- OURWORLD + Windows 7 Fix
- Out of the Park Baseball 23 – v23.1 Build 45
- Out of the Park Baseball 25 – v25.1 Build 46 + Windows 7 Fix
- Out of the Park Baseball 26 – v26.1 Build 39
- Out There: Oceans of Time – v1.2.0.14 (Redshift Update) + DLC
- Outbreak 2030 – v0.6
- Outbreak: Contagious Memories
- Outbreak: Epidemic – Deluxe Edition + 2 DLCs
- Outbreak: Shades of Horror – Chromatic Split
- Outcast: A New Beginning – v1.0.3.1 + Windows 7 Fix
- Outcast: Second Contact
- Outer Wilds: Archaeologist Edition – v1.1.10 + Echoes of the Eye DLC + Bonus Soundtrack
- Outlast 2
- Outlive
- Outliver: Tribulation – Build 13164078
- Outpath – v1.0.2
- Outpost: Infinity Siege – Vanguard Edition – v2.0.4d5d3f0.2024.0927.13 + DLC
- Outward – v2020.12.15 + 3 DLCs
- Outward: Definitive Edition, v1.1.0 + All DLCs
- OVE: The Sword of Liberation
- Over Islands – v2.0
- Overcooked! 2: Gourmet Edition + All DLCs
- Overcooked! All You Can Eat + DLC
- Overcrowd: A Commute ‘Em Up – v1.0
- Overgrowth
- OVERKILL’s The Walking Dead – v1.0.2 + 9 DLCs + Multiplayer + Updater
- Overload
- Overlord: Fellowship of Evil
- Overmorrow + Bonus Soundtrack
- Overpass 2: Deluxe Edition – v1.0.0-1892.84963 + 3 DLCs + Windows 7 Fix
- Overpass: Deluxe Edition – Build 13935 + 3 DLCs + Multiplayer
- Override 2: Super Mech League – Ultraman Deluxe Edition, Build 7411676 + 4 DLCs
- OveRRooT
- OXENFREE II: Lost Signals – v1.2.14
- Oxide Room 104
- Oxygen Not Included: Complete Bundle, vU55-663500-SCR + 4 DLCs/Bonuses
- Ozymandias: Bronze Age Empire Sim – v1.0.0.3
- P.A.M.E.L.A. – v1.0.0.2
- PAC-MAN MUSEUM PLUS + Bonus Figure Set DLC
- PAC-MAN WORLD Re-PAC
- Pacer
- Pacific Drive: Deluxe Edition – v1.6.2-CL27042 + 3 DLCs/Bonuses + Windows 7 Fix
- PACK MY STUFF
- Pact of Joy – v1.0.2
- Pagan: Absent Gods – v2.0.0.60421
- Painkiller: Complete Pack – Six Games + All DLCs + Bonus Content
- Paint the Town Red – v1.0.0 r5475
- PaintBall War 2
- Paleo Pines – v1.1.26
- Pandemic Train – v1.2.0