Loss of Lemmings: Zero
Make the first Lemming a Runner, and immediately make the second an Attractor. Let the runner drop onto the steel, then Jump onto the island, and immediately Jump again to reach the alcove at right. Let it reflect, and Balloon back up to the island. Click an Archer, aiming the arrow at the corner of the hatch ledge. Click another Archer; this time aim a few pixels higher. The second arrow should tag on to the first, making the lake safe. Let the Lemming drop, and Rope up to the bottom left corner of the island, sealing off the route to the right. Build at the left end of the small pile of stones on the exit level - it conceals a dragon, whose trigger is a few pixels left of the pile.