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A pentomino is a flat shape constructed of five squares that each touch one or more of their neighbours along any or all of the four sides.There are 12 unique pentominoes (under rotations and reflections); and one of each of these can be fitted (often with considerable difficulty) to exactly fill a number of rectangular grids, include 3x20, 5x12 and 6x10.
There is also a board game of skill based on it, called pentominoes.
The game is played on a 8x8 grid by two or three players. Players take turns in placing pentominoes on the board so that they do not overlap with existing tiles and no tile is used more than once. The objective is to be the last player to place a tile on the board.
The two-player version has been solved; it is a first-player win.
Pentominoes, and similar shapes, are also the basis of a number of other tiling patterns and puzzles.
Board games
