Stuck with unwanted advertisements in-game Whilst playing Angry Birds with my grandson, an ad for another game kept appearing. Despite trying to close this ad several times, I now find myself stuck with this game app on screen inviting me to download. 

All other 'buttons', features, refresh, etc are inactive. How do I escape from this app and return to the wanted game?
You can force the app to close and then reopen it:

 1. Double-click the Home button.
 2. Swipe left or right until you have located the app you wish to close.
 3. Swipe the app's preview up to close it.


Now reopen the app from the Home screen and you should be set.

Pro Tip: Sometimes tapping excessively with an app can cause it to slow down, freeze or lock up like you describe.