Unlike Heretic, Hexen, Strife and many modern first-person shooters to date, Doom and Doom II only featured the ability to look around horizontally, or side to side. Free look in FPS games stands for the ability to move the player's view both horizontally and vertically to see not only around the player, but also above and below. Doom originally had an auto-aim feature that directed the player's shots at shootable targets that were above, below, or straight ahead in the player's field of view. When using free look, auto-aim is not needed to shoot at targets that are above or below the player's direct aim, because the player can move the view up and down as needed and pinpoint the target's height manually.
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