Finally!
Conway06.dat-Level 5-Somebody switch on a light!
No. of lemmings: 20
Save: 50%
RR: 1
Time: 3 minutes
Skills: 1 climber, 8 floaters, 1 bomber, 2 blockers, 15 builders, 1 basher, 2 miners, 1 digger
Good: The invisible aspect is clever...
Bad: But very poorly implemented. It's simply a case of trial and error finding the solution, and it's near impossible to do without looking in EGA mode.