Shigeru Miyamoto, the creator of Mario is well aware of this glitch. As a result, it will load a seemingly random combination of geometry, color palettes, enemies spawns and physics as the level. By holding A+Start after performing the cartridge swaps, the RAM will not be reset and the game will attempt to load World 1-1 from the part of code where the Tennis data is now being stored. This works because the RAM location that is updated in the code as Tennis is played happens to coincide with the place where level data is stored in Super Mario Bros. The amount of time you spend playing Tennis, as well as the match score when you remove the cartridge can all affect which of the 256 worlds you load into, and it's totally possible for you to end up in one of the standard 8 worlds by chance.

Reset the console, hold A+Start in the title screen, and voila, you will load into a glitched world. Remove the cartridge whenever you are ready, then put the Mario cartridge back in. Once the game has loaded, hit the reset button on your Famicom, then play a rally or two of tennis. Carefully remove the cartridge from your system and replace it with Tennis. Load up World 1-1 of Super Mario Bro s and wait for a few seconds. To do so, it will require the Famicom console, a Super Mario Bros cartridge (obviously) and a Tenniscartridge. RELATED: 10 Hidden Areas In Games We Should Have Never Found In The First Place This is because that dotted square is the 68th texture in the game, and that text box is simply programmed to display the texture corresponding to the world number. So how do you perform this glitch? You'll notice that it doesn't say 'World 68-3', but instead 'World Blue Dotted Square-3'. Levels like this are what you can come to expect from this glitch. Yes, that's Mario swimming through the sky and a flying headless Bowser. Mario swimming through the air in a glitched SMB world

Old games Super Mario Bros