Aces of the Luftwaffe is an Android game where you can control your plane's flight and battle opponents by using your wrist-strapped Sony SmartWatch 2 as a controller. With the SmartWatch 2 or Sony's SmartBand, users can control game play by moving their wrists, freeing up the screen real estate of the phone or tablet to have an unobstructed view of the game.
The game looks pretty cool and with Android TV coming soon, it'd be interesting to see how wearables get integrated into console-like gaming experiences. The essence of pairing the SmartWatch 2 and using your wrist to control the game running on a phone or tablet is not dissimilar to using a Nintendo Wii controller.
Source: Xperia blog