Now you can create your own Super Mario World levels, and play them. You'll need an emulator and ROM, unfortunately, and there's no way to load other peoples levels yet, which is a feature which would really be needed for it to take off, but this is still nevertheless a very cool creation.
It's actually quite old, and looks to have taken more than three years to develop (holy crap), but that's a hell of an effort to reverse engineer something like that all on your own. Nice work!
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