diff --git a/QWEN.md b/QWEN.md
index ceeda0d..b1272e6 100644
--- a/QWEN.md
+++ b/QWEN.md
@@ -17,113 +17,6 @@
 `boardgame-core`的内容可以在`framework/node_modules/boardgame-core`找到。
 这个文件夹被.gitignore忽略，查看时需要绕开这一限制。
 
-## 编写GameModule
-
-游戏逻辑以GameModule的形式定义：
-
-```typescript
-import {createGameCommandRegistry, IGameContext} from "boardgame-core";
-
-// 创建mutative游戏初始状态
-export function createInitialState(): GameState {
-    //...
-}
-
-// 运行游戏
-export async function start(game: IGameContext<GameState>) {
-    // ...
-}
-
-// 可选
-export const registry = createGameCommandRegistry();
-```
-
-使用以下步骤创建GameModule：
-
-### 1. 定义状态
-
-通常使用一个`regions: Record<string, Region>`和一个`parts: Record<string, Part<TMeta>>`来记录桌游物件的摆放。
-
-```typescript
-import {Region} from "boardgame-core";
-
-type GameState = {
-    regions: {
-        white: Region,
-        black: Region,
-        board: Region,
-    },
-    pieces: Record<string, Part<PartsTable['0']>>,
-    currentPlayer: PlayerType,
-    winner: WinnerType,
-};
-```
-
-游戏的部件可以从`csv`加载。详情见`boop-game/node_modules/inline-schema/`。
-```
-/// parts.csv
-type, player, count
-string, string, number
-cat, white, 8
-cat, black, 8
-
-/// parts.csv.d.ts
-type PartsTable = {
-    type: string;
-    player: string;
-    count: number;
-  }[];
-
-declare const data: PartsTable;
-export default data;
-```
-
-### 2. 定义流程
-
-使用`async function start(game: IGameContext<GameState>)`作为入口。
-
-使用`game.value`读取游戏当前状态
-```typescript
-async function gameEnd(game: IGameContext<GameState>) {
-    return game.value.winner;
-}
-```
-
-需要修改状态时，使用`game.produce`或`game.produceAsync`。
-
-```typescript
-async function start(game: IGameContext<GameState>) {
-    await game.produceAsync(state => {
-        state.currentPlayer = 'white';
-    });
-}
-```
-
-需要等待玩家交互时，使用`await game.prompt(promptDef, validator, player)`。
-
-```typescript
-import {createPromptDef} from "boardgame-core";
-
-export const prompts = {
-    play: createPromptDef<[PlayerType, number, number]>('play <player> <row:number> <col:number>'),
-}
-
-async function turn(game: IGameContext<GameState>, currentPlayer: PlayerType) {
-    const {player, row, col} = await game.prompt(
-        prompts.play,
-        (player, row, col) => {
-            if (player !== currentPlayer)
-                throw `Wrong player!`
-            return {player, row, col};
-        }
-    )
-}
-```
-
-### 3. 编写测试
-
-使用`vitest`编写测试，测试应当使用`GameHost`来模拟游戏环境。
-
 ## 编写Phaser App
 
 使用`framework/src/ui/PhaserBridge`来创建Phaser App。
@@ -136,6 +29,9 @@ async function turn(game: IGameContext<GameState>, currentPlayer: PlayerType) {
 export class GameHost<TState extends Record<string, unknown>, TResult=unknown> {
     // 获取游戏状态的只读快照
     get state(): TState{}
+    // 获取随机数
+    get rng(): ReadonlyRNG{}
+
     // 运行状态
     readonly status: ReadonlySignal<GameHostStatus>;
 
@@ -151,7 +47,7 @@ export class GameHost<TState extends Record<string, unknown>, TResult=unknown> {
     addInterruption(promise: Promise<void>): void {}
     
     // 开始或者重新开始游戏
-    start(): Promise<TResult>{}
+    start(seed?: number): Promise<TResult>{}
     
     // 销毁
     dispose(): void {}
diff --git a/docs/GameModule.md b/docs/GameModule.md
new file mode 100644
index 0000000..61ca864
--- /dev/null
+++ b/docs/GameModule.md
@@ -0,0 +1,107 @@
+## 编写GameModule
+
+游戏逻辑以GameModule的形式定义：
+
+```typescript
+import {createGameCommandRegistry, IGameContext} from "boardgame-core";
+
+// 创建mutative游戏初始状态
+export function createInitialState(): GameState {
+    //...
+}
+
+// 运行游戏
+export async function start(game: IGameContext<GameState>) {
+    // ...
+}
+
+// 可选
+export const registry = createGameCommandRegistry();
+```
+
+使用以下步骤创建GameModule：
+
+### 1. 定义状态
+
+通常使用一个`regions: Record<string, Region>`和一个`parts: Record<string, Part<TMeta>>`来记录桌游物件的摆放。
+
+```typescript
+import {Region} from "boardgame-core";
+
+type GameState = {
+    regions: {
+        white: Region,
+        black: Region,
+        board: Region,
+    },
+    pieces: Record<string, Part<PartsTable['0']>>,
+    currentPlayer: PlayerType,
+    winner: WinnerType,
+};
+```
+
+游戏的部件可以从`csv`加载。详情见`boop-game/node_modules/inline-schema/`。
+```
+/// parts.csv
+type, player, count
+string, string, number
+cat, white, 8
+cat, black, 8
+
+/// parts.csv.d.ts
+type PartsTable = {
+    type: string;
+    player: string;
+    count: number;
+  }[];
+
+declare const data: PartsTable;
+export default data;
+```
+
+### 2. 定义流程
+
+使用`async function start(game: IGameContext<GameState>)`作为入口。
+
+使用`game.value`读取游戏当前状态
+```typescript
+async function gameEnd(game: IGameContext<GameState>) {
+    return game.value.winner;
+}
+```
+
+需要修改状态时，使用`game.produce`或`game.produceAsync`。
+
+```typescript
+async function start(game: IGameContext<GameState>) {
+    await game.produceAsync(state => {
+        state.currentPlayer = 'white';
+    });
+}
+```
+
+需要等待玩家交互时，使用`await game.prompt(promptDef, validator, player)`。
+
+```typescript
+import {createPromptDef} from "boardgame-core";
+
+export const prompts = {
+    play: createPromptDef<[PlayerType, number, number]>('play <player> <row:number> <col:number>'),
+}
+
+async function turn(game: IGameContext<GameState>, currentPlayer: PlayerType) {
+    const {player, row, col} = await game.prompt(
+        prompts.play,
+        (player, row, col) => {
+            if (player !== currentPlayer)
+                throw `Wrong player!`
+            return {player, row, col};
+        }
+    )
+}
+```
+
+### 3. 编写测试
+
+使用`vitest`编写测试，测试应当使用`GameHost`来模拟游戏环境。
+