
Hack Your Game To Unlock The Secret Levels Of Super Mario Bros (15 pics + video)
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: