| Title | Genre | Platform | Last Updated |
|---|---|---|---|
| Obscure: The Aftermath | Survival Horror | ps2 | February 8, 2008 |
| Odin Sphere | Role-Playing | ps2 | April 19, 2007 |
| Okami | Adventure | ps2 | September 19, 2006 |
| One Piece: Grand Adventure | Fighting | ps2 | September 12, 2006 |
| One Piece: Grand Battle | Fighting | ps2 | September 12, 2005 |
| One Piece: Pirates' Carnival | Party | ps2 | September 12, 2006 |
| Oni | Action | ps2 | December 12, 2004 |
| Onimusha 2: Samurai's Destiny | Action/Adventure | ps2 | December 12, 2004 |
| Onimusha 3: Demon Siege | Action/Adventure | ps2 | December 12, 2004 |
| Onimusha: Dawn of Dreams | Action/Adventure | ps2 | March 8, 2006 |
| Onimusha: Warlords | Action/Adventure | ps2 | December 12, 2004 |
| Open Season | Action | ps2 | September 20, 2006 |
| Outlaw Golf 2 | Sports | ps2 | November 25, 2004 |
| Outlaw Tennis | Sports | ps2 | February 7, 2005 |
| Outrun 2006: Coast 2 Coast | Racing | ps2 | April 20, 2006 |
