'link' - Doom 3- Bfg Edition -r.g. Mechanics-

included in the installer. For the R.G. Mechanics version, it generally specifies:

A previously unreleased 8-level campaign that was cut from the original 2004 release. DOOM 3- BFG Edition -R.G. Mechanics-

If you want to look into how this game runs on modern PCs, tell me: What are you currently using? Are you looking to play it in Virtual Reality (VR) ? included in the installer