co-op multiplayer games for the psp

Game *	Players	Score	Genre	Release Date	Notes
Alien Syndrome	4	50	Action, Role-Playing Game	June 1, 2007	search terms
Aliens vs. Predator	4		Third-Person Action, Adventure	November 1, 2007	search terms
Aliens vs. Predator 2	4		Third-Person Action, Adventure	November 1, 2007	search terms
Aliens vs. Predator: Requiem	4	51	Third-Person Action, Adventure	November 13, 2007	search terms
Brothers in Arms D-Day	2	65	First-Person Shooter, Action	November 7, 2006	search terms
Capcom Puzzle World	2	65	Puzzle	October 1, 2005	search terms
Cash Guns Chaos	8		Action, First-Person Shooter	February 1, 2007	search terms
Cash Money Chaos	8		Action, First-Person Shooter	February 1, 2007	search terms
Crash Tag Team Racing	8	68	Racing, Driving	November 9, 2005	search terms
Crash of the Titans	2	xx	Action, Adventure	October 2, 2007	search terms
Dungeon Siege: Throne of Agony	2	74	Action, Role-Playing Game	October 2, 2006	search terms
Dungeons & Dragons: Tactics	Multi	58	Turn-Based Strategy, Role-Playing Game	February 1, 2007	search terms
Eragon	2	59	Action, Adventure	November 14, 2006	search terms
Ghost in the Shell: Stand Alone Complex	4	61	Action	October 25, 2005	search terms
Harry Potter and the Goblet of Fire	3	70	Action, Adventure	November 15, 2005	confirmed
Hellboy	4	xx	Action, Beat-'Em-Up	June 1, 2007	search terms
Justice League Heroes	2	72	Action, Role-Playing Game	November 1, 2006	search terms
Marvel: Ultimate Alliance	4	81	Action, Role-Playing Game	November 1, 2006	search terms
Monster Hunter Freedom	4	70	Action, Role-Playing Game	May 23, 2006	search terms
Monster Hunter Freedom 2	4	72	Action, Role-Playing Game	September 1, 2007	search terms
Namco Museum Battle Collection	2	73	Action, Compilation	August 23, 2005	search terms
Sims 2, The	2	65	Simulation	December 7, 2005	confirmed
Snoopy vs. the Red Baron	4	76	Flight Action	October 1, 2006	search terms
Spider-Man: Friend or Foe	2	58	Action	November 1, 2007	search terms
Street Riders	2	49	Car Combat, Racing, Action	March 24, 2006	search terms
Twisted Metal: Head-On	8	79	Racing, Driving, Car Combat	March 15, 2005	search terms
Valhalla Knights	2	54	Action, Role-Playing Game	April 17, 2007	search terms
X-Men Legends II: Rise of Apocalypse	4	84	Third-Person Action, Role-Playing Game	October 19, 2005	confirmed
28 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!