I have a confession to make. I get addicted to achieving points, rewards, and rankings on iPhone games. Most people get addicted to one game or other at some point. We all crave the validation of a little gold star, of being told we've just levelled up! Earned a medal! Found a rare golden doubloon! Received 100 gold stars! And apps give you gold stars for everything. It feels good to receive a gold star. To be told you've accomplished something. To be able to see proof ofyour achievements. It's just a fact of human nature.