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| Game | Platform | Developer | Publisher (JP) | Publisher (NA) | Publisher (PAL) |
|---|---|---|---|---|---|
| OPUS: Prism Peak | Microsoft Windows, Nintendo Switch, Nintendo Switch 2 | SIGONO | Shueisha Games | Shueisha Games | Shueisha Games |
| Orange Season | Microsoft Windows, Microsoft Xbox Series X|S, Nintendo Switch, Sony PlayStation 5, macOS | Innerfire Studios | SODESCO | SOEDESCO | SOEDESCO |
| Orcs & Elves | Mobile, Nintendo DS | Fountainhead Entertainment, id | N/A | EA Mobile | N/A |
| Orcs & Elves II | Mobile, Nintendo DS | Fountainhead Entertainment, id | N/A | EA Mobile | N/A |
| Ore no Dungeon | Sony PSP | Climax Entertainment | SEGA | N/A | N/A |
| Ore no Shikabane wo Koete Yuke | Sony PlayStation, Sony PlayStation 3 | Alfa System, MARS | Sony Interactive Entertainment | N/A | N/A |
| Ore no Shikabane wo Koete Yuke (PSP) | Sony PSP | Alfa System, MARS | Sony Interactive Entertainment | N/A | N/A |
| Oreshika: Tainted Bloodlines | Sony PS Vita | Alfa System | Sony Interactive Entertainment | Sony Interactive Entertainment | Sony Interactive Entertainment |
| Orphen: Scion of Sorcery | Sony PlayStation 2 | Shade | ESP Software, Kadokawa Games | Activision | Activision |
| Orwell | Linux, Microsoft Windows, macOS | Osmotic Studios | N/A | Fellow Traveller | Fellow Traveller |
| Osouji Sentai Clean Keeper | Nintendo Wii | Lupinus | Idea Factory | N/A | N/A |
| Osteoblasts | Microsoft Windows | Moonana | N/A | Moonana | Moonana |
| Othercide | Microsoft Windows, Microsoft Xbox One, Nintendo Switch, Sony PlayStation 4 | Lightbulb Crew | N/A | Focus Entertainment | Focus Entertainment |
| Otherland | Microsoft Windows | Drago Entertainment, dtp Entertainment | N/A | Game OL | Game OL |
| Otome Daoshi -Fighting For Love- | Nintendo Switch | Idea Factory, Otomate | Idea Factory | Aksys Games | Aksys Games |
| OtterQuest | Microsoft Windows | Arkadia Galactic | N/A | Arkadia Galactic | Arkadia Galactic |
| Our World is Ended | Microsoft Windows, Nintendo Switch, Sony PS Vita, Sony PlayStation 4 | RED Entertainment | RED Entertainment | PQube | RED Entertainment |
| Outriders | Google Stadia, Microsoft Windows, Microsoft Xbox One, Microsoft Xbox Series X|S, Sony PlayStation 4, Sony PlayStation 5 | People Can Fly | Square Enix | Square Enix | Square Enix |
| Outward: Definitive Edition | Microsoft Windows, Microsoft Xbox One, Microsoft Xbox Series X|S, Nintendo Switch, Sony PlayStation 4, Sony PlayStation 5 | Nine Dots | N/A | Deep Silver | Deep Silver |
| Over the Alps | Apple Arcade, Microsoft Windows | Stave Studios | N/A | Stave Studios | Stave Studios |
| Overboard! | Microsoft Windows, Nintendo Switch, iOS, macOS | inkle Studios | N/A | inkle Studios | inkle Studios |
| Overfall | Linux, Microsoft Windows, macOS | Pera Games | N/A | Pera Games | Pera Games |
| OVERKILL | Microsoft Windows | Neople | Nexon | Nexon | Nexon |
| Overland | Apple Arcade, Linux, Microsoft Windows, Nintendo Switch, macOS | Finji | N/A | Finji | Finji |
| Oxenfree | Android, Linux, Microsoft Windows, Microsoft Xbox One, Nintendo Switch, Sony PlayStation 4, iOS, macOS | Night School Studio | Night School Studio | Night School Studio | Night School Studio |
