In Dino Mines, when you perform the Swim in the Air Glitch and swim out of the boundaries. You will see a portal. Go through it and you will end up in an arena with nothing in it. To get out,you can exit the level or you will have run around the arena, because there isn't a portal for you to get out. If you find the invisible portal, you go through it and either: * Go through the wall OR * Fall and lose all your lives