And more Crazy: 18R and 19R improved to 100%, replays attached.
Covox Lemmings:
Fun 1 - 100% LR*
Fun 2 - 100% R
Tricky 1 - 100% R* (this is incredibly hard to pull off, as far as I can tell)
Tricky 2 - no idea
Taxing 1 - might be able to 100% R but I hate timing builders like that
Taxing 2 - 100% R
Mayhem 1 - 100% R*
Mayhem 2 - R
* = I didn't try it, but it seems obvious enough
We haven't included these levels in challenge threads so far, but now I think about it, it might be a good idea to add this set to the older, "finished" challenges. I found a couple more solutions: Fun 2 left 100% and Mayhem 2 right 100%. Replays attached for these, plus Taxing 1.
I also took the liberty of playing through the bonus levels from the Lemmings Strategy Guide (these could also be added to existing challenges - you can find them
here). My results (for convenience, I numbered these 1-16 instead of labelling them Fun through Mayhem):
L: 1, 5*, 8, 10, 13*. Non-100%: 1.
R: 1, 3, 4, 5, 6, 7*, 8, 9, 10, 11, 12*, 13*, 14, 16. Non-100%: 6.
* replays attached for these levels.