Squash is a racket sport played by two (singles) or four players (doubles) in an indoor four-walled court with a small, hollow rubber ball. The aim of the game is to take turns hitting the ball to the front wall, making the ball impossible to play, or forcing an error, from your opposition. The ball can only bounce once on the floor but can hit any of the other walls. After each shot you must try to get out of the way of both the ball and your opposition. 11 points are needed to win a game, with the best of three or five declared the winner of the match.