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) in some variants, three) marks are bid and the bidder must have four doubles. Jump bids are allowed for Splash and Plunge. All tricks must be won for a successful plunge bid. If the opponents win even one trick the plunge bid fails and the opponents get the marks. Another less common rule is to allow a player to bid Sevens. Instead of the highest domino winning each trick, the domino whose sum is closest to seven wins. Dominoes are classified as "sevens" (the 4-3, 5-2, and 6-1), "one away" (dominoes adding to six or eight), "two away" (adding to