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- Oozi: Earth Adventure #257990 silver unknown
- Operation Lovecraft: Fallen Doll #1685960 protondb silver unknown
- Operation: New Earth #528740 silver unknown
- Orange Moon #432950 silver unknown
- Orbital Racer #723100 silver unknown
- Orc Massage #1129540 silver native
- Our End of the World #703700 silver unknown
- Outcast 1.1 #336610 silver unsupported
- Outlaws + A Handful of Missions (Classic, 1997) #559620 silver unsupported
- Out of Reach: Treasure Royale #867400 silver native
- Out of the Park Baseball 25 #2384620 silver unknown
- Over 9000 Zombies! #273500 silver unknown
- Overkill's The Walking Dead #717690 silver native
- Painkiller: Recurring Evil #206760 silver unknown
- Painkiller Redemption #65560 silver unknown
- Paint Warfare #1190150 silver unknown
- Paladins® #444090 silver unsupported
- Panzer Corps Gold #268400 silver unknown
- Panzer Elite Action Gold Edition #292420 silver unknown
- Panzermadels: Tank Dating Simulator #379980 silver unknown
- Panzer Paladin #975510 silver unknown
- Paranormal #246300 silver unknown
- Pascal's Wager: Definitive Edition #1456650 silver native
- Pathologic Classic HD #384110 silver hackable
- Path Out #725980 silver unknown
- Pat & Mat #65710 silver unknown
- Pavlov #555160 silver unknown
- Pax Autocratica #1067360 silver unknown
- Pax Dei #1995520 silver native
- Penny Arcade's On the Rain-Slick Precipice of Darkness 3 #213030 silver unsupported