diff --git a/package.json b/package.json
index aab5da5..d13cc1f 100644
--- a/package.json
+++ b/package.json
@@ -11,8 +11,8 @@
   },
   "dependencies": {
     "vue": "^3.4.21",
-    "vue-router": "^4.3.0",
-    "vue-i18n": "^9.13.1"
+    "vue-i18n": "^9.13.1",
+    "vue-router": "^4.3.0"
   },
   "devDependencies": {
     "@vitejs/plugin-vue": "^5.0.4",
diff --git a/src/components/LanguageSwitcher.vue b/src/components/LanguageSwitcher.vue
index 0eb83c2..5177c9d 100644
--- a/src/components/LanguageSwitcher.vue
+++ b/src/components/LanguageSwitcher.vue
@@ -2,6 +2,7 @@
 import { useI18nLazy } from '../composables/useI18nLazy.js'
 
 const { current, switching, switchLocale } = useI18nLazy()
+// current 直接派生自全局 locale，无需 useI18n
 
 const locales = [
   { code: 'zh-CN', label: '中' },
diff --git a/src/composables/useI18nLazy.js b/src/composables/useI18nLazy.js
index 45396a8..581ed2f 100644
--- a/src/composables/useI18nLazy.js
+++ b/src/composables/useI18nLazy.js
@@ -1,17 +1,19 @@
-import { ref } from 'vue'
-import { loadLocaleAsync } from '../i18n/index.js'
+import { ref, computed } from 'vue'
+import i18n, { loadLocaleAsync } from '../i18n/index.js'
 
-const current = ref('zh-CN')
 const switching = ref(false)
 
 // 语言懒加载切换逻辑
+// current 派生自全局 i18n composer 的 locale（composition 模式下在 i18n.global），
+// 与各组件内 useI18n({ useScope: 'global' }) 读到的是同一个 ref。
 export function useI18nLazy() {
+  const current = computed(() => i18n.global.locale.value)
+
   async function switchLocale(locale) {
     if (switching.value || current.value === locale) return
     switching.value = true
     try {
       await loadLocaleAsync(locale)
-      current.value = locale
     } finally {
       switching.value = false
     }
diff --git a/src/i18n/index.js b/src/i18n/index.js
index 7d72872..0b22a46 100644
--- a/src/i18n/index.js
+++ b/src/i18n/index.js
@@ -22,9 +22,10 @@ const loadedLocales = new Set(['zh-CN'])
  * 之后切换仅在已加载集合内完成（无网络请求）。
  */
 export async function loadLocaleAsync(locale) {
-  if (i18n.locale.value === locale) return
+  // composition 模式下响应式 locale 在 i18n.global 上
+  if (i18n.global.locale.value === locale) return
   if (loadedLocales.has(locale)) {
-    i18n.locale.value = locale
+    i18n.global.locale.value = locale
     document.documentElement.setAttribute('lang', locale)
     return
   }
@@ -35,14 +36,14 @@ export async function loadLocaleAsync(locale) {
     messages = (await import('./locales/en.js')).default
   } else {
     // 未知语言回退到中文
-    i18n.locale.value = 'zh-CN'
+    i18n.global.locale.value = 'zh-CN'
     document.documentElement.setAttribute('lang', 'zh-CN')
     return
   }
 
-  i18n.mergeLocaleMessage(locale, messages)
+  i18n.global.mergeLocaleMessage(locale, messages)
   loadedLocales.add(locale)
-  i18n.locale.value = locale
+  i18n.global.locale.value = locale
   document.documentElement.setAttribute('lang', locale)
 }
 
diff --git a/src/modules/mobile-game/MobileGame.vue b/src/modules/mobile-game/MobileGame.vue
index 565aa50..276920b 100644
--- a/src/modules/mobile-game/MobileGame.vue
+++ b/src/modules/mobile-game/MobileGame.vue
@@ -6,7 +6,7 @@ import VersionTimeline from './components/VersionTimeline.vue'
 import TeamCard from './components/TeamCard.vue'
 import Leaderboard from './components/Leaderboard.vue'
 
