The game is highly addictive and you need some professional skills to clear each level by surviving against well equipped enemies. The best strategy is to shoot them on the spot otherwise they can give you hard time. Also don't forget to keep an eye on the energy status and reload immediately to avoid failure. Good Luck.... and Walk = Left / Right Arrow Keys
and Crouch = Down Arrow Key
and Enter Door = Up Arrow Key
and Run = Left / Right Arrow Keys + S Key
and Shoot = D Key
and Reload = R Key. (Hitman, Killing, Stealth, Shooting, Game)...