The idea of the game is to score points by putting the ball in the other team's goal. There are four, five minute periods, and the teams change ends between each period. If the game ends in a tie, a five minute break is taken, and then they play for two, three minute periods. Goalkeeper's may stand on the bottom, inside of their own 4M line. No other player may touch the bottom.
Players can score with any part of their body.
At least two players must touch the ball before a goal is scored. After the goal, the defending goalkeeper takes a goal throw from the goal line. Physically obstructing an opponant is a major foul, and the player must leave the water for 45 seconds, or until a goal is scored. If a player makes three major fouls, he is out of the game. Other fouls which are not as serious include using both hands to throw or catch, and pushing the ball under water.