Heptalion is a special tiling game played on a diamond-shaped board of 56 squares depicting seven different symbols on them. Two players randomly draw tiles, but position them face up. The players struggle to place their 2-square tiles on the board so that both symbols of the tile match with the symbols of the two adjacent spaces on which the tile is placed. The last player placing a tile wins.
The special board configuration has the following properties:
A variant for three and four players is included in the rules.