(I did the capitalisation myself, after all, there's only capitals in Lemmings)
Fun 1 Rent-a-Lemming
Fun 2 Down and Out Lemmings
Fun 3 Who's that Lemming? (the question mark is an assumption, it falls out of my screen)
Fun 4 The Ski Jump
Fun 5 Thunder-Lemmings are go!
Fun 6 This should be a doddle!
Fun 7 Downwardly Mobile Lemmings
Fun 8 We All Fall Down
Fun 9 Been there, seen it, done it
Fun 10 Tightrope City
Tricky 1 I have a Cunning Plan
Tricky 2 Over Troubled Water
Tricky 3 All or Nothing
Tricky 4 Curse of the Pharaohs
Tricky 5 Ozone Friendly Lemmings
Tricky 6 Exodus
Tricky 7 Perseverance
Tricky 8 Compression Method
Tricky 9 We All Fall Down 2
Tricky 10 Said the Spider to the Lemming
Taxing 1 The Boiler Room
Taxing 2 Turn around your Lemmings!
Taxing 3 Double Trouble
Taxing 4 We All Fall Down 3
Taxing 5 Heaven can wait we hope
Taxing 6 The Prison
Taxing 7 Tribute to M.C. Escher
Taxing 8 Pillars of Hercules
Edit, so I don't create more unnecessary posts: Haha, I was struggling with Perseverance, but then I noticed you've got 20 Floaters for some reason, while the amount of Lemmings in this port is also 20. :D