Tic-tac-toe on π₄

This program is a supplement to "Tic-Tac-Toe on a Finite Plane",
appearing in Mathematics Magazine, October 2004.

Just a few instructional notes before you play the game:  

In order to help you learn the winning lines, the program will audibly indicate that you have won or lost, but you
must identify the winning line.   The horizontal and vertical winners are easy to find.   I have included the
mutually orthogonal Latin squares beneath the game board to help you spot the others.   After you
get the hang of it, see if you can find a method that will produce a win every time.  

Click the board to play the game.

Thanks for playing.