Online Tic Tac Toe Game:

Play Free Tic Tac Toe online against the computer (1 player) or against a friend (2 players).
Rules of the Xs and Os Game:
Tic-tac-toe is played on a 3x3 5x5 7x7 grid by 1 o 2 players, who alternately place the marks X and O in one of the nine spaces in the grid.
There is no universally-agreed rule as to who plays first, but in this article the convention that X plays first is used.
Players soon discover that the best play from both parties leads to a draw
Winner of the Noughts and Crosses game:
The player who succeeds in placing 3 (o 4) of their marks in a horizontal, vertical, or diagonal row is the winner.
The game has various names: Tick-tack-toe, tic tac toe, tick-tat-toe, tit-tat-toe, Xs and Os, noughts and crosses or naughts and crosses.