Loss of Lemmings: One
Jump one Lemming over the small pit. The catapult will land it in the top tray. Let it reflect, then Stomp in the middle of the tray. Explode it, starting the timer just before the right hand edge of the small ledge - this will blow through the bulkhead. Jump another Lemming over to the catapult. Jump it over the hole in the tray, then let it reflect and fall down the hole. After it passes through the hole in the bulkhead, Rope back to the bulkhead to block it off. Platform across the water. Stomp to release the main horde.