Sudoku
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00:11
very easy
easy
medium
tough
very tough
extreme
1
×
7
×
4
×
×
×
×
×
×
×
5
×
×
×
×
×
3
×
9
×
×
7
1
4
2
×
8
2
×
×
×
×
×
×
1
×
5
8
4
3
2
×
7
×
×
×
×
×
×
9
1
×
2
7
6
4
×
×
9
×
8
×
×
×
×
×
8
×
×
×
×
×
×
×
7
×
4
×
3
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