From the enclosed instructions:

Players (both readers and non-readers) work together in this co-operative game, using a combination of luck and simple strategy to help the fairies build a Fairy Ring. As with all fine fairy tales, there lurks a tricky troll in the background who would rather take over the beautiful Fairy Ring site for himself. A roll of the die can work in his favor, so players must figure out a strategy, using the fairy cards, to foil both the troll and lady luck.