15x20 puzzle
Time:
3
2
2
3
2
3
2
1
3
1
2
3
1
1
3
1
1
1
1
3
1
4
3
7
2
7
1
6
1
3
3
2
6
2
6
2
5
3
4
 
 
 
 
 
 
 
 
2
15
3  3  4
2  1
 
1  3  1
5  6
2  7
1  4  4
14
5  9
15
You might wish to visit the archives, if you want more.