We can all finally stop resorting to hokey FAQs to find Luigi buried deep within the castle in Mario 64 (I hear he hangs with Boo), all thanks to a computer-savvy fan.
Typically reserved for PC games, the TC-loving has been extended to the plumber's 3D debut. Dubbed The Missing Stars, not only does the emulator-only mod feature 38 stars in 10 new levels (!), it also includes a playable Luigi; a day/night cycle; custom music; modified enemies, objects and bosses; and a new final boss fight.
This is good, because I was beginning to think Luigi wasn't in the original game at all.