Super Mario 64: The Green Stars is a Super Mario 64 rom hack made by Kampel, released in August 2013. Also listed under "hacking" in the credits are Kaze, Frauber and VL-Tone.
The hack has a number of differences compared to the original game, such as an increased count of 130 stars, harder level design, and (as the title implies) green stars. The game is intended as a fan-made sequel to Super Mario 64, and is often praised for feeling very similar to the original game.
The trio of authors power through the hack with incredible speed, showcasing the various levels and landscapes, abusing the game's programming errors, and collecting all 130 stars in under 100 minutes.
Note: There are encodes of higher resolution in the discussion thread.