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Double-Nine Dominoes. A set of double-nine dominoes allows you to play some of the more complicated domino games. They can also be used to add variety to the simpler games, or to allow more people to play them. A double-nine set contains 55 dominoes, with the numbers on the tiles ranging from 0 (or blank) to 9. In a double-nine set, there are ten suits (blank, 1, 2, 3, 4, 5, 6, 7, 8, 9), each with ten members. A double-nine is the heaviest domino; a double-blank is the lightest domino value.
It isn't just one game, as many people think. There are many games and variations at many skill levels. Domino sets vary in size and complexity, according to the number of dots. This huge Double Fifteen set has 136 domino pieces, and each piece has from one to 15 color-coded dots on each end, or no dots (blank). The pieces can be used to play 20 different games; instructions for all the games are included.