Its a very fun app. In this game, You will be shown two currencies. You have to decide very quickly that which currency is bigger or lesser as per the chart shown within the app.Tricky part is that there are many currency which have different values in USD. So you have to calculate them in your mind first then guess which has bigger or lesser value. 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 currency values is also given for your better understanding.