I've done level 6
Timb04 - Level 6: Who thought up THIS stupid wall?
Number of Lemmings: 30
To be saved: 30
RR: 01
Time: 3 minutes
Skills: 1 climber, 8 floaters, 2 builders, 1 basher, 4 miners
Good: A very challenging and original puzzle. The strict time limit and the huge amount of of multi-tasking means it is a very demanding level that's satisfying to solve.
Bad: The time limit does make it a little frustrating considering the amount of effort it requires, and the name could be a bit better.
Strange, after that level nocdlem asks me to insert a disk :
:
EDIT: Ack! It requires an extended graphic set. Could someone give me the link for it?