Game updated and wiped out all progress, coins, etc. 0/5 stars. When it boils down to it, this game is about as stupid as they get- it's entirely about mining their coins, then buying stuff that lets you mine faster. That's really it, there's no skill, no challenge.. It's just a machine to get you to watch ads in exchange for their worthless currency, while killing your battery. By the way, the ad engine which the app talls bypass Google play, and fills you phone with utter cancer. Avoid!