There are 4 boxes(A, B, C, D) each having a set of 3 integer values. You have to quickly sum up all the numbers of all the boxes. In a few seconds, all the boxes will hide. Now you will be asked to combine the sum of any two boxes. You need to write that value. An on-screen keyboard is given. You have to tap the correct value box. Each Right answer will earn you one point. A wrong answer will end your game. There is a timer also. So you have to quickly react. There are 3 game modes, each having its own difficulties and reaction time.