"Challenge Your Friends" is game which allows you and your friends to play two-player games on one device. Before you start any duel, the game gives you random challenge ("dare") which you can accept or decline. If you do accept it the game starts, and after the game is over you should do the challenge.
There are 4 games for now: Tic-Tac-Toe, PONG, Math Wars and Flappy Squares. I'm working to add more.
Google Play ID: jj.app.cyf (I can't post link because I'm new user)