A Mensa Best Mind Game, Games 100 Selection, and Dr. Toy Award Winner! Created by Maureen Hiron. If you enjoy Uno(TM), double your fun with Duo! Be the first one to play all your cards to the discard piles, matching two out of three elements on the cards: colors, numbers, and symbols. A lively, fast-paced game for two or more players, ages 7 to adult. If you prefer to order by telephone or by fax, click here for more information. Product Number USDU64