20x15 puzzle
Time:
1
6
7
9
2
6
6
7
4
3
4
3
9
10
11
9
8
8
8
8
7
7
7
8
1
1 2
2 5
1 1 10 1
2 15
20
7 12
6 12
20
20
20
Opacity:
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