QuietdokuSupport
Questions, bug reports or ideas? Email support@quietdoku.com — a real person reads every message, usually within two working days. Please include your Quietdoku account ID (shown at the bottom of the Me screen) if your question is about your account or data.
Common questions
Is Quietdoku really free?
Yes. The daily puzzles, rankings, achievements, hints and sync are free forever, with no ads. An optional Quietdoku Pro unlocks unlimited free play in the app.
Why are there no ads?
Because ads break concentration, and sudoku is about concentration. We would rather charge a small, optional fee than interrupt your puzzle.
Do I need an account?
No. You can play on the web and in the app without signing up. In the app you can optionally sign in with Apple or Google to keep your progress when you change phones.
Does every puzzle have a unique solution?
Yes. Every puzzle is checked by a solver to have exactly one solution, and is graded by the techniques a human needs — no guessing required.
Can I play offline?
The app works fully offline. Rankings and challenges sync the next time you are online.
How do I delete my account and data?
In the app, open Me → Delete account. This removes your results, rankings and cloud progress immediately. Progress on your phone stays until you delete the app.
How do I restore Quietdoku Pro on a new phone?
Open Me → Quietdoku Pro → Restore purchases, signed in to the same Apple ID or Google account you bought it with.
帮助（简体中文）
有问题或建议请发邮件到 support@quietdoku.com，涉及账号和数据时请附上「我的」页底部显示的账号 ID。删除账号：App 内「我的 → 删除账号」。恢复 Pro：App 内「我的 → Quietdoku Pro → 恢复购买」。
Quietdoku 真的免费吗？
是的。每日挑战、排行榜、成就、提示和同步永久免费，而且没有广告。可选的 Quietdoku Pro 可以在 App 里解锁无限自由练习。
为什么不放广告？
因为广告会打断专注，而数独玩的就是专注。我们宁愿收一点可选的费用，也不打扰你做题。
需要注册账号吗？
不需要。网页和 App 都不用注册就能玩。在 App 里可以选择用 Apple 或 Google 登录，换手机时保留进度。
每道题都只有唯一解吗？
是的。每道题都经过程序验证只有唯一解，并按真人解题需要的技巧分级，不需要猜。
可以离线玩吗？
App 可以完全离线使用，排行榜和挑战会在下次联网时同步。