were notorious for requiring CD keys even on digital platforms like Steam.

This term appears associated with specific, often forum-shared, repackaged, or "exclusive" versions of the expansion. These versions are usually modified to automatically insert keys or include trainers. Installing from ISO:

Somewhere else, in a dark corner of the web, a user named StoJBrO logged in and typed a line into a new build: "Update: added guardrails. Don't let them keep more than one." Then they closed the project and went to make coffee, because gifts from ghosts always needed tending.

This item is incompatible with DOOM 3. Please see the instructions page for reasons why this item might not work within DOOM 3. .. Steam Community DOOM 3: Resurrection of Evil - Steam Community

: This is likely a username or tag associated with a specific individual who uploaded this version to torrent sites or "abandonware" forums.

Released in 2005, Resurrection of Evil (ROE) expanded id Software’s darker, horror-focused DOOM 3 by introducing the Grabber (a gravity gun precursor) and the iconic double-barreled shotgun. While DOOM 3 emphasized slow-burn tension, ROE leaned into faster-paced combat, bridging classic DOOM ’s aggression with next-gen lighting and physics.

In RoE, the "gems" refer to the , which gains three powers (Helltime, Berserk, and Invulnerability) by harvesting souls from defeated Hunters. To effectively have "unlimited" use of these powers via cheats: Guide :: Invalid CD-key - easy fix - Steam Community