If you jump at a wall just right, you'll "catch" the wall with your foot, and you'll be able to jump off the wall! This has many practical uses, such as in the beginning of World 6-9. Have small Mario jump off the ice blocks into the wall of ice. When Mario touches the wall, jump again and he should make it over the top. Go right and you'll find the end of the stage! Note: This glitch requires a perfect jump and good timing.