Double Nine dominoes is a game played by two or more players. Each half of a domino tile is called an end. An end with no dots is called a blank and a tile with he same number of dots on both ends is called a doublet. The highest ranking tile in Double Nine dominoes is the Nine doublet or better known as "Double Nine". A set of Double Nine dominoes consists of 55 tiles or approximately twice as many tiles as a Double Six dominoes.