To remove the Snow from the Ninja's environment, you need to fully close the App.  

To fully close Clumsy Ninja on iOS 6 or earlier, follow these steps:

  1. Return to the iOS home screen 
  2. Double tap the Home button on your device. If done correctly, a row of apps will slide open at the bottom of the screen 
  3. Press and hold the Clumsy NInja icon in this bottom menu
  4. After a second, a minus sign should appear at the top corner of the app icon. 
  5. Tap the minus sign to fully close the app. 

To fully close Clumsy Ninja on iOS 7, follow these steps:

  1. Return to the iOS home screen
  2. Double tap the Home button on your device. If done correctly, you'll be shown screenshots of all open apps.
  3. Swipe Clumsy Ninja off the top of the screen to close it.

If you would just like the Snow Machine to stop producing snow, simply tap on the Snow Machine. Tap it again and it will start snowing again.