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- OMSI 2: Steam Edition #252530 gold native
- Onechanbara Z2: Chaos #446390 gold unsupported
- One Finger Death Punch #264200 gold native
- One Piece Burning Blood #425220 gold unsupported
- One Piece Pirate Warriors 3 #331600 gold hackable
- ONE PIECE: PIRATE WARRIORS 4 #1089090 gold hackable
- One Way Heroics #266210 gold unsupported
- Onigiri #290470 gold unknown
- Onimusha: Way of the Sword #2638890 gold unknown
- Onirim - Solitaire Card Game #651470 gold unknown
- Onirism #1057640 gold unknown
- Only Lead Can Stop Them #1909100 gold unknown
- Onmyoji #551170 gold unknown
- On The Road - The Truck Simulator #285380 gold unknown
- Ooblets #593150 gold unknown
- Open Country #1192010 gold unknown
- Open World Game: the Open World Game #1144110 gold unknown
- Operation Babel: New Tokyo Legacy #548810 gold unknown
- Operation: Tango #1335790 gold hackable
- Operation Thunderstorm #837590 gold native
- Operation Warcade VR #639270 gold unknown
- 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
- Orcs Must Die! 2 #201790 gold hackable
- Orcs Must Die! Deathtrap #2273980 gold native
- Order of War™ #34600 gold unknown