For the original DOS version, see Duke Nukem 3D.
Add -noanim to the Steam launch options (this disables cutscenes).
-applaunch 225140 /gduke3d_hrp.zip /hhrp.def
-xATGAME.CON -gplugandpray.zip -gDUKE3D.GRP
Although the installation is finished, if you wish, you can install the XXX rated files separately. It is recommended that no screenshots of the textures of these files are to be shown through Steam Community under the penalty of being banned. Copy the file, xxx_pack.zip which is located in <path-to-game>\bin. Paste the file in <path-to-game>\gameroot. In "Set Launch Options", alter the prompt to: -applaunch 225140 /gduke3d_hrp.zip /hhrp.def /gxxx_pack.zip. If that prompt does not work with your OS, try: -xATGAME.CON -gplugandpray.zip -gDUKE3D.GRP -gxxx_pack.zip.
-applaunch 225140 /gduke3d_hrp.zip /hhrp.def /gxxx_pack.zip
-xATGAME.CON -gplugandpray.zip -gDUKE3D.GRP -gxxx_pack.zip