You are a cleaner, your work is to clean the floors of a left building that are infected of monsters and aliens. You gain money by killing the enemies and later you can buy some Cool Weapons like plasma guns, snipers, grenade launchers, machineguns, etc... This game has a Dinamic Lighting System and Advanced Balistics and collision detection. AWSD or Arrow keys to move. 1-7 to change weapons. Mouse to aim and Shoot.