CLICK HERE TO TEST IT
All levels are stored as a prefabs inside the "Resources/Levels" folder. So you can change them and add a new ones.To setup the AdMob ads follow these steps:
Go to Assets - > Google Mobile Ads -> Settings and put your app id (from your AdMob console) there.
Open the script "Menus.cs" and put your interstitial ad id on line 43 for android and on line 45 for iOS.
To aim, drag your finger around the screen; to fire the ball, let go of it. Once the ball touches the goal, the level is finished. Try to finish each of the 51 levels.