This game was really great in the beginning, but once you get several levels in then they start hitting you really hard with ads, and there's never enough energy to complete the harder levels. It very quickly became obvious that the makers of this game are just trying to get you hooked so you'll spend money on the in-app purchases which don't give you hardly anything for how expensive they are. So sad. It would have been a great game, but instead it's just a scam to get your money.