We have something similar going at our office, but with a weekly ping pong ladder. You can challenge anyone above you on the ladder to a game. You win, you move up to the spot of the person you challenged. What is great is this ladder has software devs, sales guys, marketing and a couple of execs including the CEO in it.

I seem to gain respect from the sales guys and even the execs that I have played when I beat them and makes design conversations easier and more playful. It's good to see each other competing outside of the normal rules and structure of work.