303 route: Play in odd step. Push the second block into the water (but do not step on it). Open the yellow door and move the first block to where the second block was initially, step on the dirt, then move the first block up to the water, allowing the ball to hit the brown button. Move down to the ice and across and up to the teleporter (collecting the upper chip along the way). Collect the suction boots, then return to the other chip and go down and left towards the green button. After pressing it, push the block (concealing a blue key) right towards the bomb, open the blue door, push the block up and then left to reach the red key. Press the green button again, open the red door, push the first block into the water and move the second block two spaces above the toggle wall. Press the green button again, and collect the chip behind the three blue walls (all of them fake – the optimal route involves removing the lower 2 walls and also involves stepping through the ice corner on the way out). Now move right and collect the fire boots, then push the block 2U, collect the chip, then press the blue button (with perfect timing, the tank will reach the brown button without being hindered by the gliders). Now collect the chip by the walker, then the green key, then the 4 chips to the left in an anti-clockwise sense (no waiting will be necessary if Chip is an even number of steps away from the walker). Collect the chip behind the green door, then explode the bomb near the start using the block above the fire (which has a chip under it). Collect the last chip and exit.