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Duke Nukem Forever screenshots from 1998
The first two screenshots were released by 3DRealms shortly before deciding to scrap everything that was done with the Quake 2 engine and restart the development with the Unreal engine.
The other screenshots were sent by 3DRealms to Computer Gaming World and GamePro, at about the same time.
The seventh one is from PC Games.
The last two pictures are photographs showing, respectively, Chris Johnson making a level with QuakeEd, and Ruben Cabrera with a Duke Nukem Forever screenshot as his desktop wallpaper.