Sudoku
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00:18
very easy
easy
medium
tough
very tough
extreme
×
×
9
2
×
×
×
×
5
5
×
2
×
×
×
×
×
×
×
3
6
×
×
×
4
×
9
9
×
×
×
×
8
×
2
×
×
2
8
4
×
5
3
1
×
×
1
×
7
×
×
×
×
8
7
×
1
×
×
×
3
9
×
×
×
×
×
×
×
8
×
4
6
×
×
×
×
3
1
×
×
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