This is the desciption from Ditto!'s web site www.dittothegame.com... It’s simple to learn and fun to play! The object of the game is to out-last your opponents by being the last player with cards in your hand. Whenever you win a round, your opponents discard their losing cards. But be careful, there are a number of “Trick Cards” that turn winning plays into losing ones, or force you to discard your hand. And then there’s the unstoppable “Boom!” card. The fun is endless - just keep your wits about you and you’ll emerge as the Ditto! champion!