The Minus World is a glitch in Super Mario Bros. By passing through a solid wall near the World 1-2 exit, it is possible to travel to "World -1",[11] also known as the "Minus World" or "World Negative One". This stage is identical to Worlds 2-2 and 7-2, but on entering the warp pipe at the end, the player is taken back to the start of the level.[12] The same glitch in the Japanese Famicom Disk System version is considerably different and has three levels. World " -1" is a glitched world 1-3 that is underwater and contains Bowser, Hammer Bros., and multiple copies of Princess Toadstool. World " -2" is an identical copy of World 7-3. World " -3" is a copy of 4-4, but with flying Bloopers, no Bowser, and water instead of lava. After completing these, the player is returned to the title screen as if he or she completed the game.[