Its a very fun app. It has two addictive games: 1. Decide Fast 2. How Many. In first game, you have to decide very quickly that which number is bigger or lesser. It looks simple but it gets very tricky as the game progresses. In second game, you will be shown one number written many times and you have to tell how many times does that number is written. Options are given on the same screen. 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.