Four's Vigor is a battle simulation board game for two players. It has one 4x4 cells board game and 10 pieces, 5 identical dark colored for one player, and 5 identical light colored for the other. The goal of game is to kill 2 pieces of opponent, or surround him as he can not move any more. During the game, when one piece is killed, if other four remaining pieces could make a straight line, the dead one can resurrect by four's vigor. —description from the designer