-const { locale } = useI18n()
+const { locale } = useI18n({ useScope: 'global' })
 const L = (zh, en) => (locale.value === 'zh-CN' ? zh : en)
 // 站点根绝对路径，用绑定避免被 Vite 当作构建期静态资源解析
 const videoPoster = '/448/2.jpg'
@@ -28,14 +28,14 @@ const videoSrc = '/448/ml/449ml.mp4'
             </h2>
             <p>
               {{ L(
-                '项目跨越 448 与 449 两门课程。448 用 Unity 开发游戏本体，产出可浏览器试玩的 WebGL 构建与可安装的 Android APK；449 搭建展示网站与基于 PHP+MySQL 的玩家分数排行榜。主要贡献者 Zikai Wang（zikai-ui / main / Roll-a-Ball 系列）与 Hongxiang He（2D DobyAdventure）。',
-                'The project spans courses 448 and 449. 448 built the game with Unity, producing browser-playable WebGL builds and installable Android APKs; 449 built the showcase site and a PHP+MySQL player leaderboard. Main contributors: Zikai Wang (zikai-ui / main / Roll-a-Ball series) and Hongxiang He (2D DobyAdventure).'
+                '项目跨越 448 与 449 两门课程。448 用 Unity 开发游戏本体，产出可浏览器试玩的 WebGL 构建与可安装的 Android APK；449 搭建展示网站与基于 PHP+MySQL 的玩家分数排行榜。游戏经历多条并行演进线，从 2D 角色控制器与平台跳跃，最终转向手机陀螺仪操控的 3D 滚球，并尝试用 ML-Agents 做强化学习实验。',
+                'The project spans courses 448 and 449. 448 built the game with Unity, producing browser-playable WebGL builds and installable Android APKs; 449 built the showcase site and a PHP+MySQL player leaderboard. The game evolved along several parallel lines, from 2D character controllers and platformers, ultimately shifting to a gyroscope-controlled 3D rolling ball, with ML-Agents reinforcement-learning experiments.'
               ) }}
             </p>
             <p>
               {{ L(
-                '玩法经过多版本迭代：早期是键盘控制生命/能量的角色控制器，最终版改为手机陀螺仪倾斜操控的 3D 滚球，含雪花砖掉落、黄色砖弹跳等机制。还用 Unity ML-Agents 做了强化学习实验。',
-                'Gameplay iterated across versions: early builds were keyboard-controlled character controllers with health/power stats; the final version became a gyroscope-tilt 3D rolling-ball game with falling snowflake bricks and bouncing yellow bricks. ML-Agents reinforcement-learning experiments were also conducted.'
+                '玩法经过多版本迭代：早期是键盘控制生命/能量的 2D 角色控制器，最终版改为手机陀螺仪倾斜操控的 3D 滚球，含雪花砖掉落、黄色砖弹跳等机制。',
+                'Gameplay iterated across versions: early builds were keyboard-controlled 2D character controllers with health/power stats; the final version became a gyroscope-tilt 3D rolling-ball game with falling snowflake bricks and bouncing yellow bricks.'
               ) }}
             </p>
           </div>
diff --git a/src/modules/mobile-game/components/HeroSection.vue b/src/modules/mobile-game/components/HeroSection.vue
index 7e9ff63..53516f1 100644
--- a/src/modules/mobile-game/components/HeroSection.vue
+++ b/src/modules/mobile-game/components/HeroSection.vue
@@ -2,7 +2,7 @@
 import Tag from '../../../components/ui/Tag.vue'
 import { useI18n } from 'vue-i18n'
 
-const { locale } = useI18n()
+const { locale } = useI18n({ useScope: 'global' })
 
 const meta = {
   course: { zh: '迈阿密大学 · 毕设 448 / 449', en: 'Miami University · Capstone 448 / 449' },
diff --git a/src/modules/mobile-game/components/Leaderboard.vue b/src/modules/mobile-game/components/Leaderboard.vue
index ba2f6f8..188ad55 100644
--- a/src/modules/mobile-game/components/Leaderboard.vue
+++ b/src/modules/mobile-game/components/Leaderboard.vue
@@ -2,7 +2,7 @@
 import { ref, onMounted } from 'vue'
 import { useI18n } from 'vue-i18n'
 
