怎么玩数独？
数独（Sudoku）是全球最受欢迎的益智游戏之一。1979 年由美国人 Howard Garns 发明，后经日本 Nikoli 公司于 1984 年推广，现在几乎每份报纸的益智版都有它的身影。规则只有一条：在 9×9 方格中填入 1–9，使每行、每列、每个 3×3 宫格内的数字各不重复。
操作方式
- 点击空白格子选中（高亮显示相关行列宫）。
- 点击下方数字键盘输入数字；点「清」删除已填数字。
- 也可以直接按键盘 1–9 输入，Delete/Backspace 删除。
解题技巧
- 排除法（Elimination）。对于某行已有 1,2,3,5,6,7,8,9，那剩下的空格只能填 4。这是最基础的技巧。
- 唯一候选数（Sole Candidate）。在某个 3×3 宫中，某个数字只有一个空格可以放，那就必须放在那里。
- 用铅笔标记（候选数）。先在每个空格旁边记下所有可能的数字，再逐步排除，找到确定答案。
关于这款游戏
这是昼夜工坊原创的数独网页版：每局由算法生成有且只有一个唯一解的谜题，简单难度保留约 35 个提示数字，困难难度约 25 个。用时和错误次数实时记录，最佳用时保存在本机。免费、即开即玩，手机电脑均可畅玩。
常见问题
数独的规则是什么？
每行、每列、每个3×3宫格内均填入1-9，且各不重复。
每局都有唯一解吗？
是的，我们的生成算法确保每局有且只有一个正确解。
填错了怎么办？
错误格显示为红色。再次点击并输入正确数字覆盖，或点「清」删除。
How to play Sudoku
Sudoku is one of the world's most popular puzzle games, invented by Howard Garns in 1979 and popularised by Japan's Nikoli in 1984. The rule: fill the 9×9 grid with digits 1–9 so that every row, column, and 3×3 box contains each digit exactly once.
Controls
- Click an empty cell to select it (highlights the row, column and box).
- Click the number pad or press keyboard keys 1–9 to fill. Click Erase or Backspace to clear.
Solving techniques
- Elimination. If a row has 1,2,3,5,6,7,8,9 already, the remaining cell must be 4.
- Sole candidate. If a digit can only go in one cell within a box, row or column, it must go there.
- Pencil marks. Write all possible candidates in each empty cell, then eliminate as you solve.
About this game
Original Sudoku by Day & Night Studio — algorithmically generated puzzles with a unique solution, ~35 clues (easy) or ~25 clues (hard). Timer and error count tracked live, best time saved locally. Free, instant play.
FAQ
What are the rules?
Fill every row, column and 3×3 box with digits 1–9, each digit appearing exactly once.
Does every puzzle have a unique solution?
Yes — every generated puzzle has exactly one correct solution.
What if I make a mistake?
Wrong cells show in red. Click and overwrite with the correct digit, or use Erase to clear.