diff --git a/docs/superpowers/plans/2026-03-29-gift-zone-cityteam-mashup.md b/docs/superpowers/plans/2026-03-29-gift-zone-cityteam-mashup.md
new file mode 100644
index 0000000..ad78726
--- /dev/null
+++ b/docs/superpowers/plans/2026-03-29-gift-zone-cityteam-mashup.md
@@ -0,0 +1,67 @@
+# Gift Zone CityTeam Mashup Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add the MVP cat album and local cityTeam entry flow, then wire the mashup home tile into a playable standalone round with local rewards.
+
+**Architecture:** Extend the existing `contentSystem` and `scene-store` contracts instead of refactoring core navigation. Reuse the current gameplay session for mashup by feeding it generated board metadata and handling mashup completion in a separate local reward path.
+
+**Tech Stack:** ES modules, Node test runner, WeChat mini-game canvas shell
+
+---
+
+### Task 1: Docs And Data Contracts
+
+**Files:**
+- Create: `docs/superpowers/specs/2026-03-29-gift-zone-cityteam-mashup-design.md`
+- Create: `docs/superpowers/plans/2026-03-29-gift-zone-cityteam-mashup.md`
+- Modify: `js/content/index.js`
+
+- [ ] Define the MVP cat album contract in `contentSystem`
+- [ ] Keep `animals` and `maps` out of scope
+- [ ] Add any helper projections needed for cityTeam and mashup
+
+### Task 2: Gift Zone And CityTeam
+
+**Files:**
+- Modify: `tests/content-system.test.js`
+- Modify: `tests/scene-store.test.js`
+- Modify: `js/content/index.js`
+- Modify: `js/ui/scene-store.js`
+- Modify: `js/main.js`
+
+- [ ] Write failing tests for `cats` album visibility and counts
+- [ ] Write failing tests for cityTeam selection flow
+- [ ] Implement `cats` album projections with existing city cat data
+- [ ] Implement `city-team-select` scene and local selection writeback
+- [ ] Render cityTeam status and entry buttons in the canvas UI
+- [ ] Re-run targeted tests until green
+
+### Task 3: Mashup Gameplay
+
+**Files:**
+- Modify: `tests/difficulty-generator.test.js`
+- Modify: `tests/scene-store.test.js`
+- Modify: `js/gameplay/difficulty/generate-board.js`
+- Create: `js/gameplay/difficulty/generate-mashup-board.js`
+- Modify: `js/gameplay/difficulty/index.js`
+- Modify: `js/gameplay/session/index.js`
+- Modify: `js/ui/scene-store.js`
+- Modify: `js/main.js`
+
+- [ ] Write failing tests for mashup board generation
+- [ ] Write failing tests for mashup scene entry and reward writeback
+- [ ] Implement mashup board builder from unlocked city content
+- [ ] Implement mashup scene/session creation in `scene-store`
+- [ ] Implement mashup win reward path and result messaging
+- [ ] Re-run targeted tests until green
+
+### Task 4: Full Verification
+
+**Files:**
+- Modify: `tests/*` as needed
+- Modify: `js/*` as needed
+
+- [ ] Run the full test suite with `npm test`
+- [ ] Verify no unrelated placeholders were implemented
+- [ ] Summarize remaining placeholder areas in the final report
diff --git a/docs/superpowers/specs/2026-03-29-gift-zone-cityteam-mashup-design.md b/docs/superpowers/specs/2026-03-29-gift-zone-cityteam-mashup-design.md
new file mode 100644
index 0000000..4d9a9a9
--- /dev/null
+++ b/docs/superpowers/specs/2026-03-29-gift-zone-cityteam-mashup-design.md
@@ -0,0 +1,92 @@
+# Gift Zone CityTeam Mashup Design
+
+## Goal
+
+在现有 MVP 壳子上补齐三个紧邻切片：
+
+- 礼物区从 2 册扩到 3 册，先把 `猫猫册` 做成可浏览的 MVP 版本
+- 接通本地 `cityTeam` 选队入口，只做本地选择和展示，不做服务端排行
+- 把 `主题大混战` 做成可进入的独立对局，并提供本地奖励回写
+
+## Scope
+
+### In
+
+- `gift-zone` 增加 `cats` tab 和汇总计数
+- `cityTeam` 选择页、本地入队状态、入口按钮
+- `mashup` 入口从首页可进入独立对局
+- `mashup` 使用已解锁城市元素混搭生成棋盘
+- `mashup` 通关奖励写回本地存档
+
+### Out
+
+- 真正的分享卡片视觉内容
+- 开房 PK
+- 城市战队排行榜服务端逻辑
+- 礼物区 `动物册 / 地图册`
+- 地区级猫猫收集规则
+
+## Design Decisions
+
+### 1. 猫猫册口径
+
+先用“已通关城市猫”作为 `猫猫册` MVP 口径，而不是文档里的“地区猫”正式口径。
+
+原因：
+
+- 现有存档里已经有 `collectedCats[]` 城市完成态
+- 现有 CityManifest 已经有 `cat` 和 `cover.catThumb`
+- 这样可以不引入新资源、不改通关发奖链路
+
+后续若升级为“地区猫”，只需要替换 `cats` album 的数据投影层，不必重写礼物区 UI 框架。
+
+### 2. cityTeam 入口
+
+`cityTeam` 入口同时挂在两个地方：
+
+- 礼物区顶部信息卡
+- 主页右侧“排行榜”卡片
+
+如果未选队，进入 `city-team-select` 选择页；如果已选队，则展示当前所属战队的本地状态说明。选择仅允许已解锁城市，首次选择后本地锁定。
+
+### 3. 主题大混战实现方式
+
+不把 `mashup` 硬塞进现有城市关卡合同，而是新增一条轻量 mode 路径：
+
+- `scene-store` 增加 `mashup` scene
+- 生成器增加 mashup board 构建辅助函数
+- `gameplay` 复用现有 `GameSession`
+- `main.js` 根据 scene metadata 渲染 mashup 标题、结果和奖励文案
+
+这样不需要把 `contentSystem.getCity()` 改成兼容“虚拟城市”，能控制改动面。
+
+### 4. 混战奖励
+
+混战不计入城市关卡进度。通关奖励规则：
+
+- 优先随机发一个当前已解锁城市的冰箱贴
+- 如果随机命中的冰箱贴已拥有，则发 `shuffle +1`
+
+奖励完全本地化，只做存档回写和结果展示。
+
+## Data Flow
+
+### Gift Zone
+
+`playerState` -> `contentSystem.getGiftAlbums()` / `getGiftAlbumEntries()` -> `scene-store gift-zone` -> `main.js` 礼物区页面
+
+### CityTeam
+
+`playerState.cityTeam` -> `scene-store` 入口判断 / 选择写回 -> `main.js` 选择页与状态卡
+
+### Mashup
+
+首页 `mashup` tile -> `scene-store.openHomeTile('mashup')` -> 构建 mashup board + session -> `main.js` gameplay -> 通关后 `scene-store.completeMashupRun()`
+
+## Testing
+
+- 内容系统测试：礼物区 album 列表包含 `cats`，计数与条目投影正确
+- scene-store 测试：cityTeam 选择页可打开、可选择、选后锁定
+- scene-store 测试：`mashup` 在通关 2 城后可进入
+- 对局/难度测试：mashup board 由多个城市元素组成且可复现
+- scene-store 测试：mashup 通关可写入奖励
diff --git a/js/content/index.js b/js/content/index.js
index ce47eff..ad9c12b 100644
--- a/js/content/index.js
+++ b/js/content/index.js
@@ -44,6 +44,7 @@ export function createContentSystem() {
   const giftAlbumDefinitions = [
     { id: 'magnets', name: '冰箱贴册' },
     { id: 'stamps', name: '邮票册' },
+    { id: 'cats', name: '猫猫册' },
   ]
 
