when you make your rocket go down, keep jumping until you trip! dont forget to push teh red button, or you will be trapped in the lower area until you reset! if you do get stuck, try using the portal gun to teleport up. but you might get stuck, and remember, the ship is moving fast. have fun! P.S: It works by having both u and the rocket fall down at the same time, causing the illusion of no gravity, in case u were wondering.