Play Super Mario World (Beta) Online

I first encountered the Super Mario World beta on a Super Nintendo Entertainment System emulator years after the official 1990 release. Nintendo developed and published the game, and this early version feels like a rough draft of a familiar classic, full of oddities that never made it to the final cartridge. It's a fascinating glimpse into the development process of one of the system's defining platformers.

You control Mario, or sometimes Luigi, and your goal remains the same: rescue Princess Peach by navigating a series of themed worlds. The beta includes several signature mechanics, like riding Yoshi, who behaves differently and can even breathe fire in some builds, and discovering alternate exits that lead to unexpected level variations. The pacing feels uneven, with some stages brutally difficult due to unfinished enemy placements or glitched obstacles, while others are surprisingly short and straightforward. Exploring these incomplete levels gives you the strange sensation of walking through a blueprint, where every jump might reveal something that was never meant to be seen.