 Sets vary in the number of possible dots on one end, and thus of the number of combinations and pieces; the most common set historically is "double-six", though in more recent times "extended" sets such as "double-nine" have been introduced to increase the number of dominoes available, which allows larger hands and more players in a game.Muggins, Mexican Train, and Chicken Foot are very popular domino games.Texas 42 is a domino game more similar in its play to a "trick-taking" card game.