In Operation One you are an operation of one, fighting against the evil terrorists that are holding some hostages in the buildings. You want to shoot the terrorists before they start shooting at you. It's very important that you do NOT shoot the hostages that pop up, screaming their heads off. Use the space bar to reload; you'll want to do this when get a lull in the shooting and not wait for the game to reload automatically. You can shoot ammo and health packs that float from the sky to keep you going. Once you finish, you'll get to go to the next level and shoot even more bad guys in Operation One!