Unfortunately they don't quite have the balance right in this game. It's too bad. I really enjoy the gameplay. There are too many difficult (impossible) levels. I have even used helps and not been able to complete levels. Obviously you run out of these helps and have nowhere to go but spend real money. I'd happily watch ads to get gems to upgrade or buy the ridiculously priced helps/extend levels, but that's not an option. So be prepared to enjoy the game early, then get very frustrated.