Dominoes has a wide cultural reach, and consequently countless appropriations, with different rules and sets. There are official, and unofficial variations, universal rules and those that only that table in that square has. There are, however, more popular variations, at least market-wise. So, in your research, you will probably find three types of set: the standard, the Mexican, and the domino effect. The pattern, as we said, is the set called double six, which refers to the piece with the highest value, that is, with six points in each of the halves, twelve points in total. Recall, there are 28 pieces.