As you progress, you'll be able to buy new weapons and upgrades from a local mechanic using items collected throughout the levels and tokens earned by defeating zombies. Each character has unique abilities and can perform special attacks when their power bar is full. You'll also find 16 unique guns made from various parts, with three upgrade levels each.
The game features Unreal Engine 3 and PhysX for realistic physics-based destruction and detailed lighting. The plot moves forward through comic-strip cut scenes, showing new zombie mutations as they appear. The multiplayer modes include a deathmatch for up to four players on the same computer or a 16-player game online or over LAN.