We want to clarify that ads in the game are provided by external advertising networks, not directly controlled by the game itself. Unfortunately, this means we don’t have access to manage or influence when and how ads appear.
 
 
Please don't worry: if the button is grey and you cannot watch ads, the issue is temporary. Several factors might cause it:

• bad Internet connection;

• your advertisers may no longer have videos available for your location;

• exceeded the limit for watching ads.

That's why we recommend you:

1) Wait for a while for the ad limit to reset;

2) Check if your Internet connection is stable and connect to another network if necessary.

3) If you are an Android user, please clear the Google Play app cache.

We hope these tips are helpful to you!