The Three Sisters Rock Garden expansion is an additional scorepad that can be used with Three Sisters. The gameplay is simple, each time you draft a die in Three Sisters, you cross off one space matching the die value and whenever you complete a row or column with crossed off spaces, you choose an adjacent bonus that is used on your main sheets. The Rock Garden is a 3"x5" score pad with 50 double-sided pages. This was available as an add-on during the Motor City Kickstarter campaign.