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