Simple TicTacToe

Please meet in the TicTacToe a simple game!

Rules of this game, and win arrange three words earlier than the computer.
You can be set in three stages the degree of difficulty Sat tic-tac-toe.

If you win the computer hard, you will highly recommend the head.
The outcome until the end of the game even if the decision, you can be an infinite war of the computer.
Sat for tic-tac-toe is simple, it is a good game that can be played in some time.