- Universe Sandbox
- Universe Sandbox ² (Update 24)
- Universe Sandbox ² (Update 26.3.1)
- Unknightly
- Unknown
- Unknown Battle
- Unknown Castle
- Unknown Fate
- Unknown Pharaoh
- Unknown Woods
- Unleash (Update 28/12/2018)
- Unlimited Escape
- Unlock Me
- Unlock The Cat
- Unlock The King
- Unlocked
- UNLOVED
- Unlucky Seven
- Unmechanical
- Unmechanical Extended
- UnMetal
- Unmoor
- Unnamed Fiasco
- Unnatural
- UNO (Update 13/05/2018)
- UNPLUGGED
- Unpossible v1.0.1
- Unrailed!
- UNRAVEL
- Unravel Two
- Unreal 2: The Awakening (GOG)
- Unreal Drone Racing
- Unreal Gold
- UNREAL LIFE
- Unreal Tournament 2003
- Unreal Tournament 2004 (GOG)
- Unreal Tournament 3 Black Edition
- Unreal Tournament: Game of the Year Edition
- UnReal World (v3.60 Beta)
- Unrect
- Unrest Indigo
- Unrest Special Edition (GOG)
- Unruly Ghouls
- Unruly Heroes (Update May 31, 2019)
- Unseen Diplomacy
- UNSIGHTED
- Unsolved Mystery Club: Amelia Earhart
- Unsolved Mystery Club: Amelia Earhart
- Unsolved Mystery Club: Amelia Earhart
- Unsolved Mystery Club: Amelia Earhart
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