I'd give it zero star! DO NOT PLAY! I've play this game for more than 3 years. It was fun until there was more pop up ads popped in the middle of the game every few hours. And they try to "help" by offer you to buy pop ad remover. Very dissapointed and unpleasant ways of making money from the game. Would the app developer will take responsible if the ad was infected by a virus or scam and some users accidentally installed those virus bcause the ads was appeared randomly without any notice?!