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
42 (dominoes) five or nine), etc. When more than one domino of the same distance from seven is played, the first domino played is considered the winner. A player must bid at least 42 (one mark) to go in sevens, and losing even one trick will set the bidder. When a bid of "sevens" wins the contract, all players reveal their dominoes face-up and order them from sevens to maximum-away. Dominoes must be played in this order by all players. An even less common version of Sevens is looper, where the bidder takes it for less than 42 points (one mark) and