Sethbling tracked down two cartridges for Super Mario World on the Super Nintendo Entertainment System, and he worked with some modders to jailbreak the copies and allow for physical mods.
By injecting code into the game’s cartridge memory, Sethbling and company were able to make it so that players could use the real cartridge to play with unique mods. All they have to do is select save file C from the title screen.
Here’s the whole thing in a video.
Being able to build a hex editor into the game without tinkering with the original cartridge is stunning, and it’s the stuff that would have absolutely blown my mind as a kid. Sort of wish I found a cartridge like this at my local Blockbuster back when I rented games.
Can you imagine how awesome it would be to find a modded version of Super Mario World back in the early 90s?
That’s the stuff dreams are made of.