On a turn, move one of the tokens 1-3 spaces clockwise around the central board, skipping occupied spaces, to land on an empty space. You then take the top tile next to this token and add it to your board. You can expand out or up or both, but you want to ensure that you have a spout at your highest level and water flowing through all of your lower levels or else you'll have dead zones that won't score. If you stop next to the tiny oval features instead of a tile stack, choose one of these features and add it to an empty space in your fountain.