Cory Arcangel’s Super Mario Clouds (2002-).

Super Mario Clouds is an old Mario Brothers cartridge which I modified to erase everything but the clouds. This project was very much in the line of the stuff that various Beige Programming Ensemble (RIP) reps were doing then. Anyway, check below for the ROM, source code, a gif, a scan of the cartridge, a video, and instructions on how 2 make it yourself.