   function getCompletedCityCount(playerState) {
@@ -115,6 +116,35 @@ export function createContentSystem() {
     })
   }
 
+  function getCatEntries(playerState) {
+    const collectedCats = new Set(playerState.collectedCats ?? [])
+
+    return cityRegistry.getAllCities().map((city) => ({
+      cityId: city.id,
+      cityName: city.display.name,
+      cityNameEn: city.display.nameEn,
+      themeColor: city.display.bgColor,
+      catId: city.cat.id,
+      catName: city.cat.name,
+      catThumb: city.cover.catThumb,
+      isCollected: collectedCats.has(city.id),
+    }))
+  }
+
+  function summarizeAlbumEntries(albumId, entries) {
+    if (albumId === 'magnets') {
+      return {
+        collectedCount: entries.reduce((sum, entry) => sum + entry.collectedCount, 0),
+        totalCount: entries.reduce((sum, entry) => sum + entry.totalCount, 0),
+      }
+    }
+
+    return {
+      collectedCount: entries.filter((entry) => entry.isCollected).length,
+      totalCount: entries.length,
+    }
+  }
+
   function getGiftAlbumEntries(albumId, playerState) {
     if (albumId === 'magnets') {
       return getMagnetEntries(playerState)
@@ -124,23 +154,22 @@ export function createContentSystem() {
       return getStampEntries(playerState)
     }
 
+    if (albumId === 'cats') {
+      return getCatEntries(playerState)
+    }
+
     return []
   }
 
   function getGiftAlbums(playerState) {
     return giftAlbumDefinitions.map((definition) => {
       const entries = getGiftAlbumEntries(definition.id, playerState)
-      const collectedCount = definition.id === 'magnets'
-        ? entries.reduce((sum, entry) => sum + entry.collectedCount, 0)
-        : entries.filter((entry) => entry.isCollected).length
-      const totalCount = definition.id === 'magnets'
-        ? entries.reduce((sum, entry) => sum + entry.totalCount, 0)
-        : entries.length
+      const summary = summarizeAlbumEntries(definition.id, entries)
 
       return {
         ...definition,
-        collectedCount,
-        totalCount,
+        collectedCount: summary.collectedCount,
+        totalCount: summary.totalCount,
       }
     })
   }
diff --git a/js/gameplay/difficulty/generate-board.js b/js/gameplay/difficulty/generate-board.js
index 1f36b5d..3b83b9b 100644
--- a/js/gameplay/difficulty/generate-board.js
+++ b/js/gameplay/difficulty/generate-board.js
@@ -105,6 +105,38 @@ function placePieces(piecePool, levelPreset, rng) {
   return placedPieces
 }
 
+export function generateBoardFromDefinition({
+  boardId,
+  cityId,
+  levelId,
+  seed,
+  elements,
+  levelPreset,
+  extraState = {},
+}) {
+  const effectiveSeed = seed ?? levelPreset.seedBase
+  const rng = createRng(effectiveSeed)
+  const selectedElements = [...elements]
+  const counts = normalizePiecesPerElement(levelPreset.piecesPerElement, levelPreset.elementCount)
+  const piecePool = createPiecePool(selectedElements, counts)
+  const pieces = placePieces(shuffleWithRng(piecePool, rng), levelPreset, rng)
+  const overlapGraph = buildOverlapGraph(pieces)
+  const boardState = {
+    boardId: boardId ?? `${cityId}-${levelId}-${effectiveSeed}`,
+    cityId,
+    levelId,
+    seed: effectiveSeed,
+    pieces,
+    overlapGraph,
+    metrics: {},
+    ...extraState,
+  }
+
+  boardState.metrics = evaluateBoard(boardState, levelPreset)
+
+  return boardState
+}
+
 export function generateBoard({ cityId, levelId, seed, contentSystem }) {
   const city = contentSystem.getCity(cityId)
   const levelPreset = contentSystem.getLevelPreset(cityId, levelId)
@@ -116,23 +148,14 @@ export function generateBoard({ cityId, levelId, seed, contentSystem }) {
   const effectiveSeed = seed ?? levelPreset.seedBase
   const rng = createRng(effectiveSeed)
   const selectedElements = pickElements(city, levelPreset, rng)
-  const counts = normalizePiecesPerElement(levelPreset.piecesPerElement, levelPreset.elementCount)
-  const piecePool = createPiecePool(selectedElements, counts)
-  const pieces = placePieces(shuffleWithRng(piecePool, rng), levelPreset, rng)
-  const overlapGraph = buildOverlapGraph(pieces)
-  const boardState = {
-    boardId: `${cityId}-${levelId}-${effectiveSeed}`,
+
+  return generateBoardFromDefinition({
     cityId,
     levelId,
     seed: effectiveSeed,
-    pieces,
-    overlapGraph,
-    metrics: {},
-  }
-
-  boardState.metrics = evaluateBoard(boardState, levelPreset)
-
-  return boardState
+    elements: selectedElements,
+    levelPreset,
+  })
 }
 
