Elevator Action
After completing a level, the next stage is generated, with exactly the same building, but a randomization of red-door locations. Also, the A.I. gradually become smarter and more sneaky in their tactics (for instance, they may vary between crouching and not crouching when they fire at you), against the sole defense of the player: A semi-automatic pistol that can fire three shots at a time, and kills instantly, much like the one-shot deaths the player may endure.
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