CheatCodes.com has all the official Doom 3: Resurrection of Evil Expansion Pack PC cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Monday May 20, 2013 for Doom 3: Resurrection of Evil Expansion Pack are shown below.
Use The BFG against the boss, when he goes under the platform you are on, change to the shotgun and kill some lost souls. When he comes back up again change to the chaingun and shoot him while he is moving around making sure that you are not in the fire he sets. When he gets down on the skull, change to the BFG again, and charge a shot up all the way (or as charged as you feel safe to go, then shoot the rest of the cells at him). Reload, and if he is still there shoot single BFG cells at him. When you run out of BFG cells, switch to the rocket launcher instead of the BFG.
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