Woolah - Knockout Photo challenges with your friends.
QuizUp - QuizUp gives you the opportunity to test your trivia skills against friends and strangers throughout the world.
SPAR! - Challenge your friends. Put money on the line. Get better.
Buzz! The Big Quiz - Buzz! The Big Quiz is a Trivia, Party, Single and Multiplayer video game developed by Relentless Software and published by Sony Computer Entertainment.
Trivia Crack - Produced by Etermax, Trivia Crack lets players answer trivia questions and compete against other people on mobile devices.
ShutterSpots - Find & share photo locations nearby & all over the world!