This application asks to calculate the algebraic sum of two numbers that belong to the set of integers (this set contains all positive and negative integers including zero) and are between -10 and 10, the result is presented in one of three buttons, if the player chooses this button hits the answer, the screen turns green and adds a point. If you choose the button with the wrong answer, the solution is presented with an explanation. 20 questions are asked, so a player can get a maximum of 20 points.
As the player adds points the background of the screen changes. The screens are four patterns whose module is a smile ranging from angry to content.