Just Cause 2 is one of the most insane games in recent memory. It's the kind of game that lets you grappling-hook two planes together and watch them spiral toward one another in a cyclone of fiery death, or hijack a helicopter in midair.

How can a group of modders make it even crazier? By adding multiplayer, of course!

They've even got the endorsement (unofficial as it may be) of the game's lead level designer, Magnus Johansson, who tweeted, "It's crazy to see what you have done with our game. Loved that buses and jets clip!"

So did we, Magnus. So did we.

What other single-player games deserve multiplayer? Tell us in the comments or on Twitter.

[via CVG]