Features:
-Cooperative gameplay for up to six players against multiple waves of specimens
-Persistent Perks system, allowing players to convert their in-game achievements into permanent improvements to their character's skills and abilities
-Over 40 Steam Achievements, including "Dignity for the dead" for killing 10 enemies feeding on dead teammates' corpses and "Hot Cross Fun" for finishing off 25 burning enemies with a Crossbow
-Slow-motion "ZEDtime" to better watch those crucial and violent creature deaths, even in multiplayer
Solo game mode for offline play
-Nine different monster types trying to eat your face off, armed with everything from teeth and claws, to chainsaws, chain-guns and rocket-launchers
-12 + Weapons for the players to chose from, ranging from knives and fire-axes to pump shotguns, rifles and a flamethrower
-Equip your team with welders, medical tools and body armor to help your odds of survival
-Choose which Perks to play with to best balance out your co-op team against the horrors
-Open, non-linear play areas: choose when and where to fight - or run; weld doors closed to direct the monster horde down alternate corridors
-Fully-configurable, allowing players to change the difficulty level, number of creature waves, or even set up their own favorite waves of monsters
-Support for Steam Friends and other Steamworks features
-Includes SDK for the creation of new levels and mods



Minimum System Requirements:
System: Windows 2000/XP/Vista
Processor: 1.2 GHZ
Memory: 512 MB
Video Card: 64 MB DirectX 9 compatible video card
Audio card: DirectX 8.1 compatible sound card
Hard disk: 2 GB

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