So, you've read all about the ambitious multiplayer add-on that that a group of modders has been working on for the PC release of Avalanche's hit sandbox action game. You've seen the insane stuntsand unscripted chaos, and said to yourself, "Man, I want me some of that."

The fan-made add-on that's aiming to bring multiplayer to the PC version of Just Cause 2 came out of hiding last month. And lest you think that it might recede into the background again, here's proof that the JC-MP devs have been hard at work. The clip above is edited together from one player's session inside the…