There's an old saying: "Beating the snot out of people is better with friends." At least, we think that's a saying. It really doesn't matter, though, as the video above pretty much proves it anyway. When Zeno Clash: Ultimate Edition lands on XBLA, it will bring with it new co-op modes that weren't seen in the PC version. Specifically, the game will feature split-screen and online co-op in the Pit and Tower challenge modes, which will also include leaderboards.
So, if ganging up on helpless bad guys and pummeling them to death sounds like fun, you should probably keep an eye on Zeno Clash.