20x15 puzzle
Time:
15 15 15 5
5
4
4
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
4
5
4
15 15 15
20
20
20
5  5
4  4
3  3
3  3
3  3
3  3
3  3
4  3
5  5
20
20
20
You might wish to visit the archives, if you want more.