20x15 puzzle
Time:
1
2
3
2
3
2
2
3
2
3
2
4
1
1
4
1
1
3
1
2
3
1
2
3
1
2
3
1
1
3
1
1
3
1
1
4
1
1
4
1
1
3
1
1
3
1
1
3
1
1
2
1
3
1
3
 
 
 
 
1
1  1  15
 
4
9  7
5
1
2  2
20
20
17  2
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