If you stomp a Koopa Troopa 1 or 2 blocks above the bottom of the screen, his shell will be floating in mid-air! Try this on a Koopa Paratroopa hovering over a pit. For a real challenge, try to land on solid ground after double-stomping the Paratroopa. When the Koopa pops back out of his shell, he'll start walking in mid-air! It's not the easiest glitch to pull off, but a good place to practice this is with the Paratroopa in World 4-3.