On Linux X-Window, by Jim Zelenka, Steven Gifford, Andrew Plotkin & Co. October 1991.
This image of introduction looks like the one shown in our page Strategies, from the first Ataxx of 1990.
Dark 7x7 board, white and dark pieces, random blocks. The white human begins in top-left and bottom-right. 5 levels, the last is very slow. A sentence extracted from the presentation file :
It is a game of position and movement
There os a big lack of parameters menus in this game. Particularly, the move of pieces is too slow and it is impossible to change. But the computer player is good and the blocks configurations are rich.
This game, at the beginning on the X11R4 environment, now exists as a RPM package (distributions RedHat, Mandrake...) and is so easy to install on a Linux configuration.