Tic Tac Toe is one of the world's best known and easy to play games. You can play Tic Tac Toe almost any where any time. If you know what you are doing, you can't lose at Tic-Tac-Toe. If your opponent knows what they are doing, you can't win at Tic-Tac-Toe. The game is a zero sum game. If both players are playing with an optimal strategy, every game will end in a tie.