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A puzzle that involves tiles (or the concept of tiles) in the shape of 2x1 rectangles, divided into 2 squares, each containing 0 to 6 spots. It may require knowledge of general rules of the game, Dominos, or it may simply use the number of spots, on the tiles, as clues for a solution.

Dominoes (or dominos) is a game played with rectangular "domino" tiles. The domino gaming pieces make up a domino set, sometimes called a deck or pack. The traditional Sino-European domino set consists of 28 dominoes, colloquially nicknamed bones, cards, tiles, tickets, stones, or spinners.

Each domino is a tile in the shape of a 2x1 rectangle, with a line dividing its face into two squares. Each end is marked with a number of spots (also called pips, nips or dobs) or is blank. The value of either side is the number of pips. In the most common variant (Double Six) the values range from 0 (no pips) to 6. The sum of the two values, i.e. the total number of pips, may be referred to as the rank or weight of a tile, and a tile with more pips may be called heavier than a lighter tile with fewer pips. The backs of the dominoes in a set are indistinguishable, either blank or having some common design.

A domino set is a generic gaming device, similar to playing cards or dice, in that a variety of games can be played with a set.