Co-op game mode for up to six players obliterating 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
Watch those crucial and violent creature deaths in slomo "ZEDtime", even in multiplayer
Solo game mode for offline play
9 different monster types trying to eat your face off, armed with everything from teeth and claws, through to chainsaws, chainguns and rocket-launchers
12+ weapons for the players to chose from, ranging from knives and fire-axes up to pump shotguns, rifles and a flamethrower
Add in a welder, medical tools and body armor to help the players survive
Players choose which Perks to play with, so they can best balance out a co-op team to survive the horrors
Open, non-linear play areas: choose when and where to fight - or run
Weld doors closed to try and direct the monster horde
Fully-configurable, allowing players to change things as simple as the difficulty level or number of creature waves, or go so far as to 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
