Dominoes domino sets commercially available are double six (with 28 tiles) and double nine (with 55 tiles). Larger sets exist and are popular for games involving several players or for players looking for long domino games. The number of tiles in a set has the formula formula_1 for a double-"n" set. The most popular type of play are layout games, which fall into two main categories, blocking games and scoring games. The most basic domino variant is for two players and requires a double-six set. The 28 tiles are shuffled face down and form the "stock" or "boneyard". Each player draws
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