需要帮助，或者只是想说点什么？都在这里。
选择一个空格，点下方数字填入。每一行、每一列、每个 3×3 宫内，1–9 各出现一次即胜。新手可在开场选择「我是新手」，会有真棋盘上的分步教程带你上手。
简单 / 中等 / 困难 / 专家 / 世界难题，逐级提升。「世界难题」是世界公认的经典残局与分级题库，挑战极限。
解题卡住时，教练会在棋盘上高亮演示下一步的逻辑，用大白话讲你该怎么想、而不只是给答案。这是可选的付费功能：其余玩法全部免费。
像在报纸上解题：不限错误、不标红、不高亮，填满后才揭晓对错——对错全凭自己判断。可在开场选择，或在设置里开启。
用同一个 Apple ID，在解锁页点「恢复购买 / Restore」即可免费恢复。一次买断，永久有效。
非常安全——App 不收集任何个人数据，玩法、进度、记录都只存在你设备本地。唯一的例外是：只有你主动使用「AI 教练」时，才会把当前盘面（纯数字、不含任何身份信息）发出以生成讲解。详见 隐私政策。
没找到答案，或者有建议、想报告问题？写信给我，我会亲自回复。
bing2002czy@gmail.comNeed a hand, or just want to say something? It's all here.
Tap an empty cell, then tap a number below to fill it. Fill the grid so every row, every column, and every 3×3 box contains 1–9 exactly once. New to sudoku? Choose "I'm new" at the start for a step-by-step tutorial right on the board.
Easy / Medium / Hard / Expert / World's Hardest, rising in order. World's Hardest features world-renowned classic puzzles and a graded bank, for the very edge of the game.
Stuck? The coach highlights the logic of your next move right on the board and explains, in plain words, how to think it through — rather than just handing you the answer. It's an optional, paid feature; everything else is free.
Solve like it's newsprint: no mistake limit, nothing flagged, nothing highlighted. The verdict only appears once the grid is full — it's yours alone. Choose it at the start, or turn it on in Settings.
With the same Apple ID, tap "Restore" on the unlock screen to restore for free. Pay once, yours forever.
Very safe — the app collects no personal data; your play, progress, and records all stay on your device. The one exception: only when you actively use the AI Coach is the current board (just digits, with nothing that identifies you) sent out to generate the explanation. See the Privacy Policy.
Didn't find your answer, or have a suggestion or bug to report? Drop me a line — I reply personally.
bing2002czy@gmail.com