hard 9×9 Set 3 Grid Puzzle
6
5
1
2
9
7
2
1
9
6
5
7
2
2
6
4
5
6
3
7
8
5
3
2
4
8
7
2
7
8
4
5
6
1
2
9
8
6
3
7
1
4
9
3
5
6