The purchase of Eternal Darkness put me at 30 Gamecube games. I currently own 32.
Here's a list of GC games I own:
1080° Avalanche
4X4 EVO 2
Beyond Good & Evil
Big Mutha Truckers
Bloodrayne
Burnout 2: Point Of Impact
Dead To Rights
Eternal Darkness: Sanity's Requiem
Extreme-G 3
Future Tactics: The Uprising
James Bond 007: Everything or Nothing
The Legend Of Zelda Collector's Edition
The Legend Of Zelda: The Wind Waker
Luigi's Mansion (Player's Choice)
Mario Kart Double Dash!! (w/bonus disc)
Mega Man Anniversary Collection
Metroid Prime
Need For Speed Underground
Pikmin
R: Racing Evolution (w/ Pac-Man vs.)
The Simpsons: Hit & Run
Sonic Mega Collection
Spider-Man (Player's Choice)
Spider-Man 2
Super Mario Sunshine
Super Monkey Ball (Player's Choice)
Super Smash Bros. Melee
Teenage Mutant Ninja Turtles
True Crime: Streets Of LA
Viewtiful Joe
XIII
Zoocube