One of a series of Kosmos games based on the My Secret Unicorn books by Linda Chapman. In Germany, the series goes by the name, "Sternenschweif" (Star Tail) and the books are also published by Kosmos. Der steinerne Spiegel is based on the third book in the series, with the same name. There are 16 cards showing a combination of people, ponies, places and activities. There are also 16 tiles, each of which shows the individual people, ponies, etc. Players use the tiles to win the corresponding cards and the player who has the most cards at the end of the game wins.