The parallel world created by Google’s Niantic Labs for Ingress really shows off the potential of augmented reality gaming. It’s an MMO sci-fi game where you must choose factions and take part as the Resistance or the Enlightened. You fight over portals in real-world locations, and you can even suggest new entries. There are plenty of mysteries to solve; there’s a social collaborative aspect; and it encourages real-world exploration. It’s hard to explain, and it’s still in closed beta right now, but if you’re intrigued then request an invite here.