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