The modder “Sigma64” published a new version of its Extreme mod for Wolfenstein 3D. The add on improves the realism and graphics, in addition to introducing new features and secrets.
For example, there are three types of SS guards and new attacks to enemies, but also new weapons and more.

You can download the necessary files by following this link. Remember that in order to perform this mod you will need the source port ECWolf.

Source:DSOG