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