On july 14, 2021, in video geme museum "Kyle orland of Ars technica" was found a copy of super mario bros. 3 pc port from Id Softwere. Students of video game history have long been aware of the existence of the demo, which was described in detail in David Kushner's excellent 2003 book Masters of Doom. id Software—then known as Ideas from the Deep (IFD)—coded the game in under a week and sent a copy to Nintendo in the hopes of getting a contract to develop an official PC port of the NES classic, which had launched in the US earlier in 1990.Part of what made the demo special was a John Carmack-coded scrolling algorithm that went way beyond the stuttering background movements and full-screen wipes you'd usually see in late '80s DOS games.Though the demo's existence has been well-known for a while, the closest the general public has gotten to it was a 2015 video released by John Romero showing many of the demo's levels and functionality. Fast forward to today, when Borman said he was surprised to find the demo sitting inconspicuously in a larger collection of donated software. The video link:https://www.youtube.com/watch?v=1YWD6Y9FUuw&t=61s