-const { locale, t } = useI18n()
+const { locale, t } = useI18n({ useScope: 'global' })
 
 const rows = ref([])
 const state = ref('loading') // loading | ok | error
diff --git a/src/modules/mobile-game/components/ScreenshotCarousel.vue b/src/modules/mobile-game/components/ScreenshotCarousel.vue
index fcc693b..32df863 100644
--- a/src/modules/mobile-game/components/ScreenshotCarousel.vue
+++ b/src/modules/mobile-game/components/ScreenshotCarousel.vue
@@ -3,7 +3,7 @@ import { ref, onMounted, onUnmounted } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { screenshots } from '../data/versions.js'
 
-const { locale } = useI18n()
+const { locale } = useI18n({ useScope: 'global' })
 const current = ref(0)
 let timer = null
 
diff --git a/src/modules/mobile-game/components/TeamCard.vue b/src/modules/mobile-game/components/TeamCard.vue
index f4a5d5e..867a090 100644
--- a/src/modules/mobile-game/components/TeamCard.vue
+++ b/src/modules/mobile-game/components/TeamCard.vue
@@ -2,7 +2,7 @@
 import { useI18n } from 'vue-i18n'
 import { team } from '../data/team.js'
 
-const { locale } = useI18n()
+const { locale } = useI18n({ useScope: 'global' })
 const L = (obj) => (locale.value === 'zh-CN' ? obj.zh : obj.en)
 </script>
 
diff --git a/src/modules/mobile-game/components/VersionTimeline.vue b/src/modules/mobile-game/components/VersionTimeline.vue
index ee7d05e..2aa6a35 100644
--- a/src/modules/mobile-game/components/VersionTimeline.vue
+++ b/src/modules/mobile-game/components/VersionTimeline.vue
@@ -1,49 +1,90 @@
 <script setup>
+import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
-import { versions } from '../data/versions.js'
+import { versions, tracks } from '../data/versions.js'
 
-const { locale } = useI18n()
+const { locale } = useI18n({ useScope: 'global' })
 const L = (obj) => (locale.value === 'zh-CN' ? obj.zh : obj.en)
+
+// 按演进线分组；同一线内按 order 排序；线之间按各自最早 order 排序
+const grouped = computed(() => {
+  return tracks
+    .map((t) => {
+      const items = versions
+        .filter((v) => v.track === t.id)
+        .sort((a, b) => a.order - b.order)
+      return { track: t, items }
+    })
+    .filter((g) => g.items.length > 0)
+    .sort((a, b) => Math.min(...a.items.map((i) => i.order)) - Math.min(...b.items.map((i) => i.order)))
+})
+
+// 标记 3D 转折：3D 线之前的最后一条 2D 线结尾，提示形态转变
+const is3D = (track) => track.form === '3D'
 </script>
 
 <template>
   <div class="timeline">
     <div
-      v-for="(v, i) in versions"
-      :key="v.id"
-      class="timeline__item"
+      v-for="(g, gi) in grouped"
+      :key="g.track.id"
+      class="timeline__track"
+      :class="{ 'timeline__track--3d': is3D(g.track) }"
     >
-      <div class="timeline__marker">
-        <span class="timeline__dot"></span>
-        <span v-if="i < versions.length - 1" class="timeline__line"></span>
+      <!-- 线标题 -->
+      <div class="timeline__track-head">
+        <span class="timeline__form" :class="{ 'is-3d': is3D(g.track) }">{{ g.track.form }}</span>
+        <span class="timeline__track-name">{{ L(g.track.name) }}</span>
+      </div>
+      <p class="timeline__track-desc">{{ L(g.track.desc) }}</p>
+
+      <!-- 该线下的版本 -->
+      <div class="timeline__items">
+        <div
+          v-for="(v, i) in g.items"
+          :key="v.id"
+          class="timeline__item"
+        >
+          <div class="timeline__marker">
+            <span class="timeline__dot"></span>
+            <span v-if="i < g.items.length - 1" class="timeline__line"></span>
+          </div>
+          <div class="timeline__body">
+            <div class="timeline__head">
+              <span class="timeline__version">v{{ v.version }}</span>
+              <span class="timeline__product">{{ v.product }}</span>
+            </div>
+            <div class="timeline__row">
+              <span class="timeline__label">{{ locale === 'zh-CN' ? '操作' : 'Controls' }}</span>
+              <span>{{ L(v.control) }}</span>
+            </div>
+            <div class="timeline__row">
+              <span class="timeline__label">{{ locale === 'zh-CN' ? '说明' : 'Note' }}</span>
+              <span>{{ L(v.note) }}</span>
+            </div>
+            <div class="timeline__row">
+              <span class="timeline__label">Unity</span>
+              <span class="timeline__mono">{{ v.unity }}</span>
+            </div>
+            <div class="timeline__links">
+              <a v-if="v.webgl" :href="v.webgl" target="_blank" rel="noopener">
+                {{ locale === 'zh-CN' ? 'WebGL 试玩' : 'Play WebGL' }} ↗
+              </a>
+              <a v-if="v.apk" :href="v.apk" target="_blank" rel="noopener">
+                {{ locale === 'zh-CN' ? '下载 APK' : 'Download APK' }} ↗
+              </a>
+            </div>
+          </div>
+        </div>
       </div>
 
