You get stuck on levels and forced to use all your boosters. Level 26 and i played it multiple times to get 10 smiles and used my boosters. Frustrating and it gives me a headache. Just proves no matter what you do you cant please everybody including the game makers unless they make you buy boosters. Also the ads. Each ad gives you one diamond and you need 10 diamonds to get one booster. Its cute and fun at first but too many glitches after i read all the other feedback and reviews. I agree.