Choose whether you want an X or an O to be your mark. Have a friend, sibling, or parent be the other mark. Taking turns, make your mark in one of the nine tic-tac-toe squares. The object is to get three of your marks in a row — horizontally, vertically, or diagonally. If you have done this, draw a line through all three marks and yell “Tic-Tac-Toe.” You win!