 export default generateBoard
diff --git a/js/gameplay/difficulty/generate-mashup-board.js b/js/gameplay/difficulty/generate-mashup-board.js
new file mode 100644
index 0000000..0ad6a8b
--- /dev/null
+++ b/js/gameplay/difficulty/generate-mashup-board.js
@@ -0,0 +1,99 @@
+import { generateBoardFromDefinition } from './generate-board.js'
+import { createRng, shuffleWithRng } from './random.js'
+
+function createMashupLevelPreset(elementCount) {
+  return {
+    id: 1,
+    seedBase: 31001,
+    elementCount,
+    piecesPerElement: Array.from({ length: elementCount }, () => 3),
+    layers: 4,
+    density: 'medium_high',
+  }
+}
+
+function getSourceCities(cityIds, contentSystem) {
+  return cityIds
+    .map((cityId) => contentSystem.getCity(cityId))
+    .filter(Boolean)
+}
+
+function createCityElementPools(cities, rng) {
+  return cities.map((city) => ({
+    cityId: city.id,
+    cursor: 0,
+    elements: shuffleWithRng(
+      city.elements.map((element) => ({
+        ...element,
+        sourceCityId: city.id,
+        sourceCityName: city.display.name,
+      })),
+      rng,
+    ),
+  }))
+}
+
+function pickMashupElements(cities, targetCount, rng) {
+  const pools = createCityElementPools(cities, rng)
+  const selected = []
+
+  while (selected.length < targetCount) {
+    let didAdd = false
+
+    for (const pool of pools) {
+      const element = pool.elements[pool.cursor]
+      if (!element) {
+        continue
+      }
+
+      selected.push(element)
+      pool.cursor += 1
+      didAdd = true
+
+      if (selected.length === targetCount) {
+        break
+      }
+    }
+
+    if (!didAdd) {
+      break
+    }
+  }
+
+  return selected
+}
+
+export function generateMashupBoard({ cityIds, seed, contentSystem }) {
+  const cities = getSourceCities(cityIds, contentSystem)
+
+  if (cities.length === 0) {
+    throw new Error('Mashup mode requires at least one source city')
+  }
+
+  const effectiveSeed = seed ?? 31001
+  const rng = createRng(effectiveSeed)
+  const maxElementCount = cities.reduce((sum, city) => sum + city.elements.length, 0)
+  const elementCount = Math.min(8, maxElementCount)
+  const levelPreset = createMashupLevelPreset(elementCount)
+  const selectedElements = pickMashupElements(cities, elementCount, rng)
+
+  return generateBoardFromDefinition({
+    boardId: `mashup-${effectiveSeed}`,
+    cityId: 'mashup',
+    levelId: 1,
+    seed: effectiveSeed,
+    elements: selectedElements,
+    levelPreset,
+    extraState: {
+      sourceCityIds: cities.map((city) => city.id),
+      elementDefinitions: selectedElements.map((element) => ({
+        elementId: element.id,
+        name: element.name,
+        sourceCityId: element.sourceCityId,
+        sourceCityName: element.sourceCityName,
+      })),
+    },
+  })
+}
+
+export default generateMashupBoard
diff --git a/js/gameplay/difficulty/index.js b/js/gameplay/difficulty/index.js
index 7446f59..d3f76fd 100644
--- a/js/gameplay/difficulty/index.js
+++ b/js/gameplay/difficulty/index.js
@@ -1,6 +1,7 @@
 export { classifyDeadlock } from './classify-deadlock.js'
 export { evaluateBoard } from './evaluate-board.js'
 export { generateBoard } from './generate-board.js'
+export { generateMashupBoard } from './generate-mashup-board.js'
 export {
   buildOverlapGraph,
   getClickablePieces,
diff --git a/js/gameplay/session/index.js b/js/gameplay/session/index.js
index 1dcf2c2..3c198e2 100644
--- a/js/gameplay/session/index.js
+++ b/js/gameplay/session/index.js
@@ -65,6 +65,7 @@ export function createGameSession({
   seed,
   contentSystem,
   boardState,
+  restartFactory,
 }) {
   const resolvedBoard = boardState ? cloneBoardState(boardState) : generateBoard({ cityId, levelId, seed, contentSystem })
   const state = {
@@ -160,6 +161,10 @@ export function createGameSession({
   }
 
   function restart(nextSeed = seed ?? resolvedBoard.seed) {
+    if (restartFactory) {
+      return restartFactory(nextSeed)
+    }
+
     const freshSession = createGameSession({
       cityId,
       levelId,
diff --git a/js/main.js b/js/main.js
index 9c773bc..0e6946c 100644
--- a/js/main.js
+++ b/js/main.js
@@ -223,10 +223,15 @@ function drawSidebarCard({ x, y, width, height, titleLines, subtitle, onTap, acc
 }
 
 function drawHomeScene() {
+  const playerStateSnapshot = sceneStore.getPlayerState()
   drawHeader('城市抓猫猫', '世界主页面 · 3×3 入口')
 
