This is a first-person shooter in which players assume the role of a secret agent who must battle an invading alien force. Players can target and kill alien invaders as well as human enemies by using a variety of shotguns, machine guns, rifles, and alien weaponry. Realistic gunfire and cries of pain are heard during combat, and a tally of alien headshots is displayed at the end of each stage. While there are no headshot animations for the human enemies, puffs of red blood emit from their bodies when they are shot. Orange substances spurt out of the injured aliens. Some expletives (e.g., "hell" and "damn") can be heard in the dialogue.