The game itself is okay, but the makers have come up with every way imaginable to make you use the in-app purchased "gems". The worst one is running out of energy. The game wont work when you run out of energy (which happens quickly) and you must either buy more energy with gems or log out of the game for a while and come back to it later. While the game itself is okay, as I said in the beginning, its not worth the price of the gems simply to play it.