-  const homeTiles = contentSystem.getHomeTiles(sceneStore.getPlayerState())
-  const playerGiftAlbums = contentSystem.getGiftAlbums(sceneStore.getPlayerState())
+  const homeTiles = contentSystem.getHomeTiles(playerStateSnapshot)
+  const playerGiftAlbums = contentSystem.getGiftAlbums(playerStateSnapshot)
+  const teamCity = playerStateSnapshot.cityTeam?.teamCityId
+    ? contentSystem.getCity(playerStateSnapshot.cityTeam.teamCityId)
+    : null
+  const totalGiftCount = playerGiftAlbums.reduce((sum, album) => sum + album.collectedCount, 0)
   const sidebarWidth = Math.max(58, Math.min(70, Math.floor(windowWidth * 0.18)))
   const sidebarGap = 8
   const centerX = 24 + sidebarWidth + sidebarGap
@@ -270,7 +275,7 @@ function drawHomeScene() {
     width: sidebarWidth,
     height: cardHeight,
     titleLines: ['礼物', '区'],
-    subtitle: `${playerGiftAlbums[0].collectedCount + playerGiftAlbums[1].collectedCount} 个收藏`,
+    subtitle: `${totalGiftCount} 个收藏`,
     accentColor: '#26A69A',
     onTap() {
       sceneStore.openGiftZone()
@@ -284,10 +289,10 @@ function drawHomeScene() {
     width: sidebarWidth,
     height: cardHeight,
     titleLines: ['排行', '榜'],
-    subtitle: '城市战队',
+    subtitle: teamCity ? `${teamCity.display.name} 战队` : '选择战队',
     accentColor: '#42A5F5',
     onTap() {
-      showTransientMessage('城市排行榜依赖服务端，V1.1+ 接入')
+      sceneStore.openCityTeamSelect()
       render()
     },
   })
@@ -483,8 +488,11 @@ function drawGiftZoneScene(scene) {
   const playerStateSnapshot = sceneStore.getPlayerState()
   const albums = contentSystem.getGiftAlbums(playerStateSnapshot)
   const entries = contentSystem.getGiftAlbumEntries(scene.selectedTab, playerStateSnapshot)
+  const teamCity = playerStateSnapshot.cityTeam?.teamCityId
+    ? contentSystem.getCity(playerStateSnapshot.cityTeam.teamCityId)
+    : null
 
-  drawHeader('城市主题礼物区', 'MVP 收集册 · 冰箱贴 / 邮票')
+  drawHeader('城市主题礼物区', 'MVP 收集册 · 冰箱贴 / 邮票 / 猫猫')
 
   const summaryX = 24
   const summaryY = 92
@@ -507,8 +515,50 @@ function drawGiftZoneScene(scene) {
     summaryY + summaryHeight / 2,
   )
 
-  const tabWidth = (windowWidth - 24 * 2 - 12) / 2
-  const tabsY = 158
+  const teamCardY = 156
+  const teamCardHeight = 58
+
+  ctx.fillStyle = '#ffffff'
+  ctx.strokeStyle = teamCity ? teamCity.display.bgColor : '#8aa3ff'
+  ctx.lineWidth = 2
+  drawRoundedRect(summaryX, teamCardY, summaryWidth, teamCardHeight, 16)
+  ctx.fill()
+  ctx.stroke()
+
+  ctx.fillStyle = '#231f2a'
+  ctx.font = 'bold 15px sans-serif'
+  ctx.textAlign = 'left'
+  ctx.fillText(
+    teamCity ? `${teamCity.display.name} 战队` : '还没加入城市战队',
+    summaryX + 16,
+    teamCardY + 22,
+  )
+
+  ctx.fillStyle = '#6b6474'
+  ctx.font = '12px sans-serif'
+  ctx.fillText(
+    teamCity ? '本地已锁定，排行榜继续占位' : '先选已解锁城市，本地状态先走通',
+    summaryX + 16,
+    teamCardY + 42,
+  )
+
+  drawButton({
+    x: summaryX + summaryWidth - 116,
+    y: teamCardY + 12,
+    width: 100,
+    height: 34,
+    label: teamCity ? '查看战队' : '选择战队',
+    onTap() {
+      sceneStore.openCityTeamSelect()
+      render()
+    },
+    fillStyle: teamCity ? teamCity.display.bgColor : '#231f2a',
+    textColor: '#ffffff',
+  })
+
+  const tabGap = 12
+  const tabWidth = (windowWidth - 24 * 2 - tabGap * (albums.length - 1)) / albums.length
+  const tabsY = 228
 
   albums.forEach((album, index) => {
     drawButton({
@@ -529,7 +579,7 @@ function drawGiftZoneScene(scene) {
   const columns = 2
   const cardWidth = (windowWidth - 24 * 2 - 14) / columns
   const cardHeight = 82
-  const startY = 216
+  const startY = 286
 
   entries.forEach((entry, index) => {
     const row = Math.floor(index / columns)
@@ -553,8 +603,10 @@ function drawGiftZoneScene(scene) {
     ctx.font = '13px sans-serif'
     if (scene.selectedTab === 'magnets') {
       ctx.fillText(`冰箱贴 ${entry.collectedCount}/${entry.totalCount}`, x + 16, y + 52)
-    } else {
+    } else if (scene.selectedTab === 'stamps') {
       ctx.fillText(entry.isCollected ? '邮票已收集' : '邮票未收集', x + 16, y + 52)
+    } else {
+      ctx.fillText(entry.isCollected ? `${entry.catName} 已收集` : '通关城市后收集', x + 16, y + 52)
     }
   })
 
