Tic-tac-toe is a pencil-and-paper game for two players, 'X' and 'O', who take turns marking the spaces in a 3 x 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.
The layout of the Tic-Tac-Toe Cube was created in 2011 by Walter Randelshofer. The color scheme was created in 2011 by Phlip Boreysha.