-      <div class="timeline__body">
-        <div class="timeline__head">
-          <span class="timeline__series">{{ v.series }}</span>
-          <span class="timeline__version">v{{ v.version }}</span>
-        </div>
-        <div class="timeline__product">{{ v.product }}</div>
-        <div class="timeline__row">
-          <span class="timeline__label">{{ locale === 'zh-CN' ? '操作' : 'Controls' }}</span>
-          <span>{{ L(v.control) }}</span>
-        </div>
-        <div class="timeline__row">
-          <span class="timeline__label">{{ locale === 'zh-CN' ? '说明' : 'Note' }}</span>
-          <span>{{ L(v.note) }}</span>
-        </div>
-        <div class="timeline__row">
-          <span class="timeline__label">Unity</span>
-          <span class="timeline__mono">{{ v.unity }}</span>
-        </div>
-        <div class="timeline__links">
-          <a v-if="v.webgl" :href="v.webgl" target="_blank" rel="noopener">
-            {{ locale === 'zh-CN' ? 'WebGL 试玩' : 'Play WebGL' }} ↗
-          </a>
-          <a v-if="v.apk" :href="v.apk" target="_blank" rel="noopener">
-            {{ locale === 'zh-CN' ? '下载 APK' : 'Download APK' }} ↗
-          </a>
-        </div>
+      <!-- 2D -> 3D 转折标记：仅出现在第一条 3D 线之前 -->
+      <div v-if="is3D(g.track) && gi > 0" class="timeline__pivot">
+        <span class="timeline__pivot-line"></span>
+        <span class="timeline__pivot-text">
+          {{ locale === 'zh-CN' ? '形态转变：2D → 3D 滚球' : 'Form shift: 2D → 3D rolling ball' }}
+        </span>
+        <span class="timeline__pivot-line"></span>
       </div>
     </div>
   </div>
@@ -51,42 +92,87 @@ const L = (obj) => (locale.value === 'zh-CN' ? obj.zh : obj.en)
 
