Pentago is a board strategy game. Two players place in turns black and white stones on 6x6 square plane, then rotate one sub-squere. The one who manage to get five in a row first wins - Like tick-tack-toe, with a twist on a bigger board. Play with a friend or against a computer player. More descriptions and exact rules in the <a href="http://en.wikipedia.org/wiki/Pentago Wikipedia">page</a>.