How do you get to the negative world in Super Mario Bros?

Sketchy Stage 4-7 glitches in Super Mario Bros.

The Stage 4-5 wall glitch in Super Mario Bros.

A glitch that carried over to additional levels in Super Mario Bros.

Level deletion in Stage 7-1 of Super Mario Bros.

Using the same idea, the 4-2 Warp Glitch in Super Mario Bros.

The strange “negative world” in Super Mario Bros.

Strange level glitches have always been abundant in Super Mario Bros. (Additional NES codes can be accessed through The Warp Zone).

NES users can access the Game Genie Debug Menu through The Mushroom Kingdom’s website, where SNES users playing through the newer port of the game can find the codes here. All this accessible through a game genie! Even more amazingly, these levels stayed intact when the game was ported over the Super Nintendo Entertainment System! 3 box! In addition to that, there were also new sprites and enemies that the general public had never encountered before. The Mushroom Kingdom outlined each of these levels, including the one that was ominously placed on the back of the original Super Mario Bros. waiting for you after you left the last pipe). Some didn’t have enemies, some where strangely put together, others were unnecessarily unfair (like level 7 that had two Hammer Bros.

While developing, these programmers created testing grounds – “levels” that never saw the light of day for good reason.

Obviously developers spent a long time working each of the levels out, to create a unique experience that far surpasses any of the other games released at the time. This game, however, didn’t become that way overnight. 3 has long been hailed as one of the best games to be released for the NES, and perhaps in Nintendo history. Interested in these levels, I decided to do a little searching to find out what these levels were really about. 3 cartridge that never saw the light of day. The story on Infendo that is currently at the top of Reddit’s “Gaming Subreddit” pointed out that there were in fact hidden levels deep within the Super Mario Bros.

How do you get to the negative world in Super Mario Bros?