This month's Games for Windows Co-Op Night we go back to one of our favorites. Dawn of War 2 from developer Relic is an Action/RTS that puts players in the role of gritty space marines as they take on three different aliens in an epic battle for survival. The entire campaign is playable in co-op - and we have the perfect night to meet up with friends to do just that.

We'll be playing on May 26th at 8PM Eastern on Games for Windows Live.

Thanks to the fine folks at Relic and THQ we are giving away 13 prize packs, including 3 grand prizes.

What's up for grabs?

10 Prize Packs that include:

* Dawn of War T-Shirt
* Dawn of War Poster

3 Grand Prize Packs that include:

* Dawn of War T-Shirt
* Dawn of War Poster
* 1 Copy of the game Signed by the developers

To enter to win simply leave a comment at Co-Optimus.com or join us for co-op night. We'll announce the winners on May 27th!