Level 2
Ogre Citadel

Level 3
Crypt of Decay

Level 4
The Ebon Fortress

Level 5
The Wizard's Manse

Level 6
The Dismal Oubliette

Secret Level
Underearth

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As in most of Quake's opening missions, the only monsters you’ll face in the Installation are grunts, rottweilers, and, new to the registered version, enforcers. The enforcers carry laser guns, a feature with both advantages and drawbacks. One drawback is that they can do more damage than the grunts can do with their measly shotguns, but the flipside is that their backpacks provide valuable cell ammo.

Jump off the opening bridge to find Secret Area 1

There are some hard-to-see steps on this wall in the Gold Key Room

Secret Area 1
Just outside of the opening room, you’ll come to a large pool of water divided by a walkway. Stand in the middle of the walkway, turn left, and notice the section of section of wall which is jutting out in a triangular fashion. Jump into the water and swim under this section, which is actually an overhang. From underwater, look up to see a small opening leading to a red armor. Below this opening is also a small tunnel that contains two boxes of nails.

Secret Area 2
At the far end of the walkway is a room containing the gold key. Grab the key and turn around. An enforcer will have appeared in an elevated niche. Take out the enforcer, then look at the sloped area of the wall to your left. There will be some small steps leading up. Jump up the steps. When you reach the top, walk through the center section of the wall (no need to open any doors, simply step through the wall). In this alcove you will find 100 health.

Run over this elevator into the small room on the other side

This small opening in the cage will give you access to the yellow armor below

Secret Area 3
There is a pool of murky water beneath the niche where the enforcer appeared in the gold key room. Drop into the pool and follow either of the paths around to a small room containing some healthkits, a box of shells, and a teleporter. The teleporter will take you back to the entrance of the gold key room.

Secret Area 4
After going through the silver door, walk around the stack of metal crates and press the yellow button. This will open a doorway on the other side of the stack. (Note the yellow armor in the cage to your left. This armor will be accessible from Secret Area 5.) Walk back to the new opening, where you will see a red arrow pointing to an elevator. Run across the elevator, and continue running as it begins to ascend. You'll end up in a small room on the other side. Turn to your left and hit the wall. A door will open leading to a corridor with a Quad Damage.

This grate at the bottom of the circular pool leads to two secret areas

Secret Area 5
Return to the elevator and ride it up to the next level. When you reach the ramp leading down, look slightly to the right, where you will see an opening in the cage. Jump through this opening onto the boxes, then make your way down to the yellow armor. You will exit through a similar opening next to the elevator.

Secret Areas 6 & 7
You will come to a room filled with enforcers. This room overlooks a huge central pool of murky water. Jump out of the room and into the pool. Swim down to the center of the pool floor until you see a grate. Shoot the grate and a passage will open. Swim down through the passage. When you reach the bottom, turn around until you see another grate. Hitting this grate will open another passage, though it won’t be apparent. Turn around and exit the pool, and you will find a plethora of items - rockets, a grenade launcher, nails, and some health kits. If you hit the grate in the passage as described above, there will also be an open area containing a Pentagram of Protection.

100 health can be found in an enclosed area on the pathway encircling the pool near Secret Area 6.