Sudoku
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00:15
very easy
easy
medium
tough
very tough
extreme
×
3
4
×
6
×
×
×
×
×
×
×
×
×
3
5
9
×
5
×
9
2
×
7
×
×
×
×
×
×
×
4
×
1
×
2
×
×
9
×
×
×
4
×
×
1
×
6
×
5
×
×
×
×
×
×
×
4
×
8
5
×
7
×
8
5
1
×
×
×
×
×
×
×
×
×
2
×
8
3
×
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