Tic-tac-toe is a fun game that you can play any time and anywhere as long as you have the app installed in your phone. Tic-tac-toe is a zero sum game, which means that if both players are playing their best, that neither player will win. However, if you learn how to play tic-tac-toe and master some simple strategies, then you'll be able to not only play, but to win the majority of the time. The object of Tic Tac Toe is to get three in a row. You play on a three by three game board. The first player is known as X and the second is O. Players alternate placing Xs and Os on the game board until either oppent has three in a row or all nine squares are filled.