diff --git a/engine/src/lib/Economy.ts b/engine/src/lib/Economy.ts
index 4668bc1..36cdf86 100644
--- a/engine/src/lib/Economy.ts
+++ b/engine/src/lib/Economy.ts
@@ -23,6 +23,7 @@ export class Economy<
   readonly resources: EnergyCalculation<ResourceType>;
 
   constructor(
+    // TODO add/replace: readonly seed - binary or ID like/derived string
     readonly name: string, // TODO? remove unused - or use this as a type? - rather leave it to an actual entity
     resources: Stock<ResourceType>,
     readonly buildings: Building<ResourceType, BuildingType>[] = [],
diff --git a/engine/src/lib/Phlame.spec.ts b/engine/src/lib/Phlame.spec.ts
index f6fb129..ef85c61 100644
--- a/engine/src/lib/Phlame.spec.ts
+++ b/engine/src/lib/Phlame.spec.ts
@@ -71,5 +71,6 @@ describe('Phlame Entity', () => {
     expect(phlame.lastTick).to.eql(1);
   });
 
-  // it.todo("should have env properties - e.g. base temperature to start from");
+  // it.todo("should have env properties - e.g. base temperature and amounts of resources to start from");
+  // idea: use parts of the ID for random data
 });
diff --git a/engine/src/lib/Phlame.ts b/engine/src/lib/Phlame.ts
index f90972b..7844ce8 100644
--- a/engine/src/lib/Phlame.ts
+++ b/engine/src/lib/Phlame.ts
@@ -8,6 +8,7 @@ export type PhlameJSON<
   UnitType extends BuildingIdentifier,
 > = {
   id: ID;
+  tick: TimeUnit;
   stock: StockJSON<ResourceType>;
   buildings: BuildingJSON<UnitType>[];
 };
@@ -46,7 +47,8 @@ export class Phlame<ResourceType extends ResourceIdentifier, UnitType extends Bu
   update(tick: TimeUnit) {
     const { lastTick } = this;
     this.tick = tick;
-    // TODO update economy
+    // TODO while checking actions
+    this.economy = this.economy.tick(tick - lastTick);
     return this;
   }
 
@@ -55,9 +57,10 @@ export class Phlame<ResourceType extends ResourceIdentifier, UnitType extends Bu
   }
 
   toJSON(): PhlameJSON<ResourceType, UnitType> {
-    const { id, economy } = this;
+    const { id, economy, tick } = this;
     return {
       id,
+      tick,
       ...economy.toJSON(),
     };
   }
diff --git a/src/app/engine/factory.ts b/src/app/engine/factory.ts
index 7031130..fa98304 100644
--- a/src/app/engine/factory.ts
+++ b/src/app/engine/factory.ts
@@ -14,7 +14,6 @@ import {
   type PhlameJSON,
   EmpireJSON,
 } from '@phlame/engine';
-import { Zeitgeber } from '../signals/zeitgeber';
 import { ResourceFactory, type ResourceIdentifier } from './resources';
 import { BuildingFactory, type BuildingIdentifier } from './buildings';
 
@@ -23,7 +22,6 @@ export type PhlameEntity = Phlame<ResourceIdentifier, BuildingIdentifier>;
 
 @injectable
 export class EngineFactory {
-  #zeit = inject(Zeitgeber);
   #resource = inject(ResourceFactory);
   #building = inject(BuildingFactory);
 
@@ -36,16 +34,16 @@ export class EngineFactory {
   createEntities(
     es: PhlameJSON<ResourceIdentifier, BuildingIdentifier>[],
   ): Phlame<ResourceIdentifier, BuildingIdentifier>[] {
-    return es.map((p) => this.createPhlame(p.id, p.stock, p.buildings));
+    return es.map((p) => this.createPhlame(p.id, p.tick, p.stock, p.buildings));
   }
 
   createPhlame(
     id: ID,
+    tick: number,
     stock: StockJSON<ResourceIdentifier>,
     // TODO actions
     buildings: BuildingJSON<BuildingIdentifier>[] = [],
   ): Phlame<ResourceIdentifier, BuildingIdentifier> {
-    const { tick } = this.#zeit();
     return new Phlame(
       id,
       this.createEconomy({
diff --git a/src/app/engine/services.ts b/src/app/engine/services.ts
index 157e2db..46ad919 100644
--- a/src/app/engine/services.ts
+++ b/src/app/engine/services.ts
@@ -8,12 +8,12 @@ import { type EmpireEntity, EngineFactory } from './factory';
 export function emptyEconomy(name: string) {
   return new Economy<ResourceIdentifier, BuildingIdentifier>(name, emptyStock, defaultBuildings);
 }
-export function emptyPlanet(id: ID) {
-  return new Phlame<ResourceIdentifier, BuildingIdentifier>(id, emptyEconomy(`E${id}`));
+export function emptyPlanet(id: ID, tick?: number) {
+  return new Phlame<ResourceIdentifier, BuildingIdentifier>(id, emptyEconomy(`E${id}`), [], tick);
 }
 
