Tic-tac-toe, also known as noughts and crosses or Xs and Os, is a simple paper-and-pencil game for two players, X and O, who take turns marking the spaces in a 33 grid. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row wins the game.
While tic-tac-toe is a simple game, there is a way to always win if you go first. The key is to control the center square. If you can place your first mark in the center, you will always be able to force your opponent to make a mistake.
