Holtz is an implementation of Zèrtz, an abstract strategy game for two players played with marbles on a shrinking board. It allows playing locally, over a TCP/IP Network, or against a rudimentary AI. It also offers some user hints.

Holtz is a realization of the abstract strategy game Z�rtz. It is meant for 2 players but is also funny with three. The players alternately set or knock out stones according to several rules and have to get a certain amount of white, gray or black stones