The first second and fourth sections aren't that hard if you have some pipelining skill. It's the third and especially the last sections that will get you.Seems like i missed a spot. It's funny i remember having that on my original nonoptimized one.
I don't know if I'd call this a must play level, but it certainly is worth playing a few times. The tricks are good and difficult to come by. Play FMO for the block patterns, then play this for the timing. Excellent set of levels
Ah so that's the "other path" interesting I had originally dismissed the "straightforward" approach. I think I still like the path on the second one better