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
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