Some glues are banned from the sport because they emit dangerous gases and can help to increase the speed of the ball by up to 30kmp. The object of the game is to land the ball in the opponent's court, much as it is in tennis. At the serve, the player puts the ball on his or her open palm and tosses it up into the air by at least 16cm before hitting it with the racket. The ball must bounce on the server's side before crossing the net. If the ball hits the net but lands true in the opponent's court, a second serve is allowed.
Service is changed every five points.
The point is lost by whomever breaks the pattern. The first player, or team, to reach 21 points wins the game, unless the score reaches 20-20, or deuce, after which the winner is the player who gets 2 points ahead. If the server has not won the point by the thirteenth hit with the racket in any given rally, he or she loses the point.