| Game | Cheats List | |||
| Obscure: The Aftermath | Savegame | |||
| Okami | Savegame, Hints | |||
| Onechanbara: Bikini Zombie Slayers | Savegame, Hints | |||
| One Piece: Unlimited Adventure | Savegame, Hints | |||
| One Piece Unlimited Cruise 2: Awakening of a Hero | Hints | |||
| One Piece: Unlimited Cruise - Episode 1 | Hints | |||
| One Piece Unlimited Cruise: Episode 2 | Savegame | |||
| Onslaught | Hints | |||
| Open Season | Hints | |||
| Operation Wolf | Hints | |||
| Opoona | Hints | |||
| Osouji Sentai Clean Keeper | Savegame | |||
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