| title | developer | year | platform | | pop. |
|---|
| Objects in Space | Flat Earth Games | 2019 | Linux | simulation manag./econ. strategy | | | label | |
| Olija | Skeleton Crew Studio | 2021 | PS4 | action/reflex platformer adventure | | | label | |
| Omegalodon | North of Earth | 2012 | Windows | action/reflex shooter | | | label | |
| Omegalodon | North of Earth | 2012 | Mac OS X | action/reflex shooter | | | label | |
| Omikron | Quantic Dream | 2000 | PS | action/reflex beat 'em up shooter adventure Fantasy | | | label | |
| Oolite | aegidian.org;Creative Commons | 2006 | Linux | shooter simulation flight Science Fiction | image | subject | label | |
| Oolite | aegidian.org;Creative Commons | 2006 | Unix | shooter simulation flight Science Fiction | | | label | |
| Oolite | ? | ? | Pandora | shooter simulation flight Science Fiction | | | label | |
| OpenGTA | Tok | ? | Linux | action/reflex racing/driving | | | label | |
| Phoning Home | ION LANDS | 2017 | Linux | | | | label | |
| Phoning Home | ION LANDS | 2017 | Windows | | | | label | |
| Pine | Twirlbound | 2019 | Windows | action/reflex Fantasy | | | label | |
| Pixel Survival | author | 2016 | Linux | simulation | | | label | |
| Pixture | author | 2015 | Linux | platformer role-play | | | label | |
| Planet Nomads | Craneballs | 2017 | Linux | action/reflex simulation adventure | | | label | |
| PlanetSide 2 | Sony Online Entertainment | 2015 | PS4 | shooter Science Fiction | image | | label | |
| PlanetSide 2 | Sony Online Entertainment | 2012 | Windows | shooter Science Fiction | image | subject | label | |
| PlanetSide 2 | Sony Online Entertainment | TBA | Linux | shooter Science Fiction | | | label | |
| Pokémon Legends: Arceus | Game Freak | 2022 | Switch | action/reflex role-play Manga | image | | label | |
| Poncho | Delve Interactive | 2015 | Linux | platformer puzzle Science Fiction | | | label | |
| Portopia Renzoku Satsujin Jiken | Chunsoft | 1985 | NES | adventure Manga | image | | label | |
| Project 5: Sightseer | Tasharen Entertainment | ? | Linux | action/reflex simulation racing/driving adventure | | | label | |
| Project Zomboid | The Indie Stone | 2017 | Linux | action/reflex role-play Horror | | | label | |
| Project Zomboid | The Indie Stone | 2014 | Mac OS X | action/reflex role-play Horror | | | label | |
| Project Zomboid | The Indie Stone | 2013 | Windows | action/reflex simulation role-play Horror | image | subject | label | |
| Prototype | Radical Entertainment | 2009 | Windows | action/reflex Science Fiction | image | | label | |
| Prototype | Radical Entertainment | 2009 | PS3 | action/reflex Science Fiction | image | | label | |
| Prototype | Radical Entertainment | 2009 | X360 | action/reflex Science Fiction | image | | label | |
| Prototype 2 | Radical Entertainment | 2012 | Windows | action/reflex Science Fiction | image | | label | |
| Prototype 2 | Radical Entertainment | 2012 | X360 | action/reflex Science Fiction | image | subject | label | |
| Prototype 2 | Radical Entertainment | 2012 | PS3 | action/reflex Science Fiction | image | | label | |
