Title: U
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Unknown Horizons
simulation / city building
The Unknown Horizons Developers
2009 
Unturned
action / action-adventure
Smartly Dressed Games
2017 
Ultima Online
RPG / MMORPG
Origin Systems
1997 
Ultima 4: Quest of the Avatar
RPG / old school RPG
Origin Systems
1985 
Ultima Ratio Regum
RPG / roguelike
Mark Johnson
2020 
UnReal World
RPG / roguelike
Sami Maaranen, Erkka Lehmus
1992 
Ultima Worlds of Adventure 2: Martian Dreams
RPG / old school RPG
Origin Systems
1991 
UnNetHack
RPG / roguelike
UnNetHack team
- 
UFO: Alien Invasion
strategy / turn-based tactics
UFO: Alien Invasion Team
2010 
Ultimate Super Mario World
platformer
-
2012 
UFO 2000
strategy / turn-based tactics
Ufo 2000 Crew
2004 
Urban Terror
shooter / first-person shooter
FrozenSand
2011 
Universal Combat
simulation / space combat
3000AD
2004 
Unstrong
platformer
Origami Hero Games
- 
Umbrella Adventure
platformer
HiVE
2013 
Udoiana Raunes
adventure / point & click
Stefan Zwanzger Productions
1998