Dominoes spots from one to six are generally arranged as they are on six-sided dice, but because blank ends having no spots are used, seven faces are possible, allowing 28 unique pieces in a double-six set. However, this is a relatively small number especially when playing with more than four people, so many domino sets are "extended" by introducing ends with greater numbers of spots, which increases the number of unique combinations of ends and thus of pieces. Each progressively larger set increases the maximum number of pips on an end by three, so the common extended sets are double-nine, double-12,
Mexican Train player to place all of their dominoes. Dominoes may be placed onto the player's train, onto the Mexican train if available, or on the trains of other players under special circumstances. The middle tile counts as the start of a player's multiple tile train. At the start of each round, the dominoes are placed face side down, shuffled, and drawn by players to form their hands. Using the double-nine set, players draw dominoes as follows: Any remaining dominoes are placed to one side, forming the "boneyard". With a standard double-twelve set the double twelve is placed in the station. In