 The basic premise of the game is a pitcher throws a half-ball toward a batter who swings at it with a stick or bat, and a catcher who tries to catch the half-ball, with bare hands.From there, rules vary greatly from state to state, city to city, and even block to block.The equipment for the sport consists of a broomstick or mop handle used as a bat, and a solid rubber ball cut in half, though in urban halfball games a bisected pimple ball or tennis ball is often used.