A player cannot hit the ball twice. A point is gained when a team plays the ball in the opposition's court and the ball is not defended, therefore it lands within the court. The ball must be served (hit) from outside the court, otherwise, it will be regarded as a foul. The game is played in sets of 25 points (sometimes 21). The team that reaches 25 (or 21) points first, wins the set. Each game consists of 3-5 sets (or the first one to 3 in middle school). The fifth set is played to 15 points.