 <style scoped>
 .timeline {
-  position: relative;
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-xl);
+}
+.timeline__track--3d {
+  padding-top: var(--space-sm);
+}
+
+.timeline__track-head {
+  display: flex;
+  align-items: center;
+  gap: var(--space-sm);
+  margin-bottom: var(--space-xs);
+}
+.timeline__form {
+  display: inline-flex;
+  align-items: center;
+  padding: 2px 10px;
+  font-size: 0.74rem;
+  font-weight: 600;
+  border-radius: 999px;
+  background: var(--surface-2);
+  color: var(--text-secondary);
+  letter-spacing: 0.04em;
+}
+.timeline__form.is-3d {
+  background: var(--accent-weak);
+  color: var(--accent);
+}
+.timeline__track-name {
+  font-weight: 600;
+  font-size: 1.05rem;
+  color: var(--text-primary);
+}
+.timeline__track-desc {
+  font-size: 0.9rem;
+  color: var(--text-secondary);
+  margin: 0 0 var(--space-md);
+  max-width: 640px;
+}
+
+.timeline__items {
+  padding-left: 4px;
 }
 .timeline__item {
   display: flex;
   gap: var(--space-md);
-  padding-bottom: var(--space-lg);
+  padding-bottom: var(--space-md);
 }
 .timeline__marker {
   position: relative;
-  flex: 0 0 16px;
+  flex: 0 0 14px;
   display: flex;
   flex-direction: column;
   align-items: center;
-  padding-top: 4px;
+  padding-top: 6px;
 }
 .timeline__dot {
-  width: 12px;
-  height: 12px;
+  width: 10px;
+  height: 10px;
   border-radius: 50%;
   background: var(--bg);
   border: 2px solid var(--accent);
-  flex: 0 0 12px;
+  flex: 0 0 10px;
+}
+.timeline__track--3d .timeline__dot {
+  background: var(--accent);
 }
 .timeline__line {
   flex: 1;
   width: 2px;
   background: var(--border);
   margin-top: 4px;
-  min-height: 24px;
+  min-height: 20px;
 }
 .timeline__body {
   flex: 1;
-  padding: var(--space-md) var(--space-lg);
+  padding: var(--space-sm) var(--space-md);
   background: var(--bg);
   border: 1px solid var(--border);
-  border-radius: var(--radius);
+  border-radius: var(--radius-sm);
   box-shadow: var(--shadow-sm);
   transition: box-shadow var(--transition);
 }
@@ -97,37 +183,32 @@ const L = (obj) => (locale.value === 'zh-CN' ? obj.zh : obj.en)
   display: flex;
   align-items: baseline;
   gap: var(--space-sm);
-  margin-bottom: 2px;
-}
-.timeline__series {
-  font-weight: 600;
-  color: var(--text-primary);
-  font-size: 1.02rem;
+  margin-bottom: var(--space-xs);
 }
 .timeline__version {
   font-family: var(--font-mono);
-  font-size: 0.85rem;
+  font-size: 0.82rem;
   color: var(--accent);
   background: var(--accent-weak);
   padding: 1px 8px;
   border-radius: 6px;
+  font-weight: 600;
 }
 .timeline__product {
-  font-size: 0.85rem;
+  font-size: 0.82rem;
   color: var(--text-tertiary);
-  margin-bottom: var(--space-sm);
 }
 .timeline__row {
   display: flex;
   gap: var(--space-sm);
-  font-size: 0.9rem;
+  font-size: 0.88rem;
   color: var(--text-secondary);
-  padding: 2px 0;
+  padding: 1px 0;
 }
 .timeline__label {
-  flex: 0 0 48px;
+  flex: 0 0 52px;
   color: var(--text-tertiary);
-  font-size: 0.82rem;
+  font-size: 0.8rem;
 }
 .timeline__mono {
   font-family: var(--font-mono);
@@ -135,7 +216,27 @@ const L = (obj) => (locale.value === 'zh-CN' ? obj.zh : obj.en)
 .timeline__links {
   display: flex;
   gap: var(--space-md);
