Go to the location that isn't open to the public. Remove mutants and tree creatures from the abandoned land cloaked in fog. Locate and eliminate the Lilac Head. Among your weapons are pistols, machine guns, ultrasound, an ax, grenades, shotguns, sniper rifles, and grenade launchers. Defend the planet from a monster invasion. Destroy every single one of them!!!
Instructions: Mouse - look around WASD - movement W + Shift - run Space - jump Left Mouse Button - shoot Right Mouse Button (Hold) - aim Mouse Wheel - Next / Previous Weapon 1-7 - weapon hotkeys R - reload G - throw a grenade