Google Hangouts Development Sandbox is not Down, but Hiding

If you are developing a Google Hangout App, don’t be surprised if you press the “Enter a hangout in developer sandbox” link and get an ugly 404 error.  Take the resulting URL, that looks like:

grab the GID (in my case 110709744297), and form the URL:

and now you’re back testing again.  (last night I had an update for AnywhereBoardGames, and was greeted by this nasty surprise).