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Duke Nukem Forever screenshots from 2001
The first three images are screenshots were released by Gearbox along with Duke Nukem Forever to show what the game looked like in 2001, when the trailer displaying the first Unreal-based iteration of the game was shown at E3.
The other three images are photographs showing 3DRealms employees editing that trailer.
The following six screenshots were leaked on 4chan in 2018, and come from a recorded playthrough of an October 2001 build of Duke Nukem Forever.
The next five screenshots (the last of which is an animated GIF) were leaked on 4chan in 2019 and come from the same playthrough.
The last group is 4 animated GIFs and 5 screenshots that were leaked in 2021.