15x20 puzzle
Time:
2
1
2
3
2
3
1
3
4
1
1
4
1
1
5
1
1
5
2
5
11
6
4
3
3
6
1
1
5
6
5
7
4
10
9
9
9
7
4
1
1
7
3
3
1
2
4
1 5
2 1 3
1 4 5
5 5
2 2
1 3
Opacity:
Original image
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