Super Mario Brothers Cheats

The Minus World was a glitch in the original game. To reach the level, stand on the pipe in World 1-2 that takes you to the flagpole. Break the 2nd and 3rd blocks from the right. Then, face left and jump. Hit the back of your head on the left side of the brick next to the pipe. If you do it right, you should be pulled through the wall. Quickly jump into the left pipe to enter the Minus World, which has no exit. If you wait too long, however, you'll end up in World 4.