@@ -564,8 +616,73 @@ function drawGiftZoneScene(scene) {
   })
 }
 
+function drawCityTeamSelectScene(scene) {
+  const isLocked = Boolean(scene.selectedTeamCityId)
+  const selectedCity = isLocked ? contentSystem.getCity(scene.selectedTeamCityId) : null
+
+  drawHeader(
+    '选择城市战队',
+    selectedCity ? `当前所属 ${selectedCity.display.name} 战队 · 本地先锁定` : '从已解锁城市里选择一个战队',
+  )
+
+  const columns = 2
+  const cardWidth = (windowWidth - 24 * 2 - 14) / columns
+  const cardHeight = 94
+  const startY = 104
+
+  scene.options.forEach((entry, index) => {
+    const row = Math.floor(index / columns)
+    const column = index % columns
+    const x = 24 + column * (cardWidth + 14)
+    const y = startY + row * (cardHeight + 12)
+    const isSelected = scene.selectedTeamCityId === entry.cityId
+
+    ctx.fillStyle = '#ffffff'
+    ctx.strokeStyle = entry.themeColor
+    ctx.lineWidth = 2
+    drawRoundedRect(x, y, cardWidth, cardHeight, 16)
+    ctx.fill()
+    ctx.stroke()
+
+    ctx.fillStyle = entry.themeColor
+    ctx.font = 'bold 18px sans-serif'
+    ctx.textAlign = 'left'
+    ctx.fillText(entry.cityName, x + 16, y + 24)
+
+    ctx.fillStyle = '#6b6474'
+    ctx.font = '13px sans-serif'
+    ctx.fillText(`猫猫 ${entry.catName}`, x + 16, y + 48)
+    ctx.fillText(isSelected ? '已加入，当前不可更换' : '可加入本地战队', x + 16, y + 72)
+
+    registerHitTarget({
+      x,
+      y,
+      width: cardWidth,
+      height: cardHeight,
+      onTap() {
+        const selected = sceneStore.chooseCityTeam(entry.cityId)
+        if (selected) {
+          savePlayerState()
+          showTransientMessage(`已加入 ${entry.cityName} 战队`)
+        } else if (isLocked) {
+          showTransientMessage('当前版本先锁定首次选队')
+        } else {
+          showTransientMessage('只能选择已解锁城市')
+        }
+        render()
+      },
+    })
+  })
+
+  drawBackButton(() => {
+    sceneStore.goBack()
+    render()
+  })
+}
+
 function drawGameplayScene(scene) {
-  const city = contentSystem.getCity(scene.cityId)
+  const isMashup = scene.mode === 'mashup'
+  const city = isMashup ? null : contentSystem.getCity(scene.cityId)
   const session = scene.session
   const boardState = session.getBoardState()
   const state = session.getState()
@@ -573,10 +690,15 @@ function drawGameplayScene(scene) {
   const activePieces = boardState.pieces
     .filter((piece) => !piece.removed)
     .sort((left, right) => left.layer - right.layer)
+  const elementNameMap = isMashup
+    ? new Map(scene.elementDefinitions.map((element) => [element.elementId, element.name]))
+    : new Map(city.elements.map((element) => [element.id, element.name]))
+  const title = isMashup ? scene.title : `${city.display.name} · 关卡 ${scene.levelId}`
+  const subtitle = isMashup
+    ? `${scene.subtitle ?? '随机混搭'} · ${state.slot.length}/7 槽位`
+    : `${state.slot.length}/7 槽位`
 
-  const elementNameMap = new Map(city.elements.map((element) => [element.id, element.name]))
-
-  drawHeader(`${city.display.name} · 关卡 ${scene.levelId}`, `${state.slot.length}/7 槽位`)
+  drawHeader(title, subtitle)
 
   drawButton({
     x: windowWidth - 112,
@@ -624,11 +746,7 @@ function drawGameplayScene(scene) {
           const result = session.pickPiece(piece.id)
 
           if (result.status === 'won') {
-            sceneStore.completeLevel({
-              cityId: scene.cityId,
-              levelId: scene.levelId,
-              stars: 3,
-            })
+            sceneStore.completeGameplayVictory(3)
             savePlayerState()
           }
 
@@ -668,11 +786,29 @@ function drawGameplayScene(scene) {
   })
 
   if (state.status === 'won' || state.status === 'failed') {
-    drawResultOverlay(state.status, city.display.bgColor)
+    drawResultOverlay(scene, state.status, isMashup ? scene.accentColor : city.display.bgColor)
   }
 }
 
-function drawResultOverlay(status, accentColor) {
+function drawResultOverlay(scene, status, accentColor) {
+  const isMashup = scene.mode === 'mashup'
+  const rewardSummary = scene.rewardSummary
+  const title = status === 'won' ? '通关成功' : '挑战失败'
+  let detail = '可以重开当前关卡，继续测试核心循环'
+
+  if (status === 'won' && isMashup) {
+    if (rewardSummary?.type === 'magnet') {
+      const rewardCity = contentSystem.getCity(rewardSummary.cityId)
+      detail = `奖励：${rewardCity?.display.name ?? rewardSummary.cityId} 冰箱贴 ${rewardSummary.levelId}`
+    } else if (rewardSummary?.type === 'inventory') {
+      detail = '奖励：Shuffle +1'
+    } else {
+      detail = '已结算本地混战奖励'
+    }
+  } else if (status === 'won') {
+    detail = '已记录进度，返回关卡页继续'
+  }
+
   ctx.fillStyle = 'rgba(35, 31, 42, 0.45)'
   ctx.fillRect(0, 0, windowWidth, windowHeight)
 
@@ -691,22 +827,18 @@ function drawResultOverlay(status, accentColor) {
   ctx.fillStyle = '#231f2a'
   ctx.font = 'bold 28px sans-serif'
   ctx.textAlign = 'center'
-  ctx.fillText(status === 'won' ? '通关成功' : '挑战失败', x + boxWidth / 2, y + 48)
+  ctx.fillText(title, x + boxWidth / 2, y + 48)
 
   ctx.fillStyle = '#6b6474'
   ctx.font = '15px sans-serif'
-  ctx.fillText(
-    status === 'won' ? '已记录进度，返回关卡页继续' : '可以重开当前关卡，继续测试核心循环',
-    x + boxWidth / 2,
-    y + 86,
-  )
+  ctx.fillText(detail, x + boxWidth / 2, y + 86)
 
   drawButton({
     x: x + 20,
     y: y + 120,
     width: (boxWidth - 50) / 2,
     height: 42,
-    label: status === 'won' ? '返回关卡' : '返回',
+    label: status === 'won' ? (isMashup ? '返回主页' : '返回关卡') : '返回',
     onTap() {
       sceneStore.goBack()
       render()
@@ -720,10 +852,14 @@ function drawResultOverlay(status, accentColor) {
     y: y + 120,
     width: (boxWidth - 50) / 2,
     height: 42,
-    label: status === 'won' ? '下一步再做' : '重新挑战',
+    label: status === 'won' ? (isMashup ? '再来一局' : '下一步再做') : '重新挑战',
     onTap() {
       if (status === 'won') {
-        sceneStore.goBack()
+        if (isMashup) {
+          sceneStore.restartCurrentLevel()
+        } else {
+          sceneStore.goBack()
+        }
       } else {
         sceneStore.restartCurrentLevel()
       }
@@ -786,6 +922,12 @@ function render() {
     return
   }
 
