419 route: Play in odd step. Lure the teeth down the path to explode the first 3 bombs, then enter the next room, moving (from the gravel next to the dirt) R D 4R (2D) 2L D R U R 3D L D 2R D R U L U L 5U, then move L D R U 5 times so that the teeth clones 6 fireballs, allowing the next room to be reached. Duck past the teeth, then remove dirt so that the bug explodes the rightmost bomb, then push the block onto the button. This clones a walker in the next room – remove dirt so that it explodes the bomb, allowing the fire boots and flippers to be collected. Go through the fire (dodging fireballs) to collect the suction boots, then go across the thief then across the top and down the left of the paramecium room to reach another group of teeth. Walk up the left side past the first set of teeth, then collect the 2 red keys immediately above then move U 2R then R as the teeth moves L, then D R 3D L D 2L 5U R U, through the red doors, across the water, then push the block into the bomb (clearing the necessary dirt squares first). Now collect all of the red keys (dodging the paramecium if necessary), then go through the red doors and dodge the walker to reach the exit.