I have some ideas as to where I might be able to lower the number of builders on Crazy 20. A0;When I did my 15-builder solution, I didn't have time to search for more efficient routes. A0;Anyway, ccexplore, you're right that I should have seen a better route. Still, 15 builders is much better than my previous record, which is over 20.
Meanwhile, I found what is probably the most disturbing glitch solution yet:
Wild 9 -- Pass the level without using any skills at all!
It is pretty obvious what I did here. A0;It's just disturbing that the level can be so easy. A0;The worst part is, the problem can be fixed by simply placing the top entrance farther left. A0;I know for sure that this one cannot be superceded, so don't even try.
Btw, I've only confirmed this on the PC-DOS version, and it barely works. A0;Terrain or timing differences might make this impossible in other versions.