A YouTube user has uploaded videos of self-playing demos (attract mode) found in classic "3D action" games like Doom and Duke Nukem 3D (in some cases, for the shareware versions):
Classic FPS Demo Loops
Another user has records of self-running demos from all versions of Doom: link. These are recorded with aspect correction on, in the 4:3 aspect ratio BTW.
Here are the demos from registered Duke Nukem 3D v1.3d, the Atomic Edition v1.5, and LameDuke.
Discuss classic PC games
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