Analysis of information sources in references of the Wikipedia article "Four square" in English language version.
Equipment: A large rubber ball, a court marked off into four squares labeled A, B, C, and D in sequence. Action: Four players are chosen to take up a position in each square of the court. The other players line up outside the square marked "A." The player in square "D" is the server. He begins the game by bouncing the ball in his own square and hitting it underhand, with both hands, into any other square. The receiver, in turn, attempts to hit the ball into one of the other three squares.
At the playground they play four square, ride on the swings, see-saws, and sliding board, and play on the bars.
