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PC "O" Games
- O.R.B.
- Oasis
- Obscure
- Oddworld 2: Abe's Exoddus
- Oddworld: Abe's Oddysee
- Odium
- Odyssey
- Of Light and Darkness
- Official Formula One Racing
- Oil Tycoon
- Omar Sharif Bridge
- Omar Sharif Bridge II
- Omikron: The Nomad Soul
- One Must Fall Battlegrounds
- Oni
- Onimusha 3: Demon Siege
- Open Kart
- Open Season
- Opening Weekend Deer Season
- Opening Weekend Varmint Hunter
- Operation Blockade
- Operation Flashpoint Expansion: Resistance
- Operation Flashpoint: Cold War Crisis
- Operational Art of War 2 Flashpoint Kosovo
- Operational Art of War Vol 1
- Oregon Trail 3rd Edition
- Origin of the Species
- Original War
- Othello
- Outburst
- Outcast
- Outdoor Life Sportsman's Challenge
- Outlaw Chopper
- Outlaws
- Outlive
- Outpost
- Outpost 2: Divided Destiny
- Outwars
- Overdrive