QuizUp (free) - With over 500,000 downloads and being an award-winning multiplayer trivia game you will keep your brain in check with this trivia game. Challenge friends and meet new people who share your interests. Join a community of millions already playing the biggest trivia game in the world! Plus discovering like-minded people is easy and fun! You can find people based on their age, location and interest. When you find someone you think is interesting, break the ice by starting a conversation or challenging them in a topic you are both passionate about. The game challenges friends in any topic for a quick, real-time match or randomly play other people from around the world. Climb the ranks and claim your titles.