I've been playing this game for years now and it's pretty great. I'd give it 5 stars except that I bought the Premium subscription, which is quite reasonably priced, to get rid of ads. To maintain an ad free experience I have to click "Restore Purchases" button several times a day when the app somehow forgets that I paid. More importantly to me even is that the app only does this while it's still in memory which tells me the ad clients they use are merely lurking below the surface... shady.