The 2001 Unreal Engine version of Duke Nukem Forever was 90% complete
Duke Nukem Forever was a huge disappointment for a lot of Duke Nukem fans. However, there was a version that impressed everyone back in 2001. That version of Duke Nukem Forever was powered by Unreal Engine and was meant to be a more serious/dark game. And according to Frederik Schreiber, VP at 3DRealms, that version is 90% complete.
As Frederik Schreiber claimed, this 2001 version packs 14-16 hours of gameplay and it played partly as an RPG in terms of goals. Players basically had Mission Objectives on their HUD and they could activate them, like quests. Furthermore, you also had an inventory with ID badges, keycards, etc.
In Duke Nukem Forever 2001, players meet and save NPCs, solve puzzles, and try and solve the mystery of what’s going on. Then they meet the infected EDF who’s attacking them and the story evolves from there.
Now what’s interesting here is that 3D Realms would like to release this 2001 version of Duke Nukem Forever, however, it appears that this may never happen due to licensing issues. Currently, Gearbox owns the rights of the Duke Nukem IP and in a Twitter exchange with Randy Pitchford back in April 2017, the CEO of Gearbox claimed that they could offer a license to 3D Realms, however, nothing has happened since then.