I think the 76 path is great! Not obvious and has a few good micro optimizations in it too. Excellent level especially considering the symmetry design limitation.
(14 years ago) Instead of 2-off, I found many 20-offs haha Edit: Beaten, very nice level.
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(12-11-2022) Completed "Duke's PP1 world" inside Pathology - that's a really excellent and exciting world!
6 off... will try to cut down the steps later. Really takes time to figure out how to breakthrough. edit: found a new way, but 6 off again... edit 2015: finally beaten, truly one of the best PP1 level!
edit 11-11-2022: I guess now I can appreciate a 2-off here, but the comments section help a lot XD.