Very frustrating when it freezes and closes during game play. Should have a save function every 10 minutes or so when the game freezes like it has for me on quite occasions you don't lose any progress. Dropped the rating from 4 to 3 to 2 stars due the amount of times of it freezing up recently. Once it has been resolved I will increase my rating. Servers are to slow to keep up with the content. I play numerous games on my phone and this is the only one with an issue.