Here's a Warhammer 40,000: Space Marine trailer to show off the free co-op 'Exterminatus Mode' trailer which is available now (and free) on PC and PS3, Xbox 360 release is coming soon.

Space Marine's Exterminatus mode pits an elite squad of four Space Marines against hordes of alien enemies in a score based fight to the death. Players can choose the Tactical Marine, Devastator or Assault Marine as well as utilizing any weapons and perks available to those classes.

Each of Exterminatus Mode's scenarios, 'Assault on Hab Center Andreas' and 'Escape From Kalkys Facility,' feature global leader boards challenging players to better their scores by completing dynamic challenges as well as utilizing score modifiers which increase game difficulty in exchange for additional points.

Experience earned while playing this mode counts towards the game's multiplayer ranks, allowing players to earn progression in both Co-Op and multiplayer.

Jim Huntley, Vice President of Global Brand Management commented,

"We are delighted to be able to reward the loyal fans of Space Marine with a new free mode to extend and enhance their game play experience. Exterminatus will provide a rewarding new challenge to players old and new."