20x15 puzzle
Time:
12 12 11 10 6
2
6
1
5 4 3 1 3 5 8 9 10 13 12 13 15 15
2  1  2
3  1  2
4  2  8
8  8
9  9
20
9  10
6  10
5  9
4  8
6  7
5  6
5
4
3
You might wish to visit the archives, if you want more.