If you are getting a "Game is Unavailable" error, it means that the game has become blocked on your Facebook account. If you accidentally blocked the game, you can unblock the game via Facebook's Blocking Settings page, however, it is currently only possible to unblock games from a computer:

From a computer:

  1. Go to this URL: https://www.facebook.com/settings?tab=blocking
  2. Scroll down to the Block apps section.
  3. Locate the game and click Unblock

If you do not have access to a computer to perform these steps, please reach out to Facebook directly for assistance, as we are unable to access or modify your Facebook account settings.

For more information...

Please see the following Facebook support article: https://www.facebook.com/help/121070141307903