.current_roll += 1
 
     def score(self):
+        score = 0
+        roll_index = 0
+
+        for frame in range(10):
+            if self.is_strike(roll_index):
+                score += 10 + self.strike_bonus(roll_index)
+                roll_index += 1
+            elif self.is_spare(roll_index):
+                score += 10 + self.spare_bonus(roll_index)
+                roll_index += 2
+            else:
+                score += self.rolls[roll_index] + self.rolls[roll_index + 1] 
+                roll_index += 2
+        
+        return score
+
+    def is_strike(self, roll_index):
+        return self.rolls[roll_index] == 10
+    
+    def is_spare(self, roll_index):
+        return self.rolls[roll_index] + self.rolls[roll_index + 1] == 10
+    
+    def strike_bonus(self, roll_index):
+        return self.rolls[roll_index + 1] + self.rolls[roll_index + 2]
+
+    def spare_bonus(self, roll_index):
+        return self.rolls[roll_index + 2]
+
+    def is_last_frame_strike_or_spare(self):
+        return self.is_strike(18) or self.is_spare(18)
+
+
         pass