+  if (scene.type === 'city-team-select') {
+    drawCityTeamSelectScene(scene)
+    drawTransientMessage()
+    return
+  }
+
   if (scene.type === 'gameplay') {
     drawGameplayScene(scene)
     drawTransientMessage()
diff --git a/js/ui/scene-store.js b/js/ui/scene-store.js
index 98bcbce..2a012d2 100644
--- a/js/ui/scene-store.js
+++ b/js/ui/scene-store.js
@@ -1,4 +1,5 @@
 import { createGameSession } from '../gameplay/session/index.js'
+import { generateMashupBoard } from '../gameplay/difficulty/index.js'
 
 function createHomeSelectScene() {
   return {
@@ -20,6 +21,41 @@ function createGiftZoneScene(selectedTab = 'magnets') {
   }
 }
 
+function createCityTeamSelectScene(options, selectedTeamCityId) {
+  return {
+    type: 'city-team-select',
+    options,
+    selectedTeamCityId,
+  }
+}
+
+function createGameplayScene({
+  cityId,
+  levelId,
+  session,
+  mode = 'city',
+  title = null,
+  subtitle = null,
+  accentColor = null,
+  sourceCityIds = [],
+  elementDefinitions = [],
+  rewardSummary = null,
+}) {
+  return {
+    type: 'gameplay',
+    cityId,
+    levelId,
+    session,
+    mode,
+    title,
+    subtitle,
+    accentColor,
+    sourceCityIds,
+    elementDefinitions,
+    rewardSummary,
+  }
+}
+
 function createLevelProgress(city, playerState) {
   const cityProgress = playerState.levelProgress[city.id] ?? {}
 
@@ -57,6 +93,35 @@ function createAcquiredDate(now) {
   return new Date(now()).toISOString()
 }
 
+function createCityTeamOptions(contentSystem, playerState) {
+  return playerState.unlockedCities
+    .map((cityId) => {
+      const city = contentSystem.getCity(cityId)
+      if (!city) {
+        return null
+      }
+
+      return {
+        cityId: city.id,
+        cityName: city.display.name,
+        catName: city.cat.name,
+        themeColor: city.display.bgColor,
+      }
+    })
+    .filter(Boolean)
+}
+
+function createMashupRewardCandidates(contentSystem, playerState) {
+  return playerState.unlockedCities
+    .map((cityId) => contentSystem.getCity(cityId))
+    .filter(Boolean)
+    .flatMap((city) => city.levelPresets.map((preset) => ({
+      magnetId: `magnet_${city.id}_${preset.id}`,
+      cityId: city.id,
+      levelId: preset.id,
+    })))
+}
+
 function awardLevelMagnet(playerState, cityId, levelId, now) {
   const magnets = ensureCollection(playerState, 'collectedMagnets')
   const magnetId = `magnet_${cityId}_${levelId}`
@@ -73,6 +138,41 @@ function awardLevelMagnet(playerState, cityId, levelId, now) {
   })
 }
 
+function awardMashupReward(contentSystem, playerState, seed, now) {
+  const rewardCandidates = createMashupRewardCandidates(contentSystem, playerState)
+  const magnets = ensureCollection(playerState, 'collectedMagnets')
+
+  if (rewardCandidates.length === 0) {
+    playerState.inventory.shuffle = (playerState.inventory.shuffle ?? 0) + 1
+    return {
+      type: 'inventory',
+      itemId: 'shuffle',
+      amount: 1,
+    }
+  }
+
+  const reward = rewardCandidates[seed % rewardCandidates.length]
+
+  if (magnets.some((entry) => entry.magnetId === reward.magnetId)) {
+    playerState.inventory.shuffle = (playerState.inventory.shuffle ?? 0) + 1
+    return {
+      type: 'inventory',
+      itemId: 'shuffle',
+      amount: 1,
+    }
+  }
+
+  magnets.push({
+    ...reward,
+    acquiredDate: createAcquiredDate(now),
+  })
+
+  return {
+    type: 'magnet',
+    ...reward,
+  }
+}
+
 function markCityCompletion(contentSystem, playerState, cityId, now) {
   if (!playerState.collectedCats.includes(cityId)) {
     playerState.collectedCats.push(cityId)
@@ -105,6 +205,40 @@ export function createSceneStore({ contentSystem, playerState, now = () => Date.
   const history = []
   let currentScene = createHomeSelectScene()
 
+  function createMashupSession(seed = now()) {
+    const boardState = generateMashupBoard({
+      cityIds: playerState.unlockedCities,
+      seed,
+      contentSystem,
+    })
+
+    return createGameSession({
+      cityId: 'mashup',
+      levelId: 1,
+      seed,
+      contentSystem,
+      boardState,
+      restartFactory: (nextSeed) => createMashupSession(nextSeed),
+    })
+  }
+
+  function createMashupGameplayScene(seed = now()) {
+    const session = createMashupSession(seed)
+    const boardState = session.getBoardState()
+
+    return createGameplayScene({
+      cityId: 'mashup',
+      levelId: 1,
+      session,
+      mode: 'mashup',
+      title: '主题大混战',
+      subtitle: `${boardState.sourceCityIds.length} 城混搭`,
+      accentColor: '#E74C3C',
+      sourceCityIds: boardState.sourceCityIds ?? [],
+      elementDefinitions: boardState.elementDefinitions ?? [],
+    })
+  }
+
   function getScene() {
     return currentScene
   }
@@ -130,7 +264,9 @@ export function createSceneStore({ contentSystem, playerState, now = () => Date.
     }
 
     if (tile.id === 'mashup') {
-      return { opened: false, reason: 'mode-unavailable' }
+      history.push(currentScene)
+      currentScene = createMashupGameplayScene()
+      return { opened: true }
     }
 
     return { opened: false, reason: 'unavailable' }
@@ -167,7 +303,7 @@ export function createSceneStore({ contentSystem, playerState, now = () => Date.
       return false
     }
 
