I think I've been stuck on this one for like a week now? I downloaded 2.7 which has improved matters a bit as the lemmings aren't getting caught by the trap as easily, but I think there's either something wrong with the level or I'm being extremely thick. (probably the latter lol) I've been watching the solutions to it online but I can't seem to replicate them - the climbers just climb up the bit where the trap is, land and then get killed, and there's no real way to get more than one lemming to turn around.
Sorry to ask, but it'd be great if someone could give me some help :D
Never mind - I'd just posted this when I managed to figure out the solution. It's a great level but very hard :)