-  margin-top: var(--space-sm);
-  font-size: 0.88rem;
+  margin-top: var(--space-xs);
+  font-size: 0.85rem;
+}
+
+/* 2D -> 3D 转折标记 */
+.timeline__pivot {
+  display: flex;
+  align-items: center;
+  gap: var(--space-md);
+  margin: var(--space-md) 0 0;
+}
+.timeline__pivot-line {
+  flex: 1;
+  height: 1px;
+  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
+}
+.timeline__pivot-text {
+  font-size: 0.8rem;
+  font-weight: 600;
+  color: var(--accent);
+  white-space: nowrap;
+  letter-spacing: 0.02em;
 }
 </style>
diff --git a/src/modules/mobile-game/data/versions.js b/src/modules/mobile-game/data/versions.js
index 26bee4b..792686b 100644
--- a/src/modules/mobile-game/data/versions.js
+++ b/src/modules/mobile-game/data/versions.js
@@ -1,92 +1,155 @@
 // 448 各版本数据（来自对构建产物与 index.html 的分析）
+//
+// 项目是多条线并行演进的，且经历了「2D -> 3D 滚球」的形态转变：
+//   - zikai-ui 线（0.0.0 -> 0.0.3）：2D 角色控制器，键盘控制生命/能量，最终改 WASD
+//   - main 线（0.0.0 -> 0.0.1）：2D 角色控制器，升级 Unity，加屏幕按键
+//   - doby 线（0.0.0）：2D 平台跳跃（Hongxiang He）
+//   - roll-a-ball 线（0.0.2）：3D 滚球，陀螺仪操控 —— 项目从 2D 转向 3D 的最终形态
+//
+// track 字段标识所属演进线；form 标识 2D/3D；order 用于时间线排序（按发布先后）。
+
+export const tracks = [
+  {
+    id: 'zikai-ui',
+    name: { zh: 'zikai-ui 角色控制器', en: 'zikai-ui Character Controller' },
+    form: '2D',
+    desc: {
+      zh: '迭代次数最多的线。2D 角色带生命/能量属性，操作方式从鼠标、QWER/ASDF 键盘最终改为 WASD。',
+      en: 'The most iterated line. A 2D character with health/power stats; controls evolved from mouse, QWER/ASDF keys, finally to WASD.'
+    }
+  },
+  {
+    id: 'main',
+    name: { zh: 'main 角色控制器', en: 'main Character Controller' },
+    form: '2D',
+    desc: {
+      zh: '2D 角色控制器，从 Unity 2020 升级到 2021，新增屏幕按键与跳跃。',
+      en: '2D character controller; upgraded Unity 2020 -> 2021, added on-screen buttons and jump.'
+    }
+  },
+  {
+    id: 'doby',
+    name: { zh: 'DobyAdventure', en: 'DobyAdventure' },
+    form: '2D',
+    desc: {
+      zh: '2D 横版平台跳跃，吃金币、计分、血量、触屏摇杆。',
+      en: '2D side-scrolling platformer: collect coins, score, health, touch joystick.'
+    }
+  },
+  {
+    id: 'roll-a-ball',
+    name: { zh: '3D 滚球（最终形态）', en: '3D Rolling Ball (Final Form)' },
+    form: '3D',
+    desc: {
+      zh: '项目从 2D 转向 3D 的最终形态。手机陀螺仪倾斜操控滚球，含雪花砖掉落、黄色砖弹跳等机制。',
+      en: 'The final form as the project shifted from 2D to 3D. Tilt the phone to roll the ball; snowflake bricks fall, yellow bricks bounce.'
+    }
+  }
+]
+
 export const versions = [
+  // zikai-ui 线
   {
     id: 'zikai-0.0.0',
-    series: 'zikai-ui',
+    track: 'zikai-ui',
     version: '0.0.0',
-    unity: '—',
+    unity: '-',
     product: 'My project / 1.0.2',
     webgl: '/448/zikai-0.0.0/',
     apk: null,
     control: { zh: '鼠标左键操作、右键追踪', en: 'Left mouse: operate, Right mouse: track' },
-    note: { zh: '早期鼠标控制原型', en: 'Early mouse-controlled prototype' }
+    note: { zh: '早期鼠标控制原型', en: 'Early mouse-controlled prototype' },
+    order: 1
   },
   {
     id: 'zikai-0.0.1',
-    series: 'zikai-ui',
+    track: 'zikai-ui',
     version: '0.0.1',
     unity: '2020.3.30f1',
     product: 'zikai-ui / 1.0.2',
     webgl: '/448/zikai-0.0.1/',
     apk: '/448/zikai-0.0.1/zikai.apk',
     control: { zh: '生命 Q/W/E/R、能量 A/S/D/F', en: 'Health Q/W/E/R, Power A/S/D/F' },
