| title | developer | year | platform | | pop. |
|---|
| X Rebirth | Egosoft | 2015 | Linux | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| X Rebirth VR Edition | Egosoft | TBA | Linux | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| X Rebirth: Home of Light | Egosoft | 2016 | Linux | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| X Speed Race | Madalin Games | 2013 | Linux | racing/driving sport | | | label | |
| X Speed Race 2 | Madalin Games | 2014 | Linux | racing/driving sport | | | label | |
| X-Blades | Gaijin Entertainment | 2016 | Linux | action/reflex beat 'em up Fantasy | | | label | |
| X-Men | Pixel Technologies | 1995 | Mac OS Classic | adventure trivia/quiz | | | label | |
| X-Moon | Leafo | ? | Linux | | | | label | |
| X-note | Zeiva | 2011 | Flash | adventure | image | | label | |
| X-Plane 10 Global - 64 Bit | Laminar Research | 2014 | Linux | simulation flight | | | label | |
| X-Plane 11 | Laminar Research | 2016 | Linux | simulation flight | | | label | |
| X-Plane 11 | Laminar Research | 2016 | Mac OS X | simulation flight | | | label | |
| X²: The Threat | Egosoft;Linux Game Publishing | 2006 | Linux | action/reflex simulation flight manag./econ. Science Fiction | image | subject | label | |
| X²: The Threat | Egosoft | 2003 | Windows | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| X³: Albion Prelude | Egosoft | 2013 | Linux | simulation flight Science Fiction | | | label | |
| X³: Farnham's Legacy | EGOSOFT | 2021 | Linux | action/reflex simulation flight manag./econ. adventure Science Fiction | | | label | |
| X³: Reunion | Egosoft;Linux Game Publishing;Streamline Studios | 2008 | Linux | action/reflex simulation flight manag./econ. adventure Science Fiction | image | subject | label | |
| X³: Terran Conflict | Egosoft | 2013 | Linux | simulation flight Science Fiction | | | label | |
| X4 | Egosoft | TBA | Linux | action/reflex simulation flight manag./econ. Science Fiction | | | label | |
| X4: Foundations | Egosoft | 2019 | Linux | action/reflex simulation flight manag./econ. adventure Science Fiction | | | label | |
| Xbird | author | 2017 | Linux | | | | label | |
| XCavalypse | davevillz | 2016 | Linux | shooter | | | label | |
| XCOM 2 | Firaxis Games | 2016 | Linux | strategy turn-based Science Fiction | | | label | |
| XCOM 2 | Firaxis Games | 2016 | PS4 | strategy turn-based Science Fiction | | | label | |
| XCOM 2: War of the Chosen | Firaxis;Feral Interactive | 2017 | Linux | strategy | | | label | |
| XCOM: Enemy Unknown | Feral Interactive | 2014 | Linux | strategy turn-based Science Fiction | | | label | |
| XCOM: Enemy Within | Feral Interactive | 2014 | Linux | strategy turn-based Science Fiction | | | label | |
| Xcontractbridge | author | ? | Linux | casino/cards | | subject | label | |
| Xenion | Diecom;Computer Hut Software | 1987 | Tandy Coco | shooter Science Fiction | | | label | |
| Xeno Crisis | Bitmap Bureau | 2021 | Neo-Geo | shooter | | | label | |
| Xeno Crisis | Bitmap Bureau | 2019 | Mac OS X | shooter | | | label | |
| Xeno Crisis | Bitmap Bureau | 2020 | Dreamcast | shooter | image | | label | |
| Xeno Crisis | Bitmap Bureau | 2019 | Mega Drive | shooter | | | label | |
| Xeno Crisis | Bitmap Bureau | 2019 | Linux | shooter | | | label | |
| Xeno Crisis | Bitmap Bureau | 2019 | Switch | shooter | | | label | |
| Xeno Crisis | Bitmap Bureau | 2019 | PS4 | shooter | | | label | |
| Xeno Crisis | Bitmap Bureau | 2019 | PS Vita | shooter | | | label | |
| Xeno Crisis | Bitmap Bureau | 2019 | Windows | shooter | | | label | |
| Xeno Crisis | Bitmap Bureau | 2019 | Xbox One | shooter | | | label | |
| Xeno Crisis | Bitmap Bureau | 2021 | Neo-Geo | shooter | | | label | |
| XENOMARINE | Fourfold Games;Logophil | 2016 | Linux | adventure role-play Science Fiction | | | label | |
| Xenon Valkyrie | Diabolical Mind | 2017 | Linux | platformer role-play | | | label | |
| Xenon Valkyrie | Diabolical Mind | 2017 | Mac OS X | platformer role-play | | | label | |
| XenoRaptor | author | 2019 | Linux | shooter Science Fiction | | | label | |
| Xenosaga Pied Piper | Monolith Soft | 2007 | Mobile | | | | label | |
| Xenosaga Pied Piper | Monolith Soft | 2004 | Mobile | role-play | | | label | |
| Xerxon Defense | UpTime | ? | Apple II E | | | | label | |
| XGalaga | author | 1996 | Linux | shooter Science Fiction | image | subject | label | |
| XLarn | Swinfjord-Games | 2016 | Linux | adventure role-play | | | label | |
| XO | Jumpdrive Studios | 2015 | Linux | strategy Science Fiction | | | label | |
| xoEl Empire | Greyman Studios | 2017 | Linux | | | | label | |
| XorceD - Sashiro's Laedrum | Xorcerox | 2017 | Linux | adventure | | | label | |
| Xploquest | 33 Production | 2017 | Linux | | | | label | |
| Xplosive | Triple Team | 1995 | MS-DOS | action/reflex maze | | | label | |
| Xtom 3D | Jamie System Development | 1999 | Windows | shooter | | | label | |
