Quake II/Security Complex

Level objective
The objective for this level is to locate the Red Key and find a way to deactivate the yellow laser barrier.

From this level you can reach the ../Guard House/, ../Torture Chambers/ and ../Grid Control/.

First visit
Proceed south, straight ahead across the open space and enter the open door at the top of the stairs, go down a couple of flights of stairs, turning right, and eliminate the enemies you find there. Pay particular attention to any Medics you may see on the catwalk above, to keep them from reviving the Gunners. You can't reach the catwalk yet; it's only accessible from the Torture Chambers. Go up the stairs at the left side of the room and stay along the east wall on the mezzanine, then enter the passageway in the northwest corner. Follow the passageway to encounter a Gladiator guarding the Red Key in a control room area. Also find a Chaingun there. Return to to the previous room and explore downstairs. You'll find a couple of Quad Damage items and additional items under the stairs. Explore outside to see the Pyramid. You can't enter yet, as you lack the Pyramid Key. Go back up the stairs and return to the Detention Center with the Red Key to complete that area.

Before you return to the Detention Center, you may opt to explore the tunnel down the stairs to the west and the building to the east of the open area. In the tunnel you'll encounter a Tank guarding a control secured with a yellow laser barrier. The Tank can be eliminated by staying at the opposite end of the tunnel, in the right-angle turn, and, while staying under cover, firing blindly with the Blaster. If you do it correctly, the Tank will never see you, so he'll stay at his post and take hits until he collapses. You can explore further along the passage, but you'll find your path blocked by a retracted bridge over a pool of lava. The bridge control is evidently in the alcove behind the laser barrier. Going into the building on the east, you'll encounter several enemies, but eventually your progress will be blocked by a yellow laser barrier across a portal. The only secret in the Security Complex is to be found just to the right of the laser barrier.

Second visit
On the second visit to the Security Complex, the yellow laser barriers should be down, giving you more access. You can now reach the Guard House by entering the door to the east or the Torture Chambers by descending the stairs into a tunnel to the west.

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After you've deactivated the yellow laser barrier and just before you leave the Security Complex to search in the Guard House, you encounter another crashed drop-pod with the body of a marine lying next to it. The pod is inscribed "Willits". Too bad your buddy didn't make it. Collect his Power Shield and Chain Gun and put it to good use.

Secrets
This level has one (1) secret:
 * In the room just before emerging into the open space with the door that leads to the Guard House, shoot the west wall to open a hidden panel and reveal a Grenade Launcher. It is just to the right of the portal secured by the yellow laser barrier.