Four square is the game of choice on many elementary school playgrounds. The court consists of a 16x16 foot square, divided into four boxes, labeled 1 through 4. The player in square 4 serves a big, bouncy, rubber playground ball, preferably red, to one of the other three players, who has to tap it into another player's square. The tapping goes on until somebody knocks the ball out of the court or can't reach the ball after it has bounced in his or her square. It's that simple. Or..it's almost that simple, as Bill Littlefield discovered.