The object of this two-player game is to arrange five marbles in a row. Sounds simple enough- but the Pentago game board comprises four 3x3 grids, each of which can be twisted 90 degrees, carrying your marbles along in the direction your opponent prefers. Selected as a game of the year by Mensa in 2006, Pentago is simple to learn yet offers strategy challenges for kids and adults. Ages 6 and up.