Browse Cheat Codes for Windows Beginning with O
- Obscure
- Obscure - The Aftermath
- Obsidian
- Ocean Trader
- Oddworld - Abes Exodus
- Oddworld - Abes Oddysee
- Odell Down Under
- Odieus Quest for the Magic Fling-Shot
- Odium
- Offensive
- Oh No More Lemmings
- Oil Tycoon
- Oil Tycoon 2
- Omikron - The Nomad Soul
- On the Ball - League Edition
- One Must Fall 2097
- One Step Beyond
- Oni
- Onimusha 3 - Demon Siege
- Open Season
- Operation Blockade
- Operation Body Count
- Operation Carnage
- Operation Flashpoint
- Operation Flashpoint - Cold War Crisis
- Operation Flashpoint - Red Hammer
- Operation Flashpoint - Resistance
- Operation Meteroid
- Operation Stealth
- Operation Thunderbolt
- Operation Wolf
- ORB
- Oregon Trail 3
- Orion Burger
- Out of This World
- Out to Lunch
- Outbreakers
- Outcast
- Outdoor Life - Sportsmans Challenge
- Outer Ridge
- Outlaws
- Outlive
- Outpost
- Outpost 2
- Outrun
- OutRun 2006 - Coast 2 Coast
- OutWars
- Over The Hedge
- Overboard
- Overdrive
- Oxyd
- Oxyd Magnun