Its a very fun app. In this game, there is a bird fight for might i.e. whose weight is more. You will be shown two birds.You have to decide very quickly that which bird is heavier or lighter as per the bird weight chart shown within the app. It looks simple but it gets very tricky as the game progresses. It will confuse you very much that you wont be able to go long unless you have a very sharp mind. There are 3 game modes in each game having different time and different set of difficulties. Table of bird weight values is also given for your better understanding.