Superfast Mario Bros. is a romhack of the original Super Mario Bros. game which can only be described as chaotic experience. The game speed has been jacked up extremely high, as well as framerules being reduced to 1 frame rather than 21, transitions are instant, and yet the game is still somehow playable. Not that it matters in a TAS setting that is.
Despoa speeds through every level in the game without using a warp in record time.
WARNING: This hack can be very visually glitchy and occasionally have moments of flashing lights which may be uncomfortable to some viewers.
Watch this run being played back on a real console.