- Unjumble Word
- Unjumbled
- Unknown Fate
- Unlink Lines
- Unlock Bar
- Unlock Block
- Unlock Box
- Unlock Brick
- Unlock Closed Prison
- Unlock It - A fun logic puzzle
- Unlock it - best game
- Unlock master!
- Unblock Wood Block Puzzle game
- Unlock Memory Game
- Unlock Red Block Free : Slide Block
- Unlock Rope
- Unlock The Ball Puzzle
- Unlock The Door!
- Unlock the King
- Unlock the mysteries
- Unlock!
- Unlock3D
- Unlockt
- Unlucky Boy Rescue
- Unlucky Boy Rescue 2
- Unlucky Boy Rescue 3
- Unnatural Disaster
- Unolingo: Crosswords Without Clues
- Unpack Gift Box
- Unplugged The Game – Charge me!
- Unpuzl Kidz
- Unpuzzle 3D
- Unquilt
- Unroll Ball - Rolling Ball
- Unblock The Ball Out Me Slots
- Unroll Ball Puzzle
- Unroll Ball Slide Puzzle
- Unroll Me 2
- Unscramble and build words
- Unseen Objects
- Unslice
- Unsolved
- Unslice
- Unsolved
- Unsolved: Hidden Mystery Games
- UNSW Colour Vision Suite
- Untangle - logic games
- Untangle 3D!
- Untangle Jewels™
- Untangle. Rings and Lines
- Untie the knots - Art of ropes
- Untie The Rope!!
- Until Dead - Think to survive
- Untitled Escape
- Untitled Escape 2
- UNWYND
- Un–Block Pics! Best Puzzle Game and Tangram Challenge with Matching Bricks for Kids
- UORiS
- UP 9 - Hexa Puzzle!
- Up Left Out
- Up Slide Down
- Up Spell by Up Games