Before there was Mario Maker, there were hackers that made level
designers available for old mario roms. In 2007 I started messing
around with these and made a few rom hacks, mainly "Super Mario
Bros: Jerry's Remix" which was really the only finished one (almost).
Among a few other attempts were "Super Mario Bros 2: Another World"
which was a one level deal, "Super Mario Bros 3 From Hell" and
"Super Mario Bros 3 Pink Version." There was also an attempt of a sequel that was
halfway made with more standard levels called "Super Mario Bros: Jerry's Remix 2". After all this I pretty much stopped.
I've always wanted to use some of the graphics tools and do a full overhaul starting with some levels from scratch.