When word of the original negative worlds spread, gamers began searching for more secret worlds in Mario. It wasn't long before a hacker discovered that there was a total of 256 glitchy, randomised levels hidden in Mario - filled with strange neon colours, corrupted enemies and all manner of surreal oddities that seem to have been plucked straight from the dreams that NES Mario has when he sleeps at night. How to unlock them: There is no easy solution for this one unfortunately. You could use a Game Genie and type in the codes, or a Level Editor to insert flagpoles at the end of certain levels like '-1' and 8-4, which then transport you to the 'other place'. Alternatively, if you own a top-loading Nintendo, a copy of Super Mario Bros and a copy of Tennis, then there is a bizarre glitchy way you can get teleported to Mario's strange nether realm. Figuring that one out must've been a lifetime's worth of work...