Minus World

The Minus World is a world that you can get via World 1-2 by using a glitch where you can slide through blocks, incorrectly causing the game to think you are in the World 4 warp zone. World -1, the most famous of the minus worlds, is World 7-2, but the pipe loops the level. The same applies for levels 2 to 3, however, However World -4 is a black game over screen. Originally, the world number would be 36, however Super Mario Bros. uses a blank graphic for the number 36, which is why we can't see the world number. 
In the original Famicom/NES version of the game, Minus World - 1 appears to be an infinitely looping 7-2 underwater level. After you reach the end of the level by entering the back, it warps you back to the start of the level, thus it is an effective softlock.
However in the Famicom Disk System version of the game, Minus World is completely different. You can progress through the levels. it goes through three different levels until players reach the goal and the game ending. Random Princess Peach and Bowser sprites seem to be scattered everywhere in the first level.
The reason why the two versions' Minus Worlds differ is due to the North American version using a cartridge and the Japanese version using a disk. Cartridges and disks arrange data in different ways, resulting in the different versions sending the offset the Warp Pipe receives arriving at a different byte in the programming.
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Category:Glitches
Category:Levels in Super Mario Bros.
Category:Levels