If you're stuck on one of the puzzles, get the solutions here

The door puzzle
* Go to the door farthest to the right and enter it. Then after the door is used,
go right. You can continue on now.

The endless puzzle
* Keep heading forward until you come to a new area. The guy before said he only tried
three times. Trying a fourth time will let you succeed.

The escape puzzle
* You'll just have to elude it as fast as you can. You go slightly faster than it, so
if you find a path without too many staglamites, you should get through. Remember you can
save before this part with the grey unknown.