but I don't know why I've got two more Hell levels than you and two fewer crystal.....
(going over to the Lemmings Level List game and count...)
Hmm...Fun 5, Fun 5 repeat, Fun 25, Fun 25 repeat, Tricky 5, Tricky 5 repeat, Taxing 20, Taxing 28, Mayhem 23
Well, I too only counted 9. For the PC version at least. Presumably other versions have slightly different levels?