-    if (!['magnets', 'stamps'].includes(tabId)) {
+    if (!['magnets', 'stamps', 'cats'].includes(tabId)) {
       return false
     }
 
@@ -179,6 +315,40 @@ export function createSceneStore({ contentSystem, playerState, now = () => Date.
     return true
   }
 
+  function openCityTeamSelect() {
+    history.push(currentScene)
+    currentScene = createCityTeamSelectScene(
+      createCityTeamOptions(contentSystem, playerState),
+      playerState.cityTeam?.teamCityId ?? null,
+    )
+
+    return true
+  }
+
+  function chooseCityTeam(cityId) {
+    if (currentScene.type !== 'city-team-select') {
+      return false
+    }
+
+    if (playerState.cityTeam?.teamCityId) {
+      return false
+    }
+
+    if (!playerState.unlockedCities.includes(cityId)) {
+      return false
+    }
+
+    playerState.cityTeam = {
+      ...playerState.cityTeam,
+      teamCityId: cityId,
+      joinedDate: createAcquiredDate(now),
+      lastSwitchDate: null,
+    }
+
+    currentScene = history.pop() ?? createHomeSelectScene()
+    return true
+  }
+
   function openLevel(cityId, levelId) {
     if (!playerState.unlockedCities.includes(cityId)) {
       return false
@@ -197,8 +367,7 @@ export function createSceneStore({ contentSystem, playerState, now = () => Date.
     }
 
     history.push(currentScene)
-    currentScene = {
-      type: 'gameplay',
+    currentScene = createGameplayScene({
       cityId,
       levelId,
       session: createGameSession({
@@ -206,7 +375,7 @@ export function createSceneStore({ contentSystem, playerState, now = () => Date.
         levelId,
         contentSystem,
       }),
-    }
+    })
 
     return true
   }
@@ -246,6 +415,33 @@ export function createSceneStore({ contentSystem, playerState, now = () => Date.
     return true
   }
 
+  function completeGameplayVictory(stars = 3) {
+    if (currentScene.type !== 'gameplay') {
+      return null
+    }
+
+    if (currentScene.mode === 'mashup') {
+      const reward = awardMashupReward(contentSystem, playerState, currentScene.session.seed, now)
+      currentScene = {
+        ...currentScene,
+        rewardSummary: reward,
+      }
+      return reward
+    }
+
+    completeLevel({
+      cityId: currentScene.cityId,
+      levelId: currentScene.levelId,
+      stars,
+    })
+
+    return {
+      type: 'city',
+      cityId: currentScene.cityId,
+      levelId: currentScene.levelId,
+    }
+  }
+
   function goBack() {
     if (history.length === 0) {
       currentScene = createHomeSelectScene()
@@ -274,8 +470,11 @@ export function createSceneStore({ contentSystem, playerState, now = () => Date.
     openCity,
     openGiftZone,
     selectGiftTab,
+    openCityTeamSelect,
+    chooseCityTeam,
     openLevel,
     completeLevel,
+    completeGameplayVictory,
     restartCurrentLevel,
     goBack,
   }
diff --git a/tests/content-system.test.js b/tests/content-system.test.js
index 38871ac..7e88356 100644
--- a/tests/content-system.test.js
+++ b/tests/content-system.test.js
@@ -129,18 +129,24 @@ test('content system summarizes MVP gift albums and per-city progress', () => {
     cityId: 'beijing',
     acquiredDate: '2026-03-29T00:00:00.000Z',
   })
+  playerState.collectedCats.push('beijing')
 
   const albums = contentSystem.getGiftAlbums(playerState)
   const magnetEntries = contentSystem.getGiftAlbumEntries('magnets', playerState)
   const stampEntries = contentSystem.getGiftAlbumEntries('stamps', playerState)
+  const catEntries = contentSystem.getGiftAlbumEntries('cats', playerState)
 
-  assert.deepEqual(albums.map((album) => album.id), ['magnets', 'stamps'])
-  assert.deepEqual(albums.map((album) => album.collectedCount), [1, 1])
-  assert.deepEqual(albums.map((album) => album.totalCount), [36, 6])
+  assert.deepEqual(albums.map((album) => album.id), ['magnets', 'stamps', 'cats'])
+  assert.deepEqual(albums.map((album) => album.collectedCount), [1, 1, 1])
+  assert.deepEqual(albums.map((album) => album.totalCount), [36, 6, 6])
   assert.equal(magnetEntries[0].cityId, 'beijing')
   assert.equal(magnetEntries[0].collectedCount, 1)
   assert.equal(magnetEntries[0].totalCount, 6)
   assert.equal(stampEntries[0].cityId, 'beijing')
   assert.equal(stampEntries[0].isCollected, true)
   assert.equal(stampEntries[1].isCollected, false)
+  assert.equal(catEntries[0].cityId, 'beijing')
+  assert.equal(catEntries[0].catName, '京京')
+  assert.equal(catEntries[0].isCollected, true)
+  assert.equal(catEntries[1].isCollected, false)
 })
diff --git a/tests/difficulty-generator.test.js b/tests/difficulty-generator.test.js
index 9451cde..05677af 100644
--- a/tests/difficulty-generator.test.js
+++ b/tests/difficulty-generator.test.js
@@ -6,6 +6,7 @@ import {
   classifyDeadlock,
   evaluateBoard,
   generateBoard,
+  generateMashupBoard,
 } from '../js/gameplay/difficulty/index.js'
 
