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