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Super Mario World (USA) prototype discovered and released

Video game preservation site Forest of illusion has a lovely surprise for Nintendo fans as they have secured a prototype for Super Mario World (USA) and have not only showcased it, but they have released it for fans to enjoy. The prototype is from 25th October, 1990, which is before the iconic Super Nintendo game hit retailer shelves across the United States. Super Mario World (USA) features some different dialogue, visual changes, with plenty of additional debugging features being present. As it is a localisation prototype, there’s plenty of debugging options to play around with. For instance, you can walk Mario around the map and choose which stage to play, Mario can not die so you don’t have to worry about 1Ups, and you can choose any power-up that you want to use at any point. Here’s a video showcasing Super Mario World (USA) and you can find more at the link here.


  • The sign at Yoshi’s House has different shading and lettering.
  • Text box font is much slimmer than the retail version.
  • Numerous script differences.
  • Donut Plains 2, Donut Secret House, and “Funky” match the Japanese version.
  • Star Road stages lead to the various test stages.
  • Mario will not die upon the timer running out.
  • Various debugging features are enabled.
  • In the staff roll, Boo Buddies and Big Boo are referred to as Boo Diddly and Boo Jackson.
  • Font graphics from an early version of The Legend of Zelda: A Link to the Past can be found.


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