| Game | Cheats List | |||
| Oh No! More Lemmings | Cheat Codes | |||
| Oil Rush | Trainer, Hints, Savegame | |||
| Oil Tycoon | Cheats, Trainers | |||
| Oil Tycoon 2 | Trainer | |||
| OIO: The Game | Trainer | |||
| Oknytt | Hints | |||
| Oldtimer | Cheat Codes | |||
| OlliOlli | Hints | |||
| Omar Shariff Bridge 2 | Trainer | |||
| Omerta: City of Gangsters | Trainer | |||
| OMG Zombies! | Hints | |||
| Omikron: The Nomad Soul | Trainer, Savegame, UHS Module | |||
| Ominous Objects: Lumina Camera | Hints | |||
| Once Upon a Knight | Cheat Codes, Trainer | |||
| One Finger Death Punch | Hints | |||
| Onefog Xonix | Savegame | |||
| One Must Fall: 2097 | Cheats, FAQ | |||
| One Must Fall: Battlegrounds | FAQ | |||
| One Piece: Romance Dawn - Bouken no Yoake | Hints | |||
| One Step Beyond | Level Codes | |||
| One Way Heroics | Hints | |||
| Oni | Cheat Codes, Cheat Enabler, Savegame, Trainers, Savegame Editor, FAQ | |||
| Oniken | Trainer | |||
| Onimusha 3: Demon Siege | Trainers, Savegame, No-intro patch, Hints | |||
| Onimusha: Warlords | Cheat Codes, Hints, Trainer | |||
| Onion Burger | UHS Module | |||
| OpenArena | Trainer | |||
| OpenIT | Trainers | |||
| Open Kart | Trainer | |||
| Open Season | Savegame, Hints | |||
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