The game consists of four building periods. Each player has an identical set of fifteen specialist cards, and each specialist comes with two abilities. At the beginning of each building period, each player needs to choose a hand of five specialists. If he then plays a specialist that no other player has remaining in his hand, he may use both abilities of that card; if two or more players play the same specialist, each of them may use only one of the two abilities. Exploiting the abilities of the specialists lets you collect resources, lay out new landscape tiles (e.g., ponds and pits), and build a variety of buildings. There are three types of buildings:
Immediate buildings with a one-time effect
Buildings that provide bonus points at the end of the game for various accomplishments
Mastering the balance of knowing the best specialist card to play and being flexible about when you play it ? together with assembling a clever combination of buildings ? is the key to this game.