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- Operencia: The Stolen Sun #985950 gold unknown
- Orangeblood #1042670 gold unknown
- Orbi Universo #1090670 gold unknown
- Orbox C #544180 gold unknown
- Orbt XL #615610 gold unknown
- OrbusVR: Reborn #746930 gold unknown
- Order of War™ #34600 gold unknown
- Orebound #2467810 gold unknown
- Organs Please #1593780 gold unknown
- 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
- Outlaws of the Old West #840800 gold unknown
- Outpost Zero #677480 gold unknown
- Overcast - Walden and the Werewolf #293180 gold unknown
- Overcrowd: A Commute 'Em Up #726110 gold unknown
- Overlord: Fellowship of Evil #306670 gold unknown
- Overlord II #12810 gold unknown
- Override: Mech City Brawl #709440 gold unknown
- Overstep #1008580 gold unknown
- Over the Alps #1227400 gold unknown
- Overthrown #1133500 gold unknown
- Pacific Drive #1458140 protondb gold unknown