This hack tries to be a sequel or another version of the original Super Mario 64, in terms of level design, difficulty, and plot. It contains levels with similar design to the original Super Mario 64, and is overall very solid and fun. This ROM hack is considered to be one of the most famous.
It was released around Christmas 2011, and contains 130 Stars. Super Mario Star Road is a ROM Hack made by Skelux.
Super Mario Star Road - Updated Trailer (Download)