TacTix is a variation of Nim, one of the oldest of mathematical games. It was invented by the brilliant Danish inventor Piet Hein in 1945. It is a two-player game, where the players take turns removing counters from the board. The goal is to force the opponent player to remove the last counter. You can play against your friends or if no one is available the computer program is always ready to challenge you. Note: you may download TacTix Pro (https://play.google.com/store/apps/details?id=com.o