Once again the popularity of Angry Birds has resulted in yet another collaboration. This time the collaboration is between Rovio and McDonald’s China which will see a location-based Angry Birds game. Basically what this does is that it allows Angry Birds gamers to unlock a variety of content, such as game modes, stages and power-ups depending on which McDonald’s outlet they are visiting in China. Taking it one step further, players will also be able to vote for their favorite McDonald’s branch in China, and the branch with the most popular votes will see a gigantic slingshot attached to McDonald’s famous golden arches. We’re not sure if we could be seeing such collaborations stateside or elsewhere, but it certainly sounds like a pretty good way of marketing, doesn’t it?