In the best tradition of other Invicta classics, ZoneX is a combination of guessing and strategy. The object of the game is for one player (the Zone Breaker) to find the target point and set the other player (the Zone Maker) in a minimum number of moves. The game is played on a coordinate grid.
ZoneX was written by Jim Madehelm and published as type-in source code in Creative Computing Vol. 5, No. 7, July 1979.