surely there is a key combo that will quit a game and go back to OS? ?
Yeah, there is, try {Ctrl}-{Left Amiga}-{Right Amiga} all at once. But if you've finished with the game or application, why would you need to quit it? You do know that it's safe to shut down an Amiga anytime without having to shut down anything as long as it's not writing to disk or the hard drive, don't you? It's not a Windoze PC or a Mac... :-D