3 demo video with more on the port's brief history. Update: Romero updated the description for the Super Mario Bros. An alpha version of the 2016 title ran earlier this month. Id Software is currently working on a new version of Doom. It's the anniversary of that game that prompted Romero to share the storied Mario demo today. Nintendo turned down id Software's proposed port, and the team went on to develop Commander Keen instead. Known then as IFD (Ideas from the Deep), the team's take on Mario's classic NES adventure isn't the most faithful recreation aesthetically, but gameplay-wise, it's an impressive adaptation of Nintendo's side-scrolling formula. The video above shows a demo of the Nintendo game produced by future members of the id Software team in 1990, including Romero and co-founder John Carmack, which they later sent to the Mario makers themselves. John Romero, co-founder of developer id Software, uploaded footage of his PC port of Super Mario Bros.
