The first map pack for Call of Duty: World at War hits today and includes a new Nazi Zombie Coop level plus tons of new fun features for zombie killing.

The new level, set in an insane asylum, includes Perks-a-Cola soda machines and an electroshock defense systems. The pack also comes with three new multiplayer maps: Nightfire, Knee Deep and Station.

"Nightfire" is all about fighting in a dark urban war-torn Berlin. While you dart in and out of shelled buildings, you've got the fires raging throughout the city as your only source of light.

"Knee Deep" is a Japanese-run command center in the middle of what used to be a quiet Peleliu village. On your way to taking over the command post, you'll be wading through jungle streams and fighting your way through fortified Japanese bunkers. This map works well for larger team games and objective matches.

Finally, "Station" offers a lot of variety, from close-range choke points to sweet hidden spots just waiting to be a home for that devastating sniper. It's a bombed-out underground train station, so you'll find yourself running through destroyed subway cars, hidden passageways, loading platforms and second-story overlooks.