Normally the game loads the data from the first warp zone when you walk to the end (scrolling the screen), but performing the wall glitch moves the character without scrolling the screen.

This gives the appearance in World 4-2 of a warp zone with only one location, as shown in the screenshot below:įor unknown reasons, the World 4-2 warp zone is the 'default' warp zone, and it's warp zone data is used if there is no other data loaded. The first nine represent the numerals 0 through 9, and the next 26 being capital letters (A-Z). This was done, because the 36 (0x24)'s tile is a tile that takes the color of the current background (for all intents and purposes, transparent). This can be verified by looking in a level editor, as shown here: Internally, the game represents the second warp zone mentioned as World 36, World 5, and World 36 again. The first warp zone takes you normally to World 2, 3, and 4, while the second one only allows the player to World 5, however, the warp zones internally must have three locations.

There are two of these that are important for the minus world glitch: the one at the end of World 1-2 (following the exit pipe) and the one at the end of World 4-2 (also following the exit pipe). In Super Mario Bros, you can access warp zones in three areas of the game.

Super mario world game genie