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Sudoku
Fill the grid so every row, column and box has 1–9.
40/81 filled. Type digits, then press Check.
8
1
9
6
5
4
9
7
9
7
5
2
6
3
1
5
9
8
2
7
1
8
4
9
2
9
7
4
6
5
6
2
1
8
9
6
8
5
1
2
Check
Reveal one
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