co-op multiplayer games for the gamecube

Game *	Players	Score	Genre	Release Date	Notes
Baldur's Gate: Dark Alliance	2	79	Role-Playing Game	November 19, 2002	confirmed
Barnyard	4	66	Adventure	August 1, 2006	search terms
Batman: Rise of Sin Tzu	2	63	Third-Person Action	November 11, 2003	confirmed
Conflict: Desert Storm	4	62	Third-Person Shooter, Action, Adventure	April 22, 2003	confirmed
Conflict: Desert Storm II - Back to Baghdad	2	73	Third-Person Action	January 6, 2004	confirmed
Digimon World 4	4	55	Role-Playing Game	May 31, 2005	confirmed
Dragon Ball Z: Sagas	2	48	Third-Person Action, Adventure	March 22, 2005	confirmed
Eragon	2		Action, Adventure	December 1, 2006	search terms
Fantastic Four	2	61	Third-Person Action, Adventure	June 28, 2005	confirmed
Final Fantasy: Crystal Chronicles	4	80	Action, Role-Playing Game	February 9, 2004	confirmed
Gauntlet: Dark Legacy	4	60	Action	March 7, 2002	confirmed
Gladius	4	82	Role-Playing Game, Action	November 3, 2003	confirmed
Harry Potter and the Goblet of Fire	3	69	Third-Person Action, Adventure	November 8, 2005	confirmed
Ikaruga	2	85	Action, Space Shooter	April 15, 2003	confirmed
James Bond 007: Everything or Nothing	2	84	Third-Person Shooter	February 17, 2004	confirmed
King Arthur	2	60	Third-Person Action, Adventure	November 16, 2004	confirmed
LEGO Star Wars	2	79	Third-Person Action, Adventure	October 25, 2005	confirmed
Legend of Zelda: Four Swords Adventures, The	4	86	Action, Adventure	June 7, 2004	confirmed
Lord of the Rings: The Return of the King, The	2	84	Third-Person Action, Adventure	November 5, 2003	confirmed
Mario Power Tennis	4	80	Sports, Tennis	November 8, 2004	confirmed
Monsters, Inc. Scream Arena	4	39	Action	September 16, 2002	confirmed
Mystic Heroes	4	67	Fighting, Action	September 30, 2002	confirmed
Nicktoons Unite!	4	xx	Action, Adventure	October 26, 2005	confirmed
Over the Hedge	2	61	Action, Platform	May 9, 2006	confirmed
Pikmin 2	2	90	Real-Time Strategy, Action, Simulation	August 30, 2004	confirmed
Rave Master	4	60	Action, Fighting	March 8, 2005	confirmed
Serious Sam: Next Encounter	4	69	First-Person Shooter	April 12, 2004	confirmed
Shrek 2	4	70	Action, Platform	May 3, 2004	confirmed
Sims 2, The	2	73	Simulation	October 24, 2005	confirmed
SpongeBob SquarePants: Lights, Camera, Pants!	4	xx	Party	October 21, 2005	confirmed
Star Wars Rogue Squadron III: Rebel Strike	2	75	Flight Action, Shooter	October 21, 2003	confirmed
Star Wars: The Clone Wars	4	73	Action	October 28, 2002	confirmed
Starsky & Hutch	2	59	Racing, Driving	January 16, 2004	confirmed
Tak: The Great Juju Challenge	2	75	Action, Platform	September 19, 2005	confirmed
Teenage Mutant Ninja Turtles	2	57	Action, Fighting	October 21, 2003	confirmed
Teenage Mutant Ninja Turtles 2: Battle Nexus	4	49	Action, Fighting	October 19, 2004	confirmed
Teenage Mutant Ninja Turtles 3: Mutant Nightmare	4	57	Action, Fighting	November 1, 2005	confirmed
TimeSplitters 2	4	88	First-Person Shooter, Action	October 15, 2002	confirmed
TimeSplitters: Future Perfect	4	82	First-Person Shooter, Action	March 21, 2005	confirmed
Tom Clancy's Splinter Cell Chaos Theory	2	81	Action, Adventure	March 29, 2005	confirmed
X-Men Legends	4	81	Third-Person Action, Role-Playing Game	September 21, 2004	confirmed
X-Men Legends II: Rise of Apocalypse	4	82	Third-Person Action, Role-Playing Game	September 20, 2005	confirmed
ZooCube	2	67	Puzzle	May 30, 2002	confirmed
43 games

This site is built by a ugly perl script that crawls metacritic. I'm not affiliated with them in any way. I just find their layout to be clean and easy to parse, and their game database seems to be very complete. Someday, I hope to discontinue this service when a major game site treats co-op multiplayer as a searchable game feature!