3D TicTacToe for GEOS by Marc F. Brouillette (Dated Oct. 28, 1990) - This looks like a neat version of an old classic that can be played with two people, or against the computer.  The game seems to run fine, but I couldn't figure out how to place my X or O.  If you have any insight, please drop a line using the Contact Us link in the banner.