Description: Dominoes generally refers to the collective gaming pieces making up a domino set or to the subcategory of tile games played with domino pieces. Each domino is a rectangular tile with a line dividing its face into two square ends. Each end is marked with a number of spots or is blank. The backs of the dominoes in a set are indistinguishable, either blank or having some common design. The idea is to match the edges with the same symmetrical edges.