Triominoes

upright=1.5|thumb|A game of Triominoes. Note how adjacent tiles are placed with matching corner values, and note the completed hexagon of six tiles (with corner values of 1 at the center). There are two uncompleted hexagons of five tiles, also with corner values of 1 at the center. One could be completed with the 1-1-3 tile, and the other cannot be completed, as the required tile would be 0-2-1, which does not exist. Triominoes is a variant of dominoes using triangular tiles published in 1965. A popular version of this game is marketed as Tri-Ominos by the Pressman Toy Corp.

==Composition== A triomino tile is in the shape of an equilateral triangle approximately on each side and approximately thick. Each point of the triangle has a number (most often from 0 to 5, as in the Pressman version), and each triomino has a unique combination of numbers, subject to the following restrictions: Any number is allowed to repeat in the combination. For example, 0-0-0 or 0-0-1 are possible combinations. When reading the numbers sequentially clockwise, starting with the lowest value, the numbers are not allowed to decrease. For example, 0-1-2 and 0-2-3 are possible, but 0-2-1 is not allowed. Given these restrictions, with the six potential values (0–5) commonly seen, there are 56 unique combinations, and thus the standard triomino set has 56 tiles. Larger sets are possible; for example, including 6 as a possible end number would result in 84 tiles.