Fight against several waves of terrorists throughout several missions. Each mission takes place in a different location, providing several distinct cover spots for the terrorists to shoot and pop out of in this shoot-em-up. You're armed with an assault rifle, which you can aim and shoot with your mouse and left mouse button. Use the R key to reload. The rules of the game: shoot anything that moves and shoots back at you. Take down your enemies with one or two shots before you run out health. Go back to the level screen and see your scores or replay the level to try to beat your own high score.