- Subway Quiz - Vienna
- U.S. bubbles lite: US map quiz
- U.S. bubbles: US map quiz
- U.S. Historical Figures Quiz
- U.S. Presidents - APUSH Review
- USA Puzzle • Geography
- Uberwords - The Ultimate Brain Training Game to Elevate and Target your Anagram Genius!
- UK Road Signs Pro
- UK Trivia Extension
- Ulkoläksyt
- Ultimate Animal Sniper Shootin
- Ultimate Country Maps Trivia
- Ultimate English Spelling Quiz
- Ultimate Fan Quiz - One Direction edition
- Ultimate Movie Quiz (2023)
- Ultimate Presidents Quiz
- Ultimate Quiz for CS:GO & CS2
- Ultimate Room Escape 1
- Ultimate Room Escape 2
- Ultimate Tech Quiz 2021
- Ultimate Trivia & Quiz App – The Office
- Ultimate Trivia - Guess The Dog Breed
- Ultimate Trivia - Guess The Rappers
- Ultimate Trivia App – Once Upon A Time Family Quiz Edition
- Ultimate Trivia App –for I iCarly Fans and Free Quiz Game
- Quiz for The Giver
- Ultimate TV Trivia App - For Fuller House and Full House Quiz Free Edition
- Ultimate Weed Trivia
- Ultimate Word Search
- UMCG Anatomy Gym
- Umm: Super Simple Word Game
- Ummah Quizz
- UMPA: Play & Create Challenges
- Unblock Block Puzzle Game
- Unblock Board HD
- Unblock Car !
- Unblock Container Block Puzzle
- Unblock It - Block Jam Puzzle
- Uncar: Parking Unblock Puzzle
- Uncover
- Undead Cinderella
- Understanding Math
- Underwater Adventures - learning puzzle for toddlers and preschoolers
- Crocodile Sea Monster Survival
- Sea Turtle & Princess Mermaid
- Une Réplique Un Jour
- Unfortunate Events Trivia
- UNITE! - Puzzle Casual Game
- United Kingdom Puzzle
- United States & America Quiz
- United States Fun facts
- United States Map Quiz Game
- Universe Quiz
- Unlimited Halloween Wallpapers
- Unlimited Trivia
- Unlock Bar
- Unofficial Quiz for Mario
- Unofficial Quiz for Star Wars
- Unseen Empire: Animal ID Game
- Up and Down