Robot Entertainment has unveiled a trailer for its sequel to their popular indie-game Orcs Must Die! The sequel, cleverly named Orcs Must Die! 2, will follow the formula of the original game. Players will defend a fortress against waves of orcs and other monsters using weapons, spells, and a variety of traps to massacre the interlopers. This time around, though, players will be able to team up with another player in co-op mode to more efficiently slaughter orcs.

“In 2011, we implored players to kill the orcs,” said Robot Entertainment CEO Patrick Hudson, on the company’s blog. “As many as possible. Yet, only 3.4 billion orcs have been slaughtered to date. The only way we will get to a respectable orc death toll is by adding another killing machine and cooperative play. Bring a friend and destroy the orcs!”

In addition to the War Mage players embodied in the first game, a new class, the Sorceress, will be on hand to lure orcs to their deaths using mind control and magic. The new game will feature a new campaign and, of course, new monsters to destroy with new defenses, traps, and magical trinkets. Also, the system to upgrade your fortress defenses had been redesigned, making it easier to spend ‘skulls’ and tailor your armory to your personal play style. Players who own the original Orcs Must Die on PC will get access to exclusive content in Orcs Must Die! 2.

Though no definite release date was announced, you will be able to smash orcs with a friend sometime this summer. And if you simply can’t wait to get your hands on the new title you can head up to the Penny Arcade Expo East in Boston this weekend, where the game will be playable at the Robot Entertainment booth.

Have a good tale to recount of how you’ve singlehandedly repelled thousands of orcs? Want to share your Steam I.D. so you can team up with me for some orc-murdering mayhem? Leave a comment below.