Sudoku
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00:12
very easy
easy
medium
tough
very tough
extreme
×
×
×
×
×
×
×
×
7
×
9
×
8
5
×
×
×
2
6
3
×
1
×
2
×
×
9
×
5
×
6
×
×
×
3
×
×
×
×
1
8
9
×
×
×
×
9
×
×
×
3
×
1
×
7
×
×
5
×
1
×
4
8
9
×
×
×
7
8
×
2
×
2
×
×
×
×
×
×
×
×
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