 | O.R.B.: Off-World Resource Base | PC | RTS |
7.0
|  | 04.11.2002 |
| Oasis | PC | strategy |
| | 12.04.2005 |
| Obscure | PC | action/adventure |
7.0
|  | 19.08.2005 |
| Obscure | PS2 | action/adventure |
7.0
|  | 01.10.2004 |
| Obscure | XBOX | action/adventure |
7.0
| | 01.10.2004 |
| Obscure II | PC | adventure |
7.0
| | 21.09.2007 |
| Obscure II | PS2 | action/adventure |
7.0
| | 07.09.2007 |
| Obscure II | WII | action/adventure |
7.0
| | 28.08.2008 |
 | Obscure: Dark Aura | PSP | adventure |
| | Н/А |
| Obscure: The Aftermath | PSP | adventure |
7.0
| | 09.10.2009 |
| Oddworld Stranger's Wrath | XBOX | FPS |
8.5
| | 04.03.2005 |
| Oddworld: Munch's Oddysee | GBA | platform |
4.0
| | 10.10.2003 |
| Oddworld: Munch's Oddysee | XBOX | adventure |
| | 06.11.2001 |
| Odin Sphere | PS2 | action/RPG |
8.5
| | 14.03.2008 |
| Odyssey: The Search for Ulysses | PC | adventure |
| | 02.01.2001 |
| Off-Road Redneck Racing | PC | racing |
| | 02.05.2001 |
| Ojaru-Maru DS: Ojaru to Okeiko Aiueo | DS | action/puzzle |
|  | 20.12.2007 |
| Okage: Shadow King | PS2 | RPG |
| | 01.10.2002 |
| Okami | PS2 | adventure |
9.0
| | 02.09.2006 |
| Okami | WII | adventure |
| | 28.03.2008 |
| Okamiden | DS | action/adventure |
| | Н/А |
| Okiraku Ping Pong | WII | sport |
| | 25.03.2008 |
| Omega 5 | XBOX360 | action/shooter |
| | 09.01.2008 |
| Omikron: The Nomad Soul | PC | adventure |
| | 02.11.1999 |
| Omikron: The Nomad Soul | DC | adventure |
| | 22.06.2000 |
| Omikron: The Nomad Soul | PSONE | adventure |
| | 02.11.1999 |
| Once Upon A Time in Japan: Earth | PC | adventure |
| | Н/А |
| One Must Fall: Battlegrounds | PC | action/fighting |
| | 18.03.2005 |
| One Piece | GBA | action/platform |
7.5
| | 07.09.2005 |
| One Piece: Dragon Dream | GBA | action |
| | 28.04.2005 |
| One Piece: Gear Spirit | DS | fighting |
| | 30.08.2007 |
| One Piece: Grand Adventure | PS2 | music action/party |
7.0
| | 29.08.2006 |
| One Piece: Grand Adventure | GC | music action/party |
7.0
| | 29.08.2006 |
| One Piece: Grand Battle | PS2 | fighting |
7.0
| | 07.10.2005 |
| One Piece: Grand Battle | GC | fighting |
7.0
| | 17.03.2005 |
| One Piece: Pirates Carnival | PS2 | music action/party |
5.0
| | 23.11.2005 |
| One Piece: Pirates Carnival | GC | music action/party |
5.0
| | 23.11.2005 |
| One Piece: Unlimited Adventure | WII | action/adventure |
| | 26.04.2007 |
| One Piece: Unlimited Cruise - Episode 1 | WII | action/adventure |
| | 11.09.2008 |
| One Piece: Unlimited Cruise - Episode 2 | WII | action/adventure |
| | 26.02.2009 |
