That was funny. The comp being closed down (Apologies about that, I shouldn't really say it).
Anyway, I've submitted 6 more levels: 2 SP and 5 MP. Why? Because of the note below.
Note: For the 2P version of "Safe in the centre" I made it challenging for single player use as well as MP. Why don't we put that idea into perspective?
Edit: The 7000th post on the lemmings forum as well.