Back in 1990, Doom creator iD Software wanted to work on bringing smooth, sidescrolling gameplay to PCs, and they started out by recreating World 1-1 of Super Mario Bros. 3. The sprite for Mario was replaced by Dangerous Dave from the game of the same name by John Romero, and the recreation was lovingly dubbed “Dangerous Dave In Copyright Infringement.”
What started out as a joke became an aspiration, as iD Software would eventually create a demo for
Super Mario Bros. 3 on PC, this time not as a parody, but as a pitch to Nintendo. The demo was presented to Nintendo later that year, but Nintendo decided not to approve the project. 25 years later, John Romero has released footage of the actual demo that was pitched to Nintendo. You can check it out by clicking below!
Happy 25th Birthday, Commander Keen! In honor I'm sharing a video of our SMB3 demo we made for Nintendo on 9/28/1990.https://t.co/R2GlSYCoBM
— John Romero (@romero) December 14, 2015