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Sudoku
Fill every row, column, and 3×3 box with the digits 1–9.
Easy
Medium
Hard
4
1
5
1
3
7
2
1
3
9
4
7
6
9
8
6
1
7
3
8
6
9
4
4
5
1
Notes OFF
Undo
1
4
2
8
3
6
4
5
5
7
6
6
7
6
8
7
9
6
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