you deal out all the cards, and then you go around in a circle and every one must put down 2+ of matching cards (three 2's or four 5's.. etc) and you put them face down in a pile in the middle of the table. The person who gets rid of all their cards first wins. But the trick is that sometimes you can put down the wrong cards (for example, i say "three 4's" but only put down one 4 and 2 other cards). Now the other players can call you on it by saying "BS" and if they are right, you must take the entire pile in your hand, but if they are wrong, they must take all the cards. wow, its hard to explain in words.. did that make sense? lol