Episode 1 - The Doomed Dimension

• E1M1 - The Slipgate Complex
• E1M2 - Castle of the Damned
• E1M3 - The Necropolis
• E1M4 - The Grisly Grotto
• E1M5 - Gloom Keep
• E1M6 - The Door to Chthon
• E1M7 - The House of Chthon
• E1M8 - Ziggurat Vertigo

Level E1M1 - The Slipgate Complex

1. Forward and to the right of the start is a ledge with flashing lights. Shoot the wall nearest the start on that ledge (the one with the red design on it). There will be a box of shells behind it. Also, the guys at id are nice enough to tell