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- Oakwood #890970 pending native
- Obliteracy #846340 pending unknown
- Oblitus #306440 pending unknown
- Oblivious Garden ~Carmina Burana #323490 pending unknown
- Obludia #314290 pending unknown
- Obsurity #1125110 pending unknown
- Obversion #1102040 pending unknown
- Occultus - Mediterranean Cabal #687760 pending unknown
- Ocean Rift #422760 pending unknown
- Oceanum Mortis #1116030 pending unknown
- Octave #537700 pending unknown
- Octodad (Student Edition) #2383860 pending unknown
- Oddventure #1235710 pending unknown
- O.D.T.: Escape... Or Die Trying #1898950 pending unsupported
- Odysseus: Long Way Home #348960 pending unsupported
- OESE #485600 pending unknown
- Of Bird and Cage #523770 pending unknown
- Of Blades & Tails #1768780 pending unknown
- Offendron Warrior #999200 pending unknown
- Office Management 101 #678390 pending unknown
- Office Run #2000180 pending unknown
- Offroad Mechanic Simulator #1387500 pending unknown
- Off-Road: Redneck Racing #2742010 pending unknown
- OFFSIDE #1066310 pending unknown
- Off the Record: The Italian Affair Collector's Edition #503070 pending unknown
- Off the Record: The Linden Shades Collector's Edition #466020 pending unknown
- O'Fox Life #719120 pending unknown
- Oh No! Bugs! #513980 pending unknown
- OH! RPG! #421810 pending unknown
- Ohr: אור #376480 pending unknown