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Super Mario Bros.
Make Koopa Troopas
An ideal place to try out this weird glitch is World 6-1. Go to a small brick thingy at the bottom of the screen. Scroll this all the way to the left, then go back. When Lakitu drops a Spiny, go up and hit the brick above you. The Spiny will turn into a Koopa shell.
Since Spinys survive hits from below...
Get on the brick wall in 4-2
This glitch gets you on the brick wall in 4-2. Go to world 4-2. Jump the pits until you get to the first mushroom encased in a brick. Get it. Jump on top of the brick you got the mushroom out of and punch the 3 or 4 bricks above you. Move to the right until one-half of the space from the punched bricks is shown. Now move to the left, where the space is from the punched bricks. Try to jump up the space and you will be suspended in between the bricks to right of the space and where the screen ends to the left. This is a nifty trick to get on top of the wall a little early and to avoid the 3 goombas below.
Reset the high scores
Press A + B + L + R on the title screen to reset the high scores.