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Duke Nukem Forever screenshots from 1997
The first image is the first sneak-peek of anything related to Duke Nukem Forever that 3DRealms ever provided. It was hidden inside the webcam tour of their old office and shows a level designer building a level with QuakeEd.
The next screenshot is the first official Duke Nukem Forever screenshot ever released.
The remaining screenshots were sent by 3DRealms to PC Gamer for their article in the November 1997 issue. They all show prototyping work done with the Quake 1 engine before receiving the source code of Quake 2 from id.
The thumbnails with the word "ENHANCED" lead to rescaled versions of official (=not scanned) screenshots, processed with LetsEnhance.