20x15 puzzle
Time:
4
4
4
4
4
4
4
1
4
1
1
4 3
1
3
1
3
2
4
2
5
2
6
1
5
1
6
1
5
1
4
1
1
1
1 1 3
2
 
 
3
5
7
16  1
16  1
12  4  1
6
 
 
3  1
3
3  3  1
5  14
You might wish to visit the archives, if you want more.