Please ignore the fact that this game is Coke Zero-branded. The most important thing is that it's a location-based game for Tron: Legacy, which uses the iPhone's GPS for LightCycle battles on your daily travels.
The game revolves around the virtual Tron map, which is based on your own location. Gamers create light trails based on their movements, and once other people crash into your trails, you receive points. It's probably easiest if you watch the video above, and then download the free app for a go, if you've got an iPhone. Supposedly an Android version is on its way—with any luck before the movie opens in cinemas on December 17th. [iTunes via Coke via TechRadar]