Snooker means "obstacle", so it is sometimes called obstacle billiards. The ball used in this sport is about 3569 mm long and about 1778 mm wide. There are holes in the center of the four corners and two long sides of the table. The balls used are divided into 1 white ball, 15 red ball and 6-color ball (yellow, green, coffee, blue, pink and black) * * 22 balls. The order of hitting the ball is a red ball and a colored ball until all the red balls fall into the bag, then hit the ball one by one in the order of yellow, green, coffee, blue, pink and black, and finally the one with the highest score wins. Snooker is very popular in British, Irish, Canadian, Australian, Indian and other Commonwealth countries as well as Hongkong, and it is also developing rapidly in China.