Hit the stop button when the rising number is as close to the goal as possible. Your distance from the goal will then be displayed, and the play button will work.

Known bugs: On some devices, the screen will flash and the number will be slow. I will fix the problem as soon as possible.---------I didn't specify what hardware or screen res is needed because I don't know.

I know it works on some hi-res, and on low-res but I'm not sure for every category. An update will be coming soon that hopefully will fix the flashing screen.