Kaizo Mario 64 is a ROM hack made by OmegaEdge29 in 2009. It contains 120 Stars and requires Mario to collect every last Star before he can enter the final stage, Bowser in the Sky. As the name suggests, this hack is intended to be a much more difficult version of the game (though nowhere near as difficult as some other hacks, such as Star Revenge 2: Night of Doom, or Super Mario Treasure World).

This hack does not alter the level geometry of any of the stages, but instead adds difficulty by moving, adding, and replacing the objects within the stages. In general, this hack was not designed with glitches in mind, so many Stars can be collected easily with trivial glitches or skips.