207 route: Collect the fire boots, then get the chips and blue key. Open the door to the right, and push the blocks into the water to get the blue key. One block will remain at (23,11), bring the other remaining block out, get the first 2 chips from behind the fire, open the blue door and use the block to get the red key. Go through the red door and push the block below the tank 3U. Go back, push the blue button twice with a  pause immediately after the pink ball pushes it. Move the block right, down and up (collecting the remaining chips from the fire room) across the water in order to access the remaining block (the toggle walls will have been flipped by the lower tank which is now stuck at the bottom). Push this block across the water at the top to access the green button. Press it, step back, wait  and press it again. This will release the bottom glider, allowing the bottom area to be accessed, which contains chips and a red key. Return to the start, collecting the chip below the pink ball, through the red door, collect the remaining chips and exit.