Initially when entering the main interface of XO, you will enter the player names (2 people), then press Click to start the playing screen. XO will display a 3x3 chessboard, equivalent to each row or column having 3 cells, each player plays in their checkboxes (X or O). Each turn marked, XO will inform the currently played player whose it is and the current button in front of the player's name will turn green. When any side marks 3 horizontal, vertical or diagonal boxes with their mark first, that side will win. If all the boxes are checked but neither side wins, the match will be declared a draw by the XO.