| title | developer | year | platform | | pop. |
|---|
| UFO: Afterlight | ALTAR Games | 2007 | Windows | strategy role-play Science Fiction | image | subject | label | |
| UFO: Aftermath | ALTAR Interactive | 2003 | Windows | strategy Science Fiction | image | subject | label | |
| UFO: Aftershock | ALTAR Interactive | 2005 | Windows | strategy Science Fiction | image | subject | label | |
| Ultima IV: Quest of the Avatar | Origin | 1985 | C64 | role-play Fantasy | image | | label | |
| Ultima IV: Quest of the Avatar | Origin | 1988 | Amiga | role-play Fantasy | image | | label | |
| Ultima IV: Quest of the Avatar | Origin | 1986 | Atari 400/800 | role-play Fantasy | image | | label | |
| Ultima IV: Quest of the Avatar | Origin | 1988 | Atari ST | role-play Fantasy | image | | label | |
| Ultima IV: Quest of the Avatar | Pony Canyon | 1987 | Sharp X1 | role-play Fantasy | image | | label | |
| Ultima IV: Quest of the Avatar | ? | 1997 | Apple IIGS | role-play Fantasy | | | label | |
| Ultima IV: Quest of the Avatar | Newtopia Planning | 1987 | NEC PC9801 | role-play Fantasy | image | | label | |
| Ultima IV: Quest of the Avatar | Pony Canyon | 1988 | X68000 | role-play Fantasy | | | label | |
| Ultima IV: Quest of the Avatar | Origin | 1992 | FM Towns | role-play Fantasy | image | | label | |
| Ultima IV: Quest of the Avatar | Origin Systems | 1985 | MS-DOS | role-play Fantasy | image | subject | label | |
| Ultima IV: Quest of the Avatar | Pony Canyon | 1987 | NEC PC8801 | role-play Fantasy | image | | label | |
| Ultima IV: Quest of the Avatar | Origin | 1990 | Master System | role-play Fantasy | image | subject | label | |
| Ultima IV: Quest of the Avatar | Origin | 1987 | MICRO 7 - FM7 | role-play Fantasy | | | label | |
| Ultima IV: Quest of the Avatar | Origin | 1985 | Apple II E | role-play Fantasy | image | subject | label | |
| Ultima: Quest of the Avatar | Infinity;Atelier Double | 1989 | NES | role-play Fantasy | image | subject | label | |
| Ultratron | Puppygames | 2009 | Linux | shooter Science Fiction | image | subject | label | |
| UMoria | author | 1983 | Unix | role-play Fantasy | | | label | |
| UMoria | author | 1993 | Tandy Coco | role-play Fantasy | | | label | |
| Underrail | Stygian Software | 2015 | Windows | role-play turn-based | image | subject | label | |
| Underworld Online | author | ? | Linux | casino/cards Fantasy | | | label | |
| UnEpic | author | 2011 | Windows | action/reflex platformer role-play Fantasy | image | subject | label | |
| UnEpic | author | 2014 | Linux | action/reflex platformer role-play Fantasy | | | label | |
| UnEpic | author | 2014 | Mac OS X | action/reflex platformer role-play Fantasy | | | label | |
| Unreal | Epic Games | 2002 | Linux | shooter Science Fiction | | subject | label | |
| Unreal | Epic MegaGames;Digital Extremes | 1998 | Windows | shooter Science Fiction | image | | label | |
| Unreal | Westlake Interactive;Epic MegaGames;Digital Extremes | 1999 | Mac OS Classic | shooter Science Fiction | | | label | |
| Unreal Mission Pack: Return to Na Pali | Legend Entertainment | 1999 | Linux | shooter Science Fiction | image | | label | |
| Unreal Mission Pack: Return to Na Pali | Legend Entertainment | 1999 | Windows | shooter Science Fiction | | | label | |
| Unreal Tournament 2004 | Epic Games;Digital Extremes | 2004 | Windows | Science Fiction | image | subject | label | |
| Vampire: The Masquerade – Redemption | Nihilistic Software | 2000 | Windows | action/reflex role-play Fantasy | image | | label | |
