- Obscure (August 13, 2012)
hints, saved games
- Obscure: The Aftermath (August 22, 2012)
saved games
- Odin Sphere (January 14, 2008)
hints
- Okage: Shadow King (April 13, 2004)
hints
- Okami (March 29, 2009)
action replay codes, saved games, hints
- One Piece: Grand Adventure (January 26, 2011)
cheats, hints
- One Piece: Grand Battle (August 18, 2008)
saved games, hints
- One Piece Grand Battle! 3 (October 23, 2004)
cheats
- One Piece: Grand Battle! Rush (August 18, 2008)
saved games, hints
- One Piece: Pirates' Carnival (June 13, 2009)
action replay codes, hints
- Oni (September 14, 2004)
cheats, hints
- Onimusha 2 (September 12, 2008)
cheats, saved games, hints
- Onimusha 3: Demon Siege (February 17, 2014)
cheats, action replay codes, hints, saved games
- Onimusha Blade Warriors (July 23, 2004)
cheats, hints, guide
- Onimusha: Dawn of Dreams (February 17, 2014)
cheats, hints, saved games
- Onimusha: Warlords (January 11, 2004)
cheats, hints
- Onmyou Taisenki: Byakko Enbu (August 01, 2009)
hints
- Open Season (October 28, 2006)
action replay codes
- Orochi Warriors (June 11, 2007)
hints
- Orphen (April 04, 2004)
cheats, hints
- Orphen: Scion of Sorcery (December 07, 2010)
saved games
- 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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