You love calculating? Did you ever try to solve equations when looking at the plate of the car driving in front of you? Just to keep your brain busy? Well, I did so for years, and I thought there might be other people in the world exercising their brain in the same way. You now no longer need to take the road to get new numbers for which you want to try to find a solution. The app comes with equations of four, five and six digits and you can compare your performance to that of other players