PC cheats: O titles
| Game | Cheats | Updated |
|---|---|---|
| O.R.B. - Off-World Resource Base | 1 | Oct 14th 2005 |
| Obscure | 7 | Jan 13th 2005 |
| Ocean Trader | 1 | Oct 14th 2005 |
| OddBallz | 1 | Oct 14th 2005 |
| Oddworld: Abe's Exodus | 1 | Oct 14th 2005 |
| Oddworld: Abe's Oddysee | 1 | Dec 14th 2005 |
| Odell Down Under | 1 | Oct 14th 2005 |
| Odium | 2 | Oct 14th 2005 |
| ODT Escape: Or Die Trying | 1 | Oct 14th 2005 |
| Offensive | 1 | Oct 14th 2005 |
| Official Formula 1 Racing | 1 | Oct 14th 2005 |
| Official Team Manager (EA Sports) | 2 | Dec 16th 2004 |
| Oh No! More Lemmings | 1 | Oct 14th 2005 |
| Oil Tycoon | 1 | Oct 14th 2005 |
| Oldtimer | 1 | Oct 14th 2005 |
| Omikron: The Nomad Soul | 4 | Dec 16th 2004 |
| One Must Fall: 2097 | 24 | Aug 23rd 2005 |
| One Must Fall: Battlegrounds | 11 | Jan 13th 2005 |
| One Piece Grand Battle | 11 | Dec 16th 2004 |
| One Step Beyond | 1 | Oct 14th 2005 |
| Oni | 3 | Dec 16th 2004 |
| Onimusha 3: Demon Siege | 28 | Mar 21st 2006 |
| Onimusha: Warlords | 4 | Dec 14th 2005 |
| Operation Blockade | 1 | Oct 14th 2005 |
| Operation Bodycount | 2 | Dec 16th 2004 |
| Operation Carnage | 1 | Oct 14th 2005 |
| Operation Flashpoint | 2 | Oct 14th 2005 |
| Operation Flashpoint: Cold War Crisis | 4 | Dec 16th 2004 |
| Operation Flashpoint: Red Hammer | 1 | Oct 14th 2005 |
| Operation Flashpoint: Resistance | 1 | Oct 14th 2005 |
| Operation Meteoroid | 1 | Oct 14th 2005 |
| Operation Thunderbolt | 1 | Oct 14th 2005 |
| Operation Tiger Hunt | 2 | Dec 16th 2004 |
| Operation Wolf | 1 | Oct 14th 2005 |
| Orange Box, The | 10 | Jun 13th 2009 |
| Oregon Trail | 1 | Oct 14th 2005 |
| Oregon Trail 2 | 2 | Dec 16th 2004 |
| Oregon Trail 3 Anniversary | 1 | Oct 14th 2005 |
| Oregon Trail 3: 150th Anniversary | 1 | Dec 14th 2005 |
| Original War | 3 | Dec 14th 2005 |
| Oscar | 1 | Oct 14th 2005 |
| Out of this World | 1 | Oct 14th 2005 |
| Out To Lunch | 1 | Oct 14th 2005 |
| Outbound | 4 | Dec 16th 2004 |
| Outbreak | 1 | Oct 14th 2005 |
| Outbreakers | 1 | Oct 14th 2005 |
| Outcast | 1 | Oct 14th 2005 |
| Outdoor Life: Sportsman's Challenge | 1 | Oct 14th 2005 |
| Outer Ridge | 1 | Oct 14th 2005 |
| Outforce | 1 | Oct 14th 2005 |
| Outlaw Golf | 30 | Dec 14th 2005 |
| Outlive | 1 | Oct 14th 2005 |
| Outpost | 1 | Jan 28th 2007 |
| Outpost 2: Divided Destiny | 6 | Jan 28th 2007 |
| Outrun | 1 | Jan 28th 2007 |
| OutRun 2006: Coast 2 Coast | 2 | Jan 28th 2007 |
| Outwars | 2 | Oct 14th 2005 |
| Overdrive | 1 | Oct 14th 2005 |
| Overkill | 1 | Oct 14th 2005 |
| Oxyd | 2 | Dec 16th 2004 |
| Oxyd Extra | 2 | Dec 16th 2004 |
| Oxyd Magnum | 1 | Oct 14th 2005 |
| Oyomesan wa Hime Fujo | 1 | Oct 14th 2005 |