You might have seen the 2D flash version of Portal that came out around the same time that the full game from Valve did. Well I would say that someone over at Dice did, because here's the exact same thing for Mirror's Edge (a recent Parkour based FPS).

Interesting idea, I guess there's no better way to market a game than ... another game! Obviously a huge amount of effort has gone into making it, but I guess in terms of traditional marketing spend for these things it's a drop in the bucket. There's a lot of money being made selling games these days...