hard 12×12 Set 2 Grid Puzzle
4
9
12
8
2
10
1
5
4
7
8
12
3
5
7
7
10
11
2
8
10
6
2
7
4
3
9
11
1
11
8
7
3
11
1
7
4
10
5
3
11
1
9
12
6
5