In 2001, at the height of the popularity of Duke Nukem games, the Duke Nukem Endangered Species project was being prepared for release. However, due to a number of issues and the transfer of rights to the series, the game never saw the light of day. But now that the working prototype has appeared on the Internet, it can be downloaded for free.
The game is available here, you just need to download and extract the archive and install the patch. Then the shooter can be launched. The links first appeared on Reddit and then spread across the web.
It should be noted that this is an unfinished version of the game, so you just can’t get to the credits. It is possible that this is the same prototype that the developers handed to the founder of Duke Nukem Wiki in 2010.
Technically, the game is a first-person shooter in which Duke will have to fight not with aliens, but with animals, including huge ones. For a comfortable game in Returnal on a PC, you need 32 GB of RAM – system requirements have appeared on Steam.
Source: VG Times