Japan's Version of the Minus World Is Totally Different
Photo:
Nintendo
The Minus World is a giant glitch in Super Mario Bros. that allows you to pass through a wall at the end of World 1-2 and get to the first Warp Zone via a method the game didn’t intend. Enter the far left pipe and you’ll end up in World -1, an infinitely looping underwater stage. In the Japanese Famicom Disk System version, the Minus World remains, but you can actually finish it and go on to two more Minus Worlds.
If you beat those, you're taken back to the title screen and you can unlock hard mode. Was this a glitch or an Easter egg for the Japanese audience?