E1M5: Gloom Keep

Gloom Keep is the fifth level of the Dimension of the Doomed. It is a medium-sized castle surrounded by a moat. The Keep features various architecture, including rooms, corridors, stained glass windows and Elevators, as well as a gauntlet-like area with numerous traps such as Nail Traps, Falling Spikes, and the exclusive Sliding Spikes.

This level introduces the Rocket Launcher, if it was not found in E1M8. It also introduces the Shambler on Easy. In this level, the player must find both a Gold Key and Silver Key in order to proceed.

Quick Level Completion

 * Go through the doorway straight ahead and follow the corridors to a central platform with the Silver Door on the floor below.
 * Take the left corridor and follow it to the Silver Key, then drop through the hole to return to the start of the left corridor.
 * Take the right corridor of the central platform and follow it to a Teleporter.
 * Go through the Teleporter and collect the Gold Key.
 * Turn around and enter the doorway to the left.
 * Follow the corridor to a staircase.
 * Cross the staircase and follow the corridor at the end to the left.
 * Open the Silver Door and press the Button.
 * Turn around and get on the Elevator.
 * At the top, open the Gold Door.
 * Drop through the hole to the exit room.

Walkthrough
Collect the two 25 Health to the right. Drop off the edge and go into the Water. On your right there is a hole that contains an alcove  (#1) . On the left the Water continues to some stairs that lead up to a brick wall to jump over. On the passageway is a Knight. Turn left and collect the Shells at the end of the passageway. Turning back, right leads to where you started, so go left into the building and collect a 25 Health. Continue down the hallway, collect the Shells, kill the Knight, and avoid the 4 Nail Traps. Collect a 25 Health at the end and turn left. Collect the Rockets and Rocket Launcher while killing the  2 Knights. Drop down on one of the sides and kill the Fiend. Collect the two 15 Health on the left side, and the Shells and Nails on the right. The Silver Door is in the middle of this room, and an Elevator that doesn't work is on the opposite side. Thus exit by the passage to the right, and once you make it through the doorway, turn left and kill the Ogre on the ledge above. Go that way and turn right after the stairs on the right to collect the two 25 Health. Turn back towards the way you came in, but go instead to the other side of the wall that separates the beginning of the room from the majority and collect the Rockets. Go up the stairs mentioned before, go into the next hallway, kill the Knight, and collect the Shells. Step back into the previous room and jump on the short wall to the left. Next jump to the separating wall, and then to the platform with the Ogre (#2) . Return to the next hallway and go out the Door at the end of it to return to the stairs by the Water. Return to the Rocket Launcher room.

Take the left route and collect the Shells and two 15 Health before turning the corner to the left. Kill the Ogre, beware of the Falling Spike, and collect the Shells at the end of the hall. Turn left and kill the Knight while bewaring of the 4 Nail Traps, one for each side of the column. On the north side of the column are two 25 Health. On the right side of the column is another passageway with a Scrag to the right and two 25 Health straight ahead. Dodge a Sliding Spike and hit the Floorplate. Drop off one of the sides and kill the Fiend while bewaring of the Nail Trap. To the right of the column with the Nail Trap are Shells. The Teleporter at the opposite end leads back to the platform, where you can dodge the first Sliding Spike, as well as 3 more when you turn the corner. However, you can avoid them completely by going to the passageway opened by the Floorplate on the left. In this narrow passageway are two 25 Health, and an Elevator. You are now on the opposite side of the 3 Sliding Spikes. Kill the Knight running towards you from the next doorway, and collect the Nails and 15 Health. At the top of the staircase through the doorway the Knight came through collect the Rockets. Turn right, collect the 25 Health and Nails, and press the Floorplate to unlock the Door to your left. A Knight will come out of the Door, and behind the Knight is the Silver Key.

Drop through the hole in the floor to return to the left side pathway of the Rocket Launcher room. Take the right side pathway. After you climb the stairs, kill the Knight in the next room, and the Ogre next to a pillar to the right of the room. To the left of the room are three 15 Health. Near the pillar with the Ogre is a Super Nailgun, Nails on the other side, and a 25 Health in a corner. Jump and hit the torch on the pillar to open a Movable Wall by the Nails (#3) . Climb the staircase to the left of the room, then turn right and continue up the stairs while killing the Knight. Collect the Rockets to the left of the Teleporter. Enter the Teleporter from the back side to teleport to the roof of the building you were facing at the beginning of the level  (#4) . Collect the Quad Damage at the other side of the passageway, then return and go into the Teleporter just behind where you teleported in.

