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DOOM 3: Resurrection of Evil Hints
How can I open the keycard-locked door in the big Reactor Core area?
1 of 4: Scout around on the catwalks to see what you can find.
2 of 4: Take the two little lifts down to the bottom of the core area.
3 of 4: Go through the unlocked door down there and climb down a few ladders.
4 of 4: At the bottom is a small room with the keycard for the upper-walkway door.
