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
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