20x15 puzzle
Time:
1 1 1
3
1
2
1
1
1
4
1
2
5
1
1
1 2
6
1
6
1
7
1
7
2
8
2
8
1
8
1
7
2
6
2 5
 
3
7
6  1
5  1
1
2
6  5
7
2  9
3  9
3  9
1  2  9
1  1  9
2  1  5
You might wish to visit the archives, if you want more.