This exciting game has over 50 levels and 500 paintings by Audubon. Each level is a bit harder and the credits keep increasing. It takes about an hour and a half to go through all the levels and you can get over 25,000 credits. Also, each level, the points for identifing a bird goes by 2. Every time you login you receive a different set of birds to start the game, but the birds stay the same during your login to make it easier to learn them and earn credits.