- Obscure (4)
- Obsidian (1)
- Oddworld Series (4)
- Odin Sphere (8)
- In the role-playing video game Odin Sphere, gamers take control of the warrior princess Gwendolyn, daughter of Odin, and follow the threads of an intricately woven story. Sites include screenshots, video clips, cheats, and reviews.
- Okami (8)
- In the adventure video game Okami, players assume the role of a sun god who's attempting to restore life to a world devoid of colour. Sites include screenshots, cheats, video clips, and reviews.
- One Must Fall: 2097 (1)
- One Piece: Grand Adventure (11)
- Based on the comic book and anime series, the action adventure video game One Piece: Grand Adventure.allows players to follow Monkey D. Luffy as he searches for treasure. Sites include cheats, screenshots, video clips, and reviews.
- Oni (6)
- Onimusha 3: Demon Siege (9)
- In the action video game Onimusha 3: Demon Siege, the year is 1582, 10 years have passed since the events of Onimusha 2, and the famous warrior Samanosuke Akechi (Takeshi Kaneshiro) continues to fight the demons in his path. Sites include screenshots, reviews, cheats, and video clips.
- Open Season (24)
- Based on the animated movie, the video game version of Open Season sees a rowdy bunch of forest animals turn the tables on a group of unsuspecting hunters. Sites include screenshots, video clips, and news.
- Operation Flashpoint: Cold War Crisis (3)
- Orphanage of Cast-Off Mascots, The
 - Adopt one of these long-lost advertising icons from dubious and defunct consumer products of the forties and fifties. - Otto Matic (2)
- Out of the Park Baseball 2006
- Official site for video game Out of the Park Baseball 2006. Gamers become the team manager and can set line-ups, demote struggling rookies, put injured players on the DL, and even scout for the amateur draft pool.
- Outfit, The (9)
- Set in Europe during WWII, The Outfit is a squad-based action video game that allows gamers to square off against the Nazi Army. Sites include cheats, screenshots, video clips, and reviews.
- Outlaw Golf (4)
- Outlaws (3)
- OutRun 2006: Coast 2 Coast (15)
- The racing video game OutRun 2006: Coast 2 Coast features 12 licensed Ferraris and 30 stages taken from OutRun 2 and the arcade game OutRun 2 SP. Sites include screenshots, cheats, video clips, and reviews.
- Outwars (2)
- Over G Fighters (7)
- In the action flight simulation video game Over G Fighters, players command more than 30 of the most powerful jet fighters and battle for air superiority in massive dogfights in the skies above Europe, Asia, Africa and North America. Sites include cheats, screenshots, video clips, and reviews.
- Over the Hedge (20)
- Based on the computer animated movie, the video game Over the Hedge allows players assume the roles of RJ the raccoon, Verne the turtle, Hammy the squirrel, and Stella the skunk in order to turn a suburban neighbourhood loaded with dangerous obstacles and traps into their personal playground. Sites include screenshots, reviews, and news.
- Overlord (12)
- The next-generation video game Overlord takes place in a twisted fantasy world where players have the choice to be evil, or really evil. Sites includes screenshots, video clips, cheats, and reviews.
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