 test('generateBoard is deterministic for the same city, level, and seed', () => {
@@ -72,3 +73,23 @@ test('classifyDeadlock identifies a hard deadlock when slot is full and no match
 
   assert.equal(result.type, 'hard')
 })
+
+test('generateMashupBoard is deterministic and mixes unlocked city content', () => {
+  const contentSystem = createContentSystem()
+
+  const first = generateMashupBoard({
+    cityIds: ['beijing', 'tokyo'],
+    seed: 33001,
+    contentSystem,
+  })
+  const second = generateMashupBoard({
+    cityIds: ['beijing', 'tokyo'],
+    seed: 33001,
+    contentSystem,
+  })
+
+  assert.deepEqual(first.pieces, second.pieces)
+  assert.deepEqual(first.overlapGraph, second.overlapGraph)
+  assert.deepEqual(first.sourceCityIds, ['beijing', 'tokyo'])
+  assert.ok(new Set(first.elementDefinitions.map((entry) => entry.sourceCityId)).size >= 2)
+})
diff --git a/tests/scene-store.test.js b/tests/scene-store.test.js
index 62342be..555e1ef 100644
--- a/tests/scene-store.test.js
+++ b/tests/scene-store.test.js
@@ -118,7 +118,125 @@ test('scene store opens the gift zone and switches between MVP tabs', () => {
   assert.equal(switched, true)
   assert.equal(sceneStore.getScene().selectedTab, 'stamps')
 
+  const switchedToCats = sceneStore.selectGiftTab('cats')
+
+  assert.equal(switchedToCats, true)
+  assert.equal(sceneStore.getScene().selectedTab, 'cats')
+
   sceneStore.goBack()
 
   assert.equal(sceneStore.getScene().type, 'home-select')
 })
+
+test('scene store opens city team selection and locks the first chosen team', () => {
+  const contentSystem = createContentSystem()
+  const playerState = createDefaultPlayerState()
+  const sceneStore = createSceneStore({
+    contentSystem,
+    playerState,
+    now: () => new Date('2026-03-29T08:00:00.000Z').getTime(),
+  })
+
+  const opened = sceneStore.openCityTeamSelect()
+
+  assert.equal(opened, true)
+  assert.equal(sceneStore.getScene().type, 'city-team-select')
+  assert.deepEqual(sceneStore.getScene().options.map((entry) => entry.cityId), ['beijing'])
+
+  const selected = sceneStore.chooseCityTeam('beijing')
+
+  assert.equal(selected, true)
+  assert.deepEqual(playerState.cityTeam, {
+    teamCityId: 'beijing',
+    joinedDate: '2026-03-29T08:00:00.000Z',
+    lastSwitchDate: null,
+  })
+  assert.equal(sceneStore.getScene().type, 'home-select')
+
+  sceneStore.openCityTeamSelect()
+  const reselected = sceneStore.chooseCityTeam('beijing')
+
+  assert.equal(reselected, false)
+  assert.equal(playerState.cityTeam.teamCityId, 'beijing')
+})
+
+test('scene store opens mashup gameplay after two completed cities', () => {
+  const contentSystem = createContentSystem()
+  const playerState = createDefaultPlayerState()
+  const sceneStore = createSceneStore({
+    contentSystem,
+    playerState,
+    now: () => 33001,
+  })
+
+  playerState.unlockedCities.push('tokyo')
+  playerState.levelProgress.beijing = {
+    1: { completed: true, stars: 3 },
+    2: { completed: true, stars: 3 },
+    3: { completed: true, stars: 3 },
+    4: { completed: true, stars: 3 },
+    5: { completed: true, stars: 3 },
+    6: { completed: true, stars: 3 },
+  }
+  playerState.levelProgress.tokyo = {
+    1: { completed: true, stars: 3 },
+    2: { completed: true, stars: 3 },
+    3: { completed: true, stars: 3 },
+    4: { completed: true, stars: 3 },
+    5: { completed: true, stars: 3 },
+    6: { completed: true, stars: 3 },
+  }
+
+  const opened = sceneStore.openHomeTile('mashup')
+
+  assert.deepEqual(opened, { opened: true })
+  assert.equal(sceneStore.getScene().type, 'gameplay')
+  assert.equal(sceneStore.getScene().mode, 'mashup')
+  assert.deepEqual(sceneStore.getScene().sourceCityIds, ['beijing', 'tokyo'])
+})
+
+test('scene store awards a deterministic local mashup reward', () => {
+  const contentSystem = createContentSystem()
+  const playerState = createDefaultPlayerState()
+  const sceneStore = createSceneStore({
+    contentSystem,
+    playerState,
+    now: () => 33001,
+  })
+
+  playerState.unlockedCities.push('tokyo')
+  playerState.levelProgress.beijing = {
+    1: { completed: true, stars: 3 },
+    2: { completed: true, stars: 3 },
+    3: { completed: true, stars: 3 },
+    4: { completed: true, stars: 3 },
+    5: { completed: true, stars: 3 },
+    6: { completed: true, stars: 3 },
+  }
+  playerState.levelProgress.tokyo = {
+    1: { completed: true, stars: 3 },
+    2: { completed: true, stars: 3 },
+    3: { completed: true, stars: 3 },
+    4: { completed: true, stars: 3 },
+    5: { completed: true, stars: 3 },
+    6: { completed: true, stars: 3 },
+  }
+
+  sceneStore.openHomeTile('mashup')
+  const reward = sceneStore.completeGameplayVictory()
+
+  assert.deepEqual(reward, {
+    type: 'magnet',
+    magnetId: 'magnet_beijing_2',
+    cityId: 'beijing',
+    levelId: 2,
+  })
+  assert.deepEqual(playerState.collectedMagnets, [
+    {
+      magnetId: 'magnet_beijing_2',
+      cityId: 'beijing',
+      levelId: 2,
+      acquiredDate: '1970-01-01T00:00:33.001Z',
+    },
+  ])
+})