AVOID: Downrated for what I consider to be predatory in-app purchase practices. I unintentionally made a $100 in-app purchase and there is seemingly no path to a refund. I went through the process of contacting google and then the dev. in a timely fashion but they "do not provide refund service so far". The confirm button is close to the back button on my phone. I didn't use anything in the purchase. I realize this is partially my fault, but no one's perfect and it seems likely that a fair number of people will have this experience. Other reviews suggest that the app. is becoming regarded as a "pay to win" app and not a game of skill. Maybe they're also just making bank on human imperfection to some extent. Disappointed because I was somewhat enjoying the game. Now just seems like a money sieve.