15x15 puzzle
Time:
6
3
2
3
3
3
3
9
9
6
4
3
3
2
2
1
2
1
1
2
1
3
1
7
4
7
15
2 8
1 6 1
1 4 2 1
7 1
5 1
4 2
4
4
Opacity:
Original image
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