Popular Tic Tac Toe

This game is Tic Tac Toe.
You can play it with a friend or against the computer.
It is for two players, represented by X and O, who take turns marking the spaces in a 3×3 grid. The X player usually goes first. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal row wins the game.
It is also called: tit-tat-toe , Naughts and crosses, Tick-tack-toe, tick-tat-toe, noughts and crosses, Xs and Os, tick tack toe, Tic-tac-toe, X's and O's, Exy-Ozys, Xsie-Osies