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- Orebound #2467810 gold unknown
- Organs Please #1593780 gold unknown
- Ori and the Will of the Wisps #1057090 gold native
- Oriental Empires #357310 gold unknown
- Original War #235320 gold unknown
- ORION: Prelude #104900 gold unknown
- Osiris: New Dawn #402710 gold unknown
- Ostriv #773790 gold unknown
- Otaku's Fantasy #712050 gold unknown
- Otherworld Legends #1761380 gold unknown
- Our Life: Beginnings & Always #1129190 gold unknown
- Ouroboros #822830 gold unknown
- OUTBRK #1107320 gold unknown
- OUTBUDDIES DX #1083310 gold native
- Outcast - A New Beginning #1013140 gold native
- OutDrive #441870 gold unsupported
- Outland #305050 gold unsupported
- Outlaws of the Old West #840800 gold unknown
- Outpost Zero #677480 gold unknown
- OUTRIDERS #680420 gold native
- Out There Somewhere #263980 gold unsupported
- Overcast - Walden and the Werewolf #293180 gold unknown
- Overcooked #448510 gold unsupported
- Overcooked! All You Can Eat #1243830 gold hackable
- Overcrowd: A Commute 'Em Up #726110 gold unknown
- Overlord: Fellowship of Evil #306670 gold unknown
- Overlord II #12810 gold unknown
- Overlord™ #11450 gold native
- Override: Mech City Brawl #709440 gold unknown
- Overstep #1008580 gold unknown