McDonald's: Pick N Play

McDonald's via DDB Stockholm recently used an interactive billboard game in Stockholm called Pick n' Play to offer free food from a nearby restaurant.
Pedestrians walking by were invited to use their smartphone as a controller in a digital paddle game similar to the classic Pong. By visiting the website, people could choose which reward they wanted and then use their finger to swipe up and down on their touchscreen phone to move the paddle. If they lasted more than 30 seconds, they got a coupon for the reward they chose and could collect their free fast food treat from a McDonald's restaurant.