Ever wish that you could just whip out your Android device and harass a passer-by to play games with you? It's the sort of thing that Nintendo 3DS users, for example, have been using thanks to that company's StreetPass feature, but, until now, hasn't been available on Google's smartphones. Now, however, the company has an added an update to its games infrastructure that enables "ambient, real-time" games with more than one user - so long that the game relies upon Google's home-grown multiplayer backend. Still, maybe don't sprint into the street and start challenging people to a duel, because they might get the wrong idea.