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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.

21 votes

Dominoroto-toto

So, any MUB must have at least two neighboring dominoes forming a $4 \times 1$ block. … If we use horizontally-oriented dominoes, we won't be able to fill the topmost. …
Victor Stafusa's user avatar