The "Free" button you see while playing a regular level allows you to get Coins for watching an ad. If the game has not completed the connection to the ad, the button will not appear yet.

If you want to watch a video but do not have the option to do so, please try the following steps:
  1. Force close the game and make sure all apps running in the background are closed.
  2. Restart the game while connected to a strong internet connection.
  3. Leave the game open for several minutes.
  4. Enter a level
If you are still getting the message after taking these steps, the ad network is likely receiving too many requests. Please try again at a later time.