Finally got around to doing Crazy 7 "And Now, The End Is Near..."
This was by far the most interesting level for this challenge from
ONML; it seemed impossible at first due to the short time limit and 100% save requirement. Facing all lemmings towards the exit is the most difficult thing about this one, and it's definitely worth giving it a go before you check out the replay!
I've attached a copy of the level edited for B & B so you can try it out for yourself...