The Satellaview service was a cartridge plus service combo that gave access to small games you could play on the SNES. https://en.m.wikipedia.org/wiki/Satellav

The Satellaview service was a cartridge plus service combo that gave access to small games you could play on the SNES. https://en.m.wikipedia.org/wiki/Satellaview https://en.m.wikipedia.org/wiki/Satellaview https://en.m.wikipedia.org/wiki/Satellaview#/media/File%3ASatellaview_system.png https://en.m.wikipedia.org/wiki/Satellaview#/media/File%3ASa... There are ROMS available online for some games that existed and there are lists of all games, from the above I think the person found VHS footage from people playing the SNES with some specific f-zero tracks and from knowledge of the existing ROMs of f-zero used the VHS footage to reconstruct the track data, which I think is mostly tile positions, at least afaik the Satellaview games that were additions to existing games usually didn't add graphics only remixed what the game content was. I think I remember playing a Zelda that was just the map from the NES one with different objectives, so I am going from that.