Plutonium Mario 64

Plutonium Mario 64 is a major ROM Hack made by usernamesarespiders, featuring 12 main courses with 101 Stars.

Originally dubbed Pluto Mario 64, it was an old Super Mario World hack the creator made years in the past but never was released in public until it was transitioned into Super Mario 64, and the title was named after the dwarf planet orbiting from the Sun, before changing the name after the radioactive chemical metal.