Your goal is to survive as long as possible. More and more zombies will come levels after levels. Try to shoot the zombies in the head, you will deal more damage. Try to keep your grenades for situations where will be loads of enemies. Dont waste them on one or two zombies. Be sure to pick up ammo and health power-ups. Use "W", "S", "A", "D" KEYS to move around. Use YOUR MOUSE to aim and LEFT CLICK to shoot. Press "R" KEY to reload. Switch weapons using 1-6 KEYS. Use arrow keys to navigate through the menu and press Enter to select your choice. Lets play!