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How to unlock hundreds of secret 'Super Mario Bros.' levels hidden on the cartridge

Ben GilbertOct 2, 2016, 23:37 IST

A screenshot from Nintendo's 1985 classic video game Super Mario Bros.Nintendo

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 aging chips. These are levels Nintendo never intended anyone to see, and the company has never really spoken about them as a result.

But intrepid Nintendo enthusiasts have cracked the crazy secret process for unlocking them.

Here's how to do it.