Mercenaries 2 co-op developer walkthrough

We'll be honest: most of the staff at Joystiq has a serious medical condition that makes us physically unable to resist good co-op gameplay. We can't do it. It's a serious condition. There's only two known treatments: 1) massive amounts of mind-altering pharmaceuticals or 2) co-op video games. Sometimes, we're forced to seek out the former when there aren't any co-op games on the ol' release calendar while other times there are games like Mercenaries 2: World in Flames that would appear to provide enough co-op gameplay to keep us drug-free for a long time.

Above you've got another Mercenaries 2 developer walkthrough, this time sharing the wonders of the game's co-op functionality. Don't mean to brag, but we've already played it. That means you'll want to pay attention, lest you miss things like "drop-in," "drop-out," "campaign," and "explosion." Say, does anyone have an early copy of Castle Crashers, we're really hurting over here ...