- Offroad Truck Simulator: Heavy Duty Challenge – v23.9.1314.0
- Ogu and the Secret Forest: Deluxe Edition – v1.0 (Release) + Bonus Soundtrack
- Okami HD + CrackFix
- Old Evil – v1.03
- Old Gods Rising
- Old School RPG
- Old World: Ultimate – v.1.0.65077 + 2 DLCs
- OlliOlli World + 2 DLCs
- Olympic Games Tokyo 2020: The Official Video Game + Multiplayer
- Omega Quintet + All DLCs
- Omen of Sorrow
- Omensight: Definitive Edition- v1.04
- Omno
- Once a Tale + Windows 7 Fix
- Once Alive – v0.9.9.8
- Onde
- One Eleven – v1.3 + Bonus Soundtrack
- One Last Breath + Windows 7 Fix
- One Last Dinner + Windows 7 Fix
- One Last Memory
- One Late Night: Deadline
- One Military Camp – v1.0.0.0 (Release)
- One More Dungeon 2 – v1.0.3
- One More Gate: A Wakfu Legend – v20230920
- One More Night + Windows 7 Fix
- ONE PIECE ODYSSEY: Deluxe Edition + 6 DLCs
- One Piece Pirate Warriors 3: GOLD Edition + All DLCs
- One Piece: Burning Blood – Gold Edition (All DLCs)
- One Piece: Pirate Warriors 4 + 2 DLCs + Multiplayer
- One Piece: Unlimited World Red – Deluxe Edition
- ONE PIECE: World Seeker – v1.4.0 + 17 DLCs
- One Sole Purpose
- One True Hero – v1.0.1d
- Onechanbara Z2: Chaos
- Onee Chanbara ORIGIN: Deluxe Edition – v1.04 + 96 DLCs
- Onimusha: Warlords
- ONINAKI + DLC
- Onirike
- Only After
- Only One + Windows 7 Fix
- Only Up! + Windows 7 Fix
- Ooblets – v1.0.24_e_da + Windows 7 Fix
- Open Country – v1.0.0.2636
- Open Roads
- Operation Wolf Returns: First Mission – Build 12197373
- Operation: Polygon Storm – Deluxe Edition + DLC
- Operencia: The Stolen Sun – Explorer’s Edition
- Oppcium
- Opus Magnum – Build 7993169 (01.17.2022)
- OPUS: Echo of Starsong – Full Bloom Edition, v2.5.6 + Bonus Content