Polo at night is played in an Indoor polo field which is made on sand, smaller than the traditional polo but with the same rules. It is played with teams of 3 players, and the game is divided into 4 chukkers.
The Indoor polo is a fast-paced version of the grass polo. The Hurlingham Polo Association (HPA, Great Britain) and the US Polo Association (USPA, USA) have established their own rules for indoor polo, and these rules are also often used in other countries.
Unlike outdoor polo, which is played on a 10-acre field, arena polo is played on a field 300 feet by 150 feet, surrounded by walls four or more feet high. The normal game consists of four chukkas, or periods, of seven and a half minutes each. An Indoor polo ball is similar to a mini soccer ball, larger than the hard plastic ball that is used outdoors, measures 12.5 cm in diameter.