You are starting at lowest number and you need hit nearest higher number (for example … 1…3….7…10…etc.) Every correct hit gives you more time. Incorrect hit take your time. Every level you are starting at higher number as in previous level. You can buy many different background and skins for our special currency (stars) which you earn when you play.
Link for 0to100 project: https://connect.unity.com/p/0to100-availaible-on-googleplay