Museum obtains rare demo of id Software's Super Mario Bros. 3 PC

1990 demo was rejected by Nintendo but led to id's own Commander Keen.

Game Sound Museum ~Famicom Edition~ ND Super Mario Bros. 3 (2004) MP3 - Download Game Sound Museum ~Famicom Edition~ ND Super Mario Bros. 3 (2004) Soundtracks for FREE!

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Id Software's demo for Mario 3 on PC is now in a museum

Id Software's demo for Mario 3 on PC is now in a museum

List of unreleased media - Super Mario Wiki, the Mario encyclopedia

id Software - Wikipedia

Id's Super Mario Bros. 3 PC Port Donated To Video Game Museum

id Software 'Super Mario Bros. 3' PC Port Rediscovered

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The phantom PC version of 'Super Mario Bros. 3' by the developer of DOOM is stored in the History Museum - GIGAZINE

Museum obtains rare demo of id Software's Super Mario Bros. 3 PC port

Mario is Missing! - Super Mario Wiki, the Mario encyclopedia

Super Mario Bros. 3' Demo PC Port is Now in a Museum, A Rare id Software Project Scrapped by Nintendo

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Museum obtains rare demo of id Software's Super Mario Bros. 3 PC port