


The title proved extremely popular, with the full version of the game selling one million copies. The first episode was largely designed by John Romero. The game launched in an episodic format in 1993- with the first episode available as shareware and two more episodes available by mail order. The development of the original Doom started in 1992, when John Carmack developed a new game engine, the Doom engine, while the rest of the id Software team finished the Wolfenstein 3D prequel, Spear of Destiny. These features were added in newer titles. Due to technical limitations, the player could not jump or look up and down in the classic series. Outside of combat mechanics, Doom levels often feature mazes, coloured key cards and hidden areas. With the player carrying all of these weapons at once, the strategy of "gun juggling"-rapidly switching between the weapons depending on circumstance-can be employed. The original game featured a total of eight weapons, designed in such a way that no weapon became obsolete after the acquisition of another. More recent titles, particularly the 2016 series, would feature a heavier focus on narrative.
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The classic series had only a limited focus on the story, much of which was present in the manuals rather than the games themselves.

The games are usually set within sprawling bases on Mars or its moons, while some parts take place in Hell itself. The player battles the forces of Hell, consisting of demons and the undead. The Doom video games consist of first-person shooters in which the player controls an unnamed space marine commonly referred to as Doomguy by fans (in the 2016 series, the protagonist is called the "Doom Slayer" or just "Slayer").
