It is a very useful app to improve your math calculation and keep your brain healthy. try to play this game for a few days and you will see that it helps to increase your mental calculation which is helpful at school or university.
There are two main modes, a single player and two players.
In first mode you are able to select which math operation you would like to train like addition, subtraction, multiplication and etc. After selecting appear a list of levels that you should to pass. Each level has some time and some number of questions. every question has multiple choice. When level is completed you can see your score.