15x23 puzzle
Time:
15
14
14
12
6
1
4
1
2
1
2
1
2
1
4
1
4
1
6
1
7
1
11
11
1
3
3
4
4 2
5 4
6 6
15
15
6 6
5 4
4 3
4 2
4 2
15
Opacity:
Original image
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