Crazy 1: Much harder than the following levels. This is a typical bulletride level: A plethora of possible approaches, but hardly any work. Unfortunately this means that some failing attempts had neater ideas than the actual solution.
Crazy 2: Rather easy level, that could be moved to Tame.
Crazy 3: Given the terrain, I had hoped for a solution that doesn't purely go along the bottom.
Crazy 4: I save 10/10 in a probably not 100% intended way.
Crazy 5: I have one backroute and one other solution that seems more intended, but has lots of spare skills.
Crazy 6: Nice and relatively easy level. Could be moved earlier.
Crazy 7: Lots of fiddling around.
Crazy 8: I really don't see a different approach, but my solution doesn't feel completely intended. Especially the miner usage feels weird.
Crazy 9: Amazing level

(now that the backroutes are removed), but could well be in the next rank.
Crazy 10: I can save 39 lemmings, so I suspect a backroute.