Addicted to brainy challenges? Enjoy playing Tic Tac Toe? Then fire up your competitive side with Otrio, the 2-4 player head-to-head strategy game! To win, get three pieces of your color in a row based upon similar size; lined up in ascending or descending order; or within the same space as three concentric pieces. The rules are simple, but the game is complex! Depending on the wit of your opponent, you may need to sharpen your strategic skills and exercise critical thinking! Straight out of the Brain Workshop, Otrio is a unique game that is engaging, challenging and beautifully built! The stunning game board is made of solid wood, giving players an elegant playing experience. Show off your smarts in a brainy showdown with Otrio! Marbles Otrio provides fun, cool games for family night that everyone will love!