This version is what ended up being released as the final product. The game was then remade, from scratch, by 2K Games and Gearbox. This is assumed to be one of the last builds/versions. More gameplay was also leaked online at this time. 3D Realms was downsized, which resulted in the large majority of the development team being laid off. Then, in 2009, the development took an unexpected turn.

In 2008, several screenshots were bundled as unlockable extras in the XBLA release of Duke Nukem 3D. They announced that the game would be released in 2004, when it was announced that it had been reworked again, this time with the Doom 3 engine. In 2002, the game was reworked yet again with another engine, with most of the original designs being reworked or scrapped. In 2001, another trailer was released, which showed various improvements over Duke Nukem 3D, with the trailer ending with the phrase 'When it's done'. In 1999, they released screenshots that showcased what could be achieved with the Unreal Engine, and shortly after, stated that the game would see a 2000 release. However, 3D Realms made the decision to switch to the Unreal Engine, a process that was to take a month to 6 weeks. The game started off development using the Quake II engine, in 1998.

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