The rules
Sudoku has three rules. Each digit 1–9 can appear only once in every row, column, and 3×3 box. Click any cell to see its row, column, and box highlighted.
5
3
4
6
7
8
9
1
2
6
7
2
1
9
5
3
4
8
1
9
8
3
4
2
5
6
7
8
5
9
7
6
1
4
2
3
4
2
6
8
5
3
7
9
1
7
1
3
9
2
4
8
5
6
9
6
1
5
3
7
2
8
4
2
8
7
4
1
9
6
3
5
3
4
5
2
8
6
1
7
9
Three rules
click a cell →- 1.Each row contains 1–9 exactly once.
- 2.Each column contains 1–9 exactly once.
- 3.Each 3×3 box contains 1–9 exactly once.
Click any cell on the board.
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