See Doom Dev's Rejected Super Mario Bros. 3 PC Pitch Video

Back in 1990, before id Software made Doom and Quake, when they were known as IFD, designers at the studio wanted to make a PC port of platformer Super Mario Bros. 3. They created a prototype and pitched it to Nintendo. The Japanese game giant rejected it, and now footage of the ill-fated game has emerged.

John Romero, who worked on the PC port alongside John Carmack, shared a video of the demo on Vimeo today. December 14, 2015 is the 25th anniversary of side-scroller Commander Keen, which id Software went on to create after its Super Mario Bros. 3 demo was rejected.

It looks competent enough, with Mario zipping around a colorful world in the Tanooki suit collecting coins and stomping on bad guys. But two things that immediately stand out are Mario's black eyes and the sounds being not what we're used to from a Mario game.

"id Software has always revered Nintendo," Romero, who no longer works for the company, said on Twitter today. "Their game designs were extremely influential and they saved the industry in 1985."

Nintendo never released an official PC version of Super Mario Bros. 3. The game debuted in 1988 in Japan for the NES, and was later released for the same platform in North America and Europe.

id Software is now working on a new Doom game, which is slated to launch in 2016 for Xbox One, PlayStation 4, and PC.