Call of Duty: World at War - Zombies is an iPhone and iPod Touch title that is based on a mini game from the console and PC release, Call of Duty: World at War made by Treyarch.
In the game you play a US soldier who finds himself in an abandoned building in the middle of wasteland. Nazi uniformed zombies start to move in from the mist surrounding the wrecked property and the player must try to stay alive as they batter their way in. Players get points from killing the hordes of undead, these can be spent on buying new weapons and opening new areas of the building.
The gameplay is a classic FPS experience with three different control types: a touch screen/free look; a dual stick (emulating the console experience); and an accelerometer input - a first for FPS's on the iPhone.
Call of Duty: World at War: Zombies has a co-op mode that allows up to four players to play over a wireless network or online (or 2 player with bluetooth). The game shipped with only one map but a downloadable content framework was announced which would allow new maps to be made available in the future.