Mac Concentration is best suited for System 7.0 or 7.1 and a 13' color monitor or greater. But it will run on System 6, and smaller monitors.
If you like the game please send ten dollars to Gladiator Graphics.
Please contact me if the game does not work for any reason on your Macintosh.
Expanding the game is very simple, please write me if you would like to know how to add or delete sounds, cards, or have the game changed to B&W or to have individual sounds assigned to cards (like phonics for each alphabet card, etc), or if you would like to help see the game translated into different languages.