-    note: { zh: '引入生命/能量属性系统', en: 'Introduced health/power stat system' }
+    note: { zh: '引入生命/能量属性系统', en: 'Introduced health/power stat system' },
+    order: 2
   },
   {
     id: 'zikai-0.0.2',
-    series: 'zikai-ui',
+    track: 'zikai-ui',
     version: '0.0.2',
     unity: '2020.3.30f1',
     product: 'zikai-ui / 1.0.2',
     webgl: '/448/zikai-0.0.2/',
     apk: '/448/zikai-0.0.2/zikai.apk',
     control: { zh: '同 0.0.1', en: 'Same as 0.0.1' },
-    note: { zh: '构建产物重命名整理', en: 'Build artifact renaming' }
+    note: { zh: '构建产物重命名整理', en: 'Build artifact renaming' },
+    order: 3
   },
   {
     id: 'zikai-0.0.3',
-    series: 'zikai-ui',
+    track: 'zikai-ui',
     version: '0.0.3',
     unity: '2020.3.30f1',
     product: 'zikai-ui / 1.0.2.5',
     webgl: '/448/zikai-0.0.3/',
     apk: '/448/zikai-0.0.3/zikai.apk',
     control: { zh: 'WASD 移动、J 跳跃、K 飞行(测试)', en: 'WASD move, J jump, K fly (testing)' },
-    note: { zh: '改为 WASD 操作，最新版', en: 'Switched to WASD, latest version' }
+    note: { zh: '改为 WASD 操作，本线最新版', en: 'Switched to WASD, latest of this line' },
+    order: 4
   },
+
+  // main 线
   {
     id: 'main-0.0.0',
-    series: 'main',
+    track: 'main',
     version: '0.0.0',
     unity: '2020.3.30f1',
     product: 'zikai-main / 1.0.2.6',
     webgl: '/448/main-0.0.0/',
     apk: '/448/main-0.0.0.apk',
     control: { zh: '角色控制器', en: 'Character controller' },
-    note: { zh: '基线版本', en: 'Baseline' }
+    note: { zh: '基线版本', en: 'Baseline' },
+    order: 2
   },
   {
     id: 'main-0.0.1',
-    series: 'main',
+    track: 'main',
     version: '0.0.1',
     unity: '2021.3.12f1',
     product: 'beta / 1.0.2',
     webgl: '/448/main-0.0.1/',
     apk: '/448/main-0.0.1/zikai.apk',
     control: { zh: 'WASD 移动、K 跳跃', en: 'WASD move, K jump' },
-    note: { zh: '升级 Unity，新增屏幕按键', en: 'Upgraded Unity, added on-screen buttons' }
-  },
-  {
-    id: 'ball',
-    series: 'roll-a-ball',
-    version: '0.0.2',
-    unity: '2021.3.12f1',
-    product: '3dRoingBallt2 / 0.0.2',
-    webgl: '/448/ball/',
-    apk: '/448/203wangz199.apk',
-    control: { zh: '手机陀螺仪倾斜移动、上倾/点击跳跃', en: 'Tilt phone to move, tilt up/tap to jump' },
-    note: { zh: '最终版本，3D 滚球', en: 'Final version, 3D rolling ball' }
+    note: { zh: '升级 Unity，新增屏幕按键', en: 'Upgraded Unity, added on-screen buttons' },
+    order: 5
   },
+
+  // doby 线
   {
     id: 'hongXiang-0.0.0',
-    series: 'doby',
+    track: 'doby',
     version: '0.0.0',
     unity: '2021.2.10f1',
     product: 'DobyAdventure',
     webgl: null,
     apk: '/448/hongXiang-0.0.0/2D game.apk',
     control: { zh: 'A/D 移动、跳跃、吃金币', en: 'A/D move, jump, collect coins' },
-    note: { zh: '2D 平台跳跃（Hongxiang He）', en: '2D platformer (Hongxiang He)' }
+    note: { zh: '2D 平台跳跃', en: '2D platformer' },
+    order: 3
+  },
+
+  // roll-a-ball 线（3D，项目形态转变）
+  {
+    id: 'ball',
+    track: 'roll-a-ball',
+    version: '0.0.2',
+    unity: '2021.3.12f1',
+    product: '3dRoingBallt2 / 0.0.2',
+    webgl: '/448/ball/',
+    apk: '/448/203wangz199.apk',
+    control: { zh: '手机陀螺仪倾斜移动、上倾/点击跳跃', en: 'Tilt phone to move, tilt up/tap to jump' },
+    note: { zh: '最终版本，项目转向 3D 滚球', en: 'Final version, project shifted to 3D rolling ball' },
+    order: 6
   }
 ]