This game is amazing. For those of us who remember PalmOS, this is the same company that made Legacy in the early 2000's. I bought the entire collection for iOS and was so excited to see that Android had it now that I switched, AND it's on sale.
Note, the sale only covers the base game and the official expansion. All the other expansions are made by third parties, still fantastic, but are not included at the 50% sale.