Immediately Give Up, yes, it's by me, and I discorage everybody from trying.
ccexplore can fan ballooners with inhuman precision and has eternal patience. He found the min-skill solution to Lemmings 2 Space 5, The Stainless Steel Lemm, where you had to balloon and fan, rope in-between the fanning, and then immediately go back to fanning and blowing the ballooner down further.
I wanted to research the limits of ccx's godly skill, and built Immediately Give Up. IIRC, ccx solved it, and nobody else.
By now, Immediately Give Up has brought cultural damage, not merely research knowledge: Kieran found it and seriously attempted it. Others might also try. Therefore I warn:
Don't play it. The sense of this is: Don't consider yourself a bad player if you don't solve it. Hint for playing because some people heed no warnings: While fanning, pause with the P key, then you keep the option to unpause with the spacebar to have the fan immediately at max speed.
If you build similar levels for some reason, at least don't let them run wild without warnings, like you would with normal packs. These levels will propagate into normal level culture. People will find your level and seriously attempt it, but it only brings rage and sorrow. Also you won't look good as a designer. Hint: Put the obvious first skill in the first slot, so the engine selects it automatically on every of the tedious restarts.
-- Simon