title: Hitting Back Button and then Resuming Activity
body: <p>I am developing a game for Android and have what I imagine to be a very common scenario, but I can't figure out how to do it.</p>
  
  <p>I have a Title Screen where the user can select "New Game".  When they start up a game, I push a GameActivity onto the stack.  Then if the user hits the physical back button the phone, the application goes back to the TitleActivity, as I intend it.  However, I need a way to allow the user to resume the game at this point, but I don't know how to get back to htat instance of the GameActivity.  Any help is appreciated.</p>