Call of Duty: World at War has officially hit the retail shelves today with also news that we learned of zombie multiplayer. Now this is the question of whether gamers are ready to jump back into World War II once again, however, with impressions of the beta it's looking pretty good for World at War. However, using only the Call of Duty 4 engine, you could say that World at War is more or less Call of Duty 4 in World War II. But, that's for you to decide of course.

“Our goal from Day 1 has been to make sure that Call of Duty: World at War re-defines players’ expectations of World War II first-person action,” said Treyarch studio head Mark Lamia.  “From cooperative gameplay to a multiplayer that combines vehicle and squad combat, along with a host of new weapons, settings and enemies, we’ve left no stone unturned to make this the best experience possible.”

Following the U.S. Marines in the Pacific campaign, Call of Duty: World at War shows a side of World War II never seen previously in the series. Players will experience swamps, beach invasions and tropical undergrowth against as they go head to head with one of the most brutal enemies of the war. The European campaign will feature uncompromising and vicious battles as the Red Army pushes into the heart of Berlin.   

Multiplayer delivers squad-based interaction while expanding on the Party System feature with party privacy and match-making preferences. Combined infantry and vehicle missions add a new dimension to the online warfare. Players unlock a dozen new Perks while participating in epic battles ranging from massive wide open fields in the European theatre to the intimate courtyards of a Japanese castle.

Call of Duty: World at War is rated M for "Mature" and is available for the Xbox 360 ($59.99), Playstation 3 ($59.99) and Windows PC ($49.99) and Nintendo Wii ($49.99)