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- Obscure #254460 silver hackable
- Observation #906100 platinum hackable
- >observer_ #514900 platinum hackable
- OCTOPATH TRAVELER 0 #3014320 platinum hackable
- OCTOPATH TRAVELER II #1971650 platinum hackable
- OCTOPATH TRAVELER™ #921570 platinum hackable
- Oddworld: New 'n' Tasty #314660 gold hackable
- Of Ash and Steel #2893820 gold hackable
- Okami HD #587620 platinum hackable
- OK K.O.! Let’s Play Heroes #680700 gold hackable
- Omen of Sorrow #457260 hackable
- Omikron: The Nomad Soul #243000 silver hackable
- Ominous Horizons: A Paladin's Calling #3319590 hackable
- Omno #969760 platinum hackable
- One Piece Pirate Warriors 3 #331600 gold hackable
- ONE PIECE: PIRATE WARRIORS 4 #1089090 gold hackable
- One True Hero #1596170 pending hackable
- Onimusha 3: Demon Siege #6570 hackable
- Operation: Tango #1335790 gold hackable
- Orbo's Odyssey #2539960 platinum hackable
- Orcs Must Die! 2 #201790 gold hackable
- Orcs Must Die! 3 #1522820 platinum hackable
- Ori and the Blind Forest #261570 platinum hackable
- Outpost: Infinity Siege #1566690 platinum hackable
- Overcooked! 2 #728880 platinum hackable
- Overcooked! All You Can Eat #1243830 gold hackable
- Oxenfree #388880 platinum hackable
- PAC-MAN WORLD Re-PAC #1859470 platinum hackable
- Painkiller: Black Edition #39530 platinum hackable
- Palworld #1623730 protondb gold hackable