Here is what you need to do, to get that game back again,
1. Click on Account from the Facebook toolbar
2. Select Privacy settings
3. Choose "Edit your lists" under Block Lists
4. Scroll down to "Blocked Applications"
5. Click "Unblock" next to thegame you wish to unblock.
2. Select Privacy settings
3. Choose "Edit your lists" under Block Lists
4. Scroll down to "Blocked Applications"
5. Click "Unblock" next to the
Note: You will need to allow access when you try to reload the Zynga games.