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There Are 256 Glitched Levels in Super Mario Bros.
Photo: Nintendo![]()
If you want to access the 256(!) extra glitch levels in Super Mario Bros. you need to go find yourself a top loading NES system and a copy of Nintendo Tennis. Put your Mario cartridge in, then take it out with the system still on. Put the Tennis cartridge in, then reset. Serve once, run around for a bit, and then take Tennis out with the system still on and put Mario back in. Reset Mario, then press both A and start at once and you’ll be on one of the 256 glitched out “secret levels."