A mathematical card game which first appeared in 1964. The cards feature numbers and you must form pairs. A pair consist of a total on one of the two cards that is equalled when the two cards played are multiplied together. If you use all your cards first, the round ends and the player going out scores nothing but the other players take a negative score based on the cards still in their hands. To spice up play, there are Problem Cards which are nasty if you get caught with them in your hand when another player goues out. One of them is Mr Whacker, a school teacher who seems to like caning his pupils.