- Obscure (April 20, 2005)
hints
- Obscure: The Aftermath (February 24, 2008)
savegame
- Odin Sphere (January 14, 2008)
hints
- Okage: Shadow King (April 13, 2004)
hints
- Okami (May 26, 2007)
action replay codes, hints
- One Piece: Grand Adventure (February 10, 2007)
hints
- One Piece: Grand Battle (September 01, 2005)
hints
- One Piece Grand Battle! 3 (October 23, 2004)
cheats
- One Piece: Grand Battle! Rush (September 01, 2005)
hints
- One Piece: Pirates' Carnival (October 28, 2006)
action replay codes
- Oni (September 14, 2004)
cheats, hints
- Onimusha 2 (March 27, 2004)
cheats, hints
- Onimusha 3: Demon Siege (October 11, 2004)
cheats, action replay codes, hints
- Onimusha Blade Warriors (July 23, 2004)
cheats, hints, guide
- Onimusha: Dawn of Dreams (April 16, 2006)
cheats, hints
- Onimusha: Warlords (January 11, 2004)
cheats, hints
- Open Season (October 28, 2006)
action replay codes
- Orochi Warriors (June 11, 2007)
hints
- Orphen (April 04, 2004)
cheats, hints
- Outlaw Golf 2 (November 11, 2004)
cheats, hints
- Outlaw Tennis (August 14, 2005)
hints
- Outlaw Volleyball Remixed (June 30, 2005)
cheats
- OutRun 2006: Coast 2 Coast (May 14, 2006)
cheats
- Over the Hedge (September 17, 2006)
action replay codes, hints
- Oz (December 17, 2007)
cheats, hints
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