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