Digittack is a game based upon the Sharp Wondertopia game calculator (that is, a calculator that shipped with a built-in game), manufactured in 1982.
Digits will appear and increase in value. Shoot them before they reach critical mass. Once they reach 9, they will be at critical mass and you have a short time to shoot them. Also, beware the squares, for which you have less time to shoot.
Beware if you miss, for once you miss 3 times, you will lose a life. You have 3 lives per level.
Remove exit button, as this causes issues on the framework on which this game is built. To exit, swipe up or press the home button. Closing can be done by swiping the app away in the overview.