- Observation – v1.16
- Observer: System Redux – Deluxe Edition, BuildID 7368691 + OST + ArtBook
- Ocean Pressure
- Oceanhorn 2: Knights of the Lost Realm – v100.91363.230602
- Oceanhorn: Monster of Uncharted Seas
- Octopath Traveler + Update 1
- Octopath Traveler II – Build 10440977 (Denuvoless) + DLC + Bonus OST
- Octopath Traveler II – v1.0.2 + Ryujinx/Yuzu Switch Emulators
- Oddworld: Abe’s Oddysee – New ‘n’ Tasty
- Oddworld: Munch’s Oddysee HD + Update 14
- Oddworld: Soulstorm – Enhanced Edition
- Of Bird and Cage
- Offroad Horizons: Arcade Rock Crawling
- Offroad Mechanic Simulator
- Offroad Racing: Buggy X ATV X Moto
- Offroad Truck Simulator: Heavy Duty Challenge – v23.9.1314.0
- Okami HD + CrackFix
- Old Evil – v1.03
- Old Gods Rising
- Old World: Complete – v1.0.70360 + 4 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
- 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 – Complete Edition, v1.1.1.1429 + 3 DLCs
- 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 – Ultimate Edition – v1.0.8.0 + 17 DLCs
- 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