This diagram shows the layout of balls for the beginning of a snooker game. Snooker is generally played on the same type of table as that used for billiards. The numbers for each of the spots represent the points value for the ball placed on them. Before the opening shot, or opening 'break', the cue ball is placed in the 'D'. The cue ball is also placed in the 'D' if it is potted or forced off the table. The red balls remain down once potted (struck into a pocket). After potting a red ball a player must nominate a colour of ball and attempt to pot it. If the coloured ball is potted, it is replaced on its initial spot. The player then tries to pot another red, followed by another colour, and so on until all the reds are down. The players must then attempt to pot the colours in numerical sequence, starting with the lowest value, the yellow. When the colours are potted in this latter stage of the game they are not returned to the table.