| Title |
Platform | Genre |
Score |
Release Date |
| Oddworld: Stranger's Wrath HD | Vita | Action Adventure | 8/10 | Dec 18, 2012 |
| Oddworld: Stranger's Wrath HD | PS3 | Action Adventure | 8/10 | Dec 21, 2011 |
| Officers: World War II | PC | Real Time Strategy | 7/10 | Jul 14, 2009 |
| Okabu | PSN | Puzzle | 6/10 | Oct 18, 2011 |
| Okamiden | DS | Action Adventure | 7/10 | Mar 15, 2011 |
| Ongaku | PC | Music/Rhythm | 7/10 | - |
| Operation Flashpoint: Dragon Rising | PS3 | First Person Shooter | 8/10 | Oct 6, 2009 |
| Operation Flashpoint: Dragon Rising | X360 | First Person Shooter | 8/10 | Oct 6, 2009 |
| Operation Flashpoint: Dragon Rising | PC | First Person Shooter | 8/10 | Oct 6, 2009 |
| Operation Flashpoint: Red River | PS3 | First Person Shooter | 7/10 | Apr 18, 2011 |
| Operation Flashpoint: Red River | X360 | First Person Shooter | 7/10 | Apr 18, 2011 |
| Operation Flashpoint: Red River | PC | First Person Shooter | 7/10 | Apr 18, 2011 |
| Orcs Must Die | XBLA | Tower Defense | 8/10 | Oct 5, 2011 |
| Orcs Must Die | PC | Tower Defense | 8/10 | Oct 11, 2011 |
| Orgarhythm | Vita | Music/Rhythm | 4/10 | Oct 23, 2012 |
| Overlord II | X360 | Action Adventure | 7/10 | Jun 23, 2009 |
| Overlord II | PS3 | Action Adventure | 7/10 | Jun 23, 2009 |
| Overlord II | PC | Action Adventure | 7/10 | Jun 23, 2009 |
| Overlord: Dark Legend | Wii | Action Adventure | 6/10 | Jun 23, 2009 |
| Overlord: Minions | DS | Puzzle | 4/10 | Jun 23, 2009 |