-export function emptyEmpire(id: ID, planetID: ID) {
-  return new Empire<ResourceIdentifier, BuildingIdentifier>(id, [emptyPlanet(planetID)]);
+export function emptyEmpire(id: ID, planetID: ID, tick?: number) {
+  return new Empire<ResourceIdentifier, BuildingIdentifier>(id, [emptyPlanet(planetID, tick)]);
 }
 
 export class Repository<T extends Entity> {
diff --git a/src/app/game.element.tsx b/src/app/game.element.tsx
index 1366868..d2e89c3 100644
--- a/src/app/game.element.tsx
+++ b/src/app/game.element.tsx
@@ -13,15 +13,13 @@ export const gameToJSX = (t: I18n, empire: Empire<ResourceIdentifier, BuildingId
   <>
     <empire-ctx id={empire.id} entities={JSON.stringify(empire.toJSON().entities)}>
       <div class="grid grid-cols-1 md:grid-cols-3 gap-4">
-        <ph-ctx id={empire.entities[0].id}>
-          <ph-planet>{planetToJSX(t, empire.entities[0])}</ph-planet>
-        </ph-ctx>
-        <div class="">
-          <ph-planet />
-        </div>
-        <div class="">
-          <ph-planet />
-        </div>
+        {empire.entities.map((p) => (
+          <>
+            <ph-ctx id={p.id}>
+              <ph-planet>{planetToJSX(t, p)}</ph-planet>
+            </ph-ctx>
+          </>
+        ))}
       </div>
     </empire-ctx>
   </>
diff --git a/src/engine.server.ts b/src/engine.server.ts
index 4194a06..e98727e 100644
--- a/src/engine.server.ts
+++ b/src/engine.server.ts
@@ -55,29 +55,44 @@ export class EngineService {
     return this;
   }
 
+  /**
+   * @param sid SessionID
+   * @returns {Promise<number>} error code
+   */
   async load(sid: string) {
     const zeit = this.#zeit();
     const persistence = this.#persistence();
-    // TODO try {} catch (JSON parse)
-    const {
-      zeit: { time, tick },
-      empire,
-    } = await persistence.loadSession(sid);
-    console.log('Loading', tick, 'from', time, sid, empire.id, empire.entities[0]?.id);
-    /* if (tick && tick !== zeit.tick) {
-      zeit.stop();
-      // TODO catch up ticks
-      zeit.start(time, tick);
-    }*/
-    this.#empire().setupFromJSON(empire);
+    try {
+      const session = await persistence.loadSession(sid);
+      const {
+        zeit: { time, tick },
+        empire,
+      } = session;
+      console.log('Current', zeit.tick, 'at  ', zeit.time);
+      // Actually Session(User) Empire & MainPlanet could share an ID, then it could be ommitted for log readability?
+      console.log('Loading', tick, 'from', time, sid); //, empire.id, empire.entities[0]?.id);
+      console.log('Created', zeit.tick - tick, 'ticks ago.');
+      /* if (tick && tick !== zeit.tick) {
+        zeit.stop();
+        // TODO catch up ticks with actions
+        zeit.start(time, tick);
+      }*/
+      this.#empire().setupFromJSON(empire);
+
+      return 0;
+    } catch (e: any) {
+      this.#logger().log('Error loading session', sid, e?.code, e);
+      return e?.code || 1;
+    }
   }
 
   async generateSession() {
+    const zeit = this.#zeit();
     const persistence = this.#persistence();
     const sid = persistence.generateID();
     const eid = persistence.generateID();
     const pid = persistence.generateID();
-    const session = this.createSession(sid, eid, pid);
+    const session = this.createSession(sid, eid, pid, zeit.tick);
     await this.saveSession(session);
     this.#empire().setup(session.empire);
     return session;
@@ -92,8 +107,8 @@ export class EngineService {
     });
   }
 
-  createSession(sid: string, eid: string, pid: string): Session {
-    const empire = emptyEmpire(eid, pid);
+  createSession(sid: string, eid: string, pid: string, tick?: number): Session {
+    const empire = emptyEmpire(eid, pid, tick);
     return {
       sid,
       empire,
diff --git a/src/render.server.tsx b/src/render.server.tsx
index e4a6aa2..5650d22 100644
--- a/src/render.server.tsx
+++ b/src/render.server.tsx
@@ -28,6 +28,11 @@ export class GameRenderer {
     const engine = i.get(EngineService);
     const zeit = engine.time;
     const empire = engine.empire;
+    // TODO? empire.update(zeit.tick)
+    for (const entity of empire.entities) {
+      entity.update(zeit.tick);
+    }
+    // console.log('Render', zeit.tick, empire.toString());
 
     return htmlFrame
       .replace(GameRenderer.TITLE_PLACEHOLDER, title)
diff --git a/src/server.ts b/src/server.ts
index 54fda3b..6ad30d8 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -7,7 +7,6 @@ import './html.element.server';
 import { defaultLang, Language } from './app/i18n';
 import { GameRenderer } from './render.server';
 import { EngineService, startup } from './engine.server';
-import { DataService } from './data.server';
 
 const isProd = process.env['NODE_ENV'] === 'production';
 const distFolder = process.env['BUILD_DIR'] || 'dist/phlame';
@@ -44,7 +43,22 @@ async function sessionHelper(engine: EngineService, ctx: Context) {
 
 const app = new Hono()
   .use('/assets/*', serveStatic({ root: isProd ? `${distFolder}/` : './' })) // path must end with '/'
-  .get('/sum', (c) => c.html('<h1>Sum sum</h1>'));
+  .get('/sum', async (c) => {
+    const engine = engineInjector.get(EngineService);
+    const lang = (getCookie(c, 'lang') as Language) || defaultLang;
+    const sid = getCookie(c, 'sid');
+    if (sid) {
+      const code = await engine.load(sid);
+      // TODO engine.save
+      if (0 !== code) {
+        c.status(code >= 200 ? code : 500);
+        return c.html(`<h1>Ouch, Error: ${code}</h1>`);
+      }
+      // TODO engine.update&save()
+      // but it's actually not worth updating the snapshot as long as nothing changed besides the tick
+    }
+    return c.html(`<h1>Sum sum ${engine.time.tick}</h1>`);
+  });
 
 const { createRoutes } = await import('./routes');
 createRoutes(app);