There's an amazing hack to play hundreds of secret 'Super Mario Bros.' levels hidden on the cartridge

Super marioNintendoA screenshot from Nintendo’s 1985 classic video game Super Mario Bros.

The original “Super Mario Bros.” is more than just the 32 or so levels you’ve played. The original “Super Mario Bros.” actually has hundreds more levels. 
Hundreds!

Those levels, however, are messed up. They’re broken, contain enemies that have no place within them (a goomba underwater?!), and look completely bananas. They’re the bastard children of Nintendo’s most revered game, hidden away in the annals of each cartridge’s ageing chips. These are levels Nintendo never intended anyone to see, and the company’s never really spoken about them as a result.

But guess what? Intrepid Nintendo enthusiasts have cracked a crazy secret process for unlocking these hidden levels.

Here’s how to do it.

There's one well-known secret world in the original 'Super Mario Bros.' -- it's called the 'Negative World.'

It's just one of many of the hidden levels contained in 'Super Mario Bros.,' and it's perhaps the most widely known. You can reach it by performing an awkward backwards jump in the game's second level, 1-2, like so:RAW Embed

It's so-named because of the '-1' seen in the 'World' area of the screen:

Nintendo

The level itself is just a standard underwater level, though it's impossible to progress beyond it. Exiting the level results in a loop.

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But that's just the beginning. There's a far more involved hack that enables anyone to access hundreds of hidden levels in the original 'Super Mario Bros.' You need three items to pull it off -- first up: an original 'Super Mario Bros.' cartridge:

Nintendo

And a copy of 'Tennis' for the original Nintendo Entertainment System:

Nintendo

And a top-loading Nintendo Entertainment System:

At any point during the first level, 1-1, pull the cartridge out of the system while the system remains powered on.

Nintendo

BEWARE: Yes, this might break your NES, and your game. Try this at your own risk.

Replace the 'Super Mario Bros.' cartridge with the 'Tennis' cartridge in your top-loading NES. Press the reset button. The menu screen should appear, like so:

Nintendo

Start a one-player game and get moving around.

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After a minute or so, pluck the 'Tennis' cartridge from your NES and replace it with 'Super Mario Bros.' Hit the reset button.

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When 'Super Mario Bros.' reloads, it will load into one of the hundreds of secret levels in the game. Just look at this:

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Even crazier? Every time you do the trick, you get a different secret level:

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And:

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If you can get your hands on a working Game Genie -- a device for hacking 'cheats' into games -- there's an even easier way to just input a code and access all these levels.

Galoob

And for more information on the hundreds of secret levels in 'Super Mario Bros.,' check out this episode of 'Pop Fiction' from GameTrailers.com!

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