Today is the groundbreaking ceremony! Full of beans, the frog, rabbit, beaver and hamster want to build houses of different heights. It doesn't matter whether the buildings end up a little unsteady as long as no two floors are identical. If you decide to stop drawing cards at the right moment, you will be the happy winner in the end. In Biberbau & Co., players have to construct a house with two floors (for the frog), three floors (rabbit), four floors (beaver), and one with one to five floors for the hamster. They take turns drawing cards — which represent levels of a building — deciding after each draw whether to finish the house with the current number of levels for the specific kind of animal or continue drawing to go for a higher house worth more points in the end. If they draw two identical levels, however, the building is forfeited and their turn is over.