With Tic-Tac-Toe, the players take turns placing a piece of their colour in any spaces in a 3×3 grid. The player who succeeds in placing three respective pieces in a horizontal, vertical or diagonal row wins the game.
Nine-Digit is a single player game. The aim is to place the pieces which are marked with the numbers 1-9 in the 3x3 grid so that every row, column and diagonal adds up to 15.
