John's Sudoku is one of the most comprehensive Sudoku game systems. It randomly creates puzzles for six difficulty levels. You may never meet the same puzzle. But you can do the same one via user defined puzzle. Or you can define your own puzzle via Sudoku Book. You can also share the same puzzle with your friends via the importing/exporting function of this system. The followings are the summary of the function: 约翰的数独是最全面的数独游戏系统之一。 它随机地创建六个难度级别的拼图。 你可能永远也不会遇到同样的拼图。 不过您可以通过用户定义的拼图来做同样的拼图。 或者您可以从数独书来定义自己的拼图。 您还可以通过此系统的输入/输出功能与您的朋友分享相同的拼图。功能总结如下： 1. Randomly creates puzzle for six difficulty levels. 2. User can define his/her own puzzle, e.g. from Sudoku Book. 3. Check the status and highlight the error. 4. Easy to see the working cells with the most advanced highlighting function. 5. Auto-pencil the selected cell. 6. Undo/Redo function. 7. Auto-pencil (or auto-erase) all the cells with one tap. 8. Revert to the last clean state via 'Eliminate error input'. 9. Resolve the puzzle . 10. Import/export your puzzle to share with friends. 11. Reset to the original puzzle. 12. Game is auto-saved. You only need to tap Resume when you return to the app. 1. 随机产生六个难度级别的拼图。 2. 用户可以定义自己的拼图，例如从数独书。 3. 检查状态并突出显示错误。 4. 使用最先进的突出显示功能轻松查看工作单元格。 5. 自动标记所选单元格。 6. 撤消/重做功能。 7. 一键自动标记（或擦除）所有单元格。8. 可以通过 ‘消除错误输入’ 返回到上个正确状态 。 9. 拼图解题功能。 10. 通过输入/输出拼图以与朋友分享乐趣。 11. 重新设定到原始的拼图。 12. 游戏自动保存，您只需点击“恢复”即可。