Black Mesa: Improved Xen adds an improved world of Xen to Black Mesa.

In the latest version of Black Mesa: Improved Xen, the developer has added dynamic shadows, improved static lighting, sun rays and reflections. The water on Xena was improved, which became more dynamic (almost like in the original Half-Life), and the textures and models of some parts of the surrounding world were changed using photogrammetry.

This version is only compatible with the Steam version of Black Mesa. Later, the developer promised to add compatibility with the 2012 version.