Decades later, the classic Super Mario Bros. games still have more secrets to be uncovered. Most console gamers of a certain age will remember the Minus World glitch, but that's not the only secret level hidden in the old games – in fact, there are a pile of additional, glitched levels in Super Mario All-Stars that have only just been discovered by a band of speedrunners and glitch hunters.
The Minus World is a glitched level you can access in the original NES version of Super Mario Bros. by essentially phasing through a wall in level 1-2 and entering the hidden warp pipe at the end of the stage before it fully scrolls in. Different versions of the game each have their own Minus Worlds, with different variants on the glitched level appearing in the Famicom Disc System and arcade Vs. versions.
