Originally released as a free mod for Half-Life 2, this version covers the story up until the "Lambda Core" chapter (it does not include the Xen levels). It is still hosted as freeware on platforms like TechSpot . Key Updates in v1.1

Added a toggle for "Classic Iron Sights" and fixed bugs where the game failed to detect certain controllers.

The (released post-launch for the commercial version) focused on refinement and stability:

This is the complete, commercial release available at Steam. It includes the fully reimagined Xen chapters , advanced lighting, and modern stability updates.

A free tool found in the "Tools" section of your Steam Library that provides the engine needed to run the mod.