Immediately as you teleport in you will grab the Gold Key. The Walls around you will open as you press a Floorplate, revealing a Shambler, a monster that shoots lightning. Collect the two 25 Health in the inner area you teleported to. From the way you were facing when you teleported in, behind the front left pillar are  2 Nails and 15 Health. Behind the front right pillar are Shells and 25 Health. Behind the bottom left pillar are three 25 Health. Behind the bottom right pillar are  2 Nails and a doorway out of the room. In the next hallway are two 25 Health and Shells. This hallway leads back to the separating wall staircase. An Ogre is behind a Movable Wall that opened up to the left in the room at the top of the stairs, as well as a 15 Health. Return to the Silver Door and press the Button inside, activating the Elevator. Collect the Shells and 25 Health at the top by the Gold Door. Drop through the hole past the Gold Door to get to the room with the Rune Gate. Turn around and shoot the indented Movable Wall first however  (#5) .

Differences from Easy to Normal

 * Knight just out of sight around right corner of building at start
 * Knight to right after doorway to building across start
 * Ogre on platform by Gold Door, can shoot to Rocket Launcher platform however
 * 2nd Knight on right passageway from Rocket Launcher room
 * 2nd Fiend by Silver Door
 * Ogre on Rockets side of separating wall room
 * 2nd and 3rd Knight in 4 Nail Trap column room
 * 2nd Scrag by Floorplate in Sliding Spike room
 * 2nd Fiend on lower floor of Sliding Spike room
 * 2nd Knight by doorway after Sliding Spike room
 * Scrag on staircase after Sliding Spike room
 * Ogre by Floorplate to open Door to Silver Key
 * After dropping through hole in floor with Silver Key, a Movable Wall opens up revealing an Ogre and 15 Health
 * Knight on stairs of right passageway from Rocket Launcher room
 * 2nd Ogre in Super Nailgun room
 * 2nd and 3rd Knight by Teleporter leading to  (#4) 
 * Fiend on roof of  (#4) 
 * Scrag spawns when you go for Quad Damage on  (#4) 
 * Knight in hallway between Shambler and separating wall room

Differences from Normal to Hard/Nightmare

 * As you move from the start position, 2 Scrags spawn behind you. The Knight on the right just after the entrance, as well as the Knight just out of sight to the right also tend to run out to attack you as well when this happens.
 * Knight by 4th Nail Trap  in first hallway in walkthrough
 * 2nd Ogre in left passageway from Rocket Launcher room, though it will run out once you grab the Rocket Launcher due to its closeness
 * Knight by Silver Doorwith the 2 Fiends
 * 2 Scrags spawn for  (#2) 
 * Knight on Sliding Spike passageway to Floorplate
 * 3rd Fiend on lower level of Sliding Spike room
 * Knight on top of stairs after Sliding Spike room
 * Ogre to left of entrance to Super Nailgun room
 * Scrag by 3 Knights by Teleporter to  (#4) 
 * A Movable Wallopens up behind you as you walk up the stairs to the Teleporter  to  (#4)  with an Ogre inside
 * A 2nd Scrag spawns when you go for the Quad Damage on  (#4) 
 * A Knight beside the Quad Damage on  (#4) 
 * Ogre  behind you when you grab the Gold Key
 * 3 Fiends spawn when the Shambler dies
 * 2 Ogres by Rune Gate, one on left, one on right

Glitches

 * The player may Grenade Jump or Rocket Jump to  (#1)  from the starting room.
 * The player may Grenade Jump or Rocket Jump to the Rocket Launcher room from the Silver Door room.
 * The player may Grenade Jump or Rocket Jump to the Gold Door from the Rocket Launcher room - this actually skips the Silver Door completely.

Differences

 * No two 15 Health on left passage from Rocket Launcher
 * No Shells to right of Silver Door
 * Grenade Launcher in separating wall room, but no Rockets on opposite side of Silver Door room entrance
 * Nailgun on right side of 4 Nail Trap column room
 * Yellow Armor past first Sliding Spike by Floorplate
 * Shells past the all 4 Sliding Spikes
 * Double-Barrelled Shotgun by Floorplate that opens Door to corridor that used to contain Silver Key
 * No 25 Health by Super Nailgun pillar
 * No Rockets by Teleporter to 4 pillar room
 * Shells and Nails at  (#1) 
 * No 2 Nails by front left pillar of 4 pillar room
 * No 15 Health by front right pillar of 4 pillar room
 * No three 25 Health by bottom left pillar of 4 pillar room
 * No 2 Nails by bottom right pillar of 4 pillar room
 * No two 25 Health in corridor connecting 4 pillar room and separating wall room
 * No 25 Health by Gold Door
 * 15 Health in exit room

Spawn Locations

 * Start
 * Room with  Falling Spike
 * Before  Sliding Spikes in Sliding Spike room
 * Floorplate to  Silver Key
 * Room with Super Nailgun
 * Right passage from Rocket Launcher
 * Interior box of 4 pillar room
 * Separating wall room
 * By  Silver Door