This children's memory game features an electronic plastic cow and 4 milk glasses. On your turn, you take a cookie from the cookie jar and dunk it into one of the glasses. If you hear a 'Boing!', the glass is empty so put the cookie back. If you hear a 'Mmmooo', you found the milk that goes with that cookie - keep it and put it on your plate (the 'Mmmooo' moves to another glass). If you hear a 'Mmmooo' and the cowbell, you may trade plates with another player. The player with the most cookies on his or her plate when the cookie jar is empty is the winner. - BoardGameGeek