It displays a panel with numbers and operators for 30 seconds, reverses it, and then remembers and calculates the positions of the numbers and operators to match the numbers presented.

You can control the difficulty from a low number to a high number, a combination of addition and subtraction, and a combination of two operations. If the number of correct answers increases, you can move to the next level.

You can improve your short-term memory and improve your computing skills.