Tic Tac Toe

Tic tac toe is a game in which two players take turns drawing an 'O' or 'X' on a single grid consisting of nine squares. The winner is the main participant to get 3 identical marks in a row.
You probably already know how to play Tic Tac Toe. it's really easy entertainment, isn't it? that's what most people think. but if you ever really wrap your mind around it, you will find that Tic Tac Toe is not as easy as you believe it was.