| Vampyr: The Talisman of Invocation | author | 1990 | MS-DOS | role-play turn-based Fantasy | image | | label | |
| Venetica | Deck13 Interactive | 2009 | Windows | action/reflex role-play Fantasy | image | | label | |
| Venetica | Deck13 Interactive | 2009 | PS3 | action/reflex role-play Fantasy | | | label | |
| Venetica | Deck13 Interactive | 2009 | X360 | action/reflex role-play Fantasy | image | | label | |
| Wanderlust: Rebirth | Yeti Trunk | 2011 | Windows | action/reflex Fantasy | image | subject | label | |
| War of the Roses | Fatshark | 2012 | Windows | action/reflex Historical | image | subject | label | |
| Warp Rogue | ? | ? | Windows | role-play Fantasy | image | | label | |
| Warp Rogue | author | 2003 | Linux | role-play Fantasy | image | | label | |
| Warp Rogue | ? | ? | Mac OS X | role-play Fantasy | | | label | |
| Wasteland 2 | inXile entertainment;Obsidian Entertainment | 2014 | Windows | role-play turn-based | image | | label | |
| Wrack | Final Boss Entertainment | 2014 | Windows | shooter Science Fiction | image | subject | label | |
| X-COM: Apocalypse | author | 2014 | Linux | strategy Science Fiction | | | label | |
| X-COM: Apocalypse | Microprose | 1997 | MS-DOS | strategy Science Fiction | image | subject | label | |
| X-COM: Enemy Unknown | Microprose | 1995 | PS | strategy turn-based Science Fiction | image | subject | label | |
| X-COM: Terror from the Deep | Microprose | 1996 | PS | strategy turn-based Science Fiction | image | | label | |
| X-COM: Terror from the Deep | Microprose Software | 1995 | MS-DOS | strategy turn-based Science Fiction | image | subject | label | |
| X-COM: Terror from the Deep | Microprose Software | 1999 | Windows | strategy turn-based Science Fiction | image | subject | label | |
| X-COM: Terror from the Deep | ? | ? | 3DO | strategy turn-based Science Fiction | | | label | |
| X-COM: Terror from the Deep | ? | ? | Pandora | strategy turn-based Science Fiction | | | label | |
| X-COM: UFO Defense | Mythos Games | 1999 | Windows | strategy turn-based Science Fiction | | | label | |
| X-COM: UFO Defense | Mythos Games | 1994 | MS-DOS | strategy turn-based Science Fiction | image | subject | label | |
| X-COM: UFO Defense | Mythos Games | 1994 | Amiga AGA | strategy Science Fiction | image | subject | label | |
| X-COM: UFO Defense | Mythos Games | 1994 | Amiga CD32 | strategy Science Fiction | image | | label | |
| XCOM: Enemy Unknown | Firaxis Games | 2012 | Windows | strategy turn-based Science Fiction | image | | label | |
| XCOM: Enemy Unknown | Firaxis Games | 2013 | iOS | strategy turn-based Science Fiction | | | label | |
| XCOM: Enemy Unknown | Firaxis Games | 2013 | Mac OS X | strategy turn-based Science Fiction | image | | label | |
| XCOM: Enemy Unknown | Feral Interactive | 2014 | Linux | strategy turn-based Science Fiction | | | label | |
| Xenonauts | Goldhawk Interactive | 2014 | Windows | strategy turn-based Science Fiction | image | | label | |
| Xenonauts | Goldhawk Interactive | 2014 | Linux | strategy Science Fiction | | | label | |
| Ys Origin | Nihon Falcom | 2006 | Windows | action/reflex beat 'em up platformer role-play Fantasy | image | subject | label | |
| Ys: The Oath in Felghana | Falcom | 2005 | Windows | action/reflex beat 'em up platformer role-play Fantasy | image | subject | label | |
| Zezenia Online | K-Zodron | 2008 | Linux | role-play Fantasy | | | label | |
| Zombie Shooter 2 | Sigma Team | 2009 | Windows | action/reflex shooter role-play Horror | image | | label | |
