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Players choose or volley for first serve. Depending on the neighborhood, serve is maintained by winner of the volley or rotated every five points. In some games, only the server wins a point; others play so that either player can win any point. Twenty-one is usually the winning score, with the requirement of winning by two points.
The ball is slapped back and forth between boxes with an open palm. Slap the ball into your opponent's box; he or she returns it back to your box after one bounce or on the fly. If you step into the playing court, fail to return a shot, or if your return shot's first bounce lands out of your opponents box, you lose the volley.
"Box Ball," Online: http://www.streetplay.com/thegames/boxball.htm