Fun, but gets expensive fast. Unless you have money to throw away, I don't recommend this game. When you do spend money it doesn't go far. A few levels later, you're wondering why you spent $ just to be stuck again so quickly. It could be successful if they make the birds smarter and offered ads or other ways to get past hard levels. The economic model will cause this game to eventually fail. I usually quit playing it after a couple levels. Just not worth it.