In the store version, open Settings → Full Game → Restore Purchases while connected to the Internet. Use the same store account that made the purchase. If it is still locked, contact us with the app version and the store used; do not buy it again to troubleshoot. Restoring a purchase restores access, not puzzle progress, and purchases do not transfer between Apple and Google stores.

The web demo keeps progress in this browser on this device. Clearing site data removes it; another browser, private window or the app does not share it. The app also stores progress locally and does not offer account-based cloud sync. Do not clear data or reinstall as a first troubleshooting step.

The web demo has 24 puzzles and no daily challenge. The app has 100 free puzzles and the current daily challenge; the full game unlocks the remaining 500 and past daily puzzles. The app is available on the App Store and Google Play. App downloads are temporarily unavailable in mainland China due to the game publishing licence (版号) requirement; the web demo remains available. Official availability and downloads.

Check your connection and reopen the page or app. The daily challenge is an app feature. If the problem continues, report the date, the screen you reached and any error text. Keep your saved data while investigating.

在商店版本中，联网后打开「设置 → 完整版 → 恢复购买」，并确认使用原来购买时的商店账号。仍未恢复时，请提供App版本和购买渠道联系我们，不要为了排查而重复购买。恢复购买恢复的是访问权益，不是解题进度；Apple与Google商店之间的购买不互通。

网页试玩进度保存在当前设备的当前浏览器，清除站点数据会删除进度；其他浏览器、隐私窗口与App不会共享进度。App进度也保存在本地，目前不提供账号云同步。排查问题时，请不要先清除数据或重装。

网页试玩含24关，没有每日挑战。App含100个免费关卡和当天每日挑战；完整版解锁其余500关及往期每日挑战。App已在App Store和Google Play正式上线。中国大陆因游戏版号问题，暂不支持App下载；可体验网页试玩。查看官方发布状态与下载入口。

先检查网络，再重新打开页面或App。每日挑战是App功能。若仍失败，请记录日期、停留页面和错误文字并联系我们；排查期间保留现有存档。