Oh no, there's a problem in Terrever.

An earthquake drained all the water from the lake! In addition, the lake no longer fills as before. Dehydration threatens Bennie and his friends. Help Bennie by saving the village by building dams!

The goal is that you build a dam by making a row of at least 3 of the same heads and that the branches fall down. But beware, you only have limited time for this.