Plot: QuizUp is a discontinued mobile game originally developed and published by Iceland-based Plain Vanilla Games, and later operated by Glu Mobile. The game was a mobile trivia app similar to the game Trivial Pursuit. Wikipedia
Plot: Ruzzle is a mobile game developed by Swedish gaming company MAG Interactive and was first published in the Apple Store in March 2012. Ruzzle is inspired by the classic board games Boggle and Scrabble. Wikipedia
Plot: Kahoot! is a game-based learning platform, used as educational technology in schools and other educational institutions. Its learning games, kahoots, are user-generated multiple-choice quizzes that can be accessed via a web browser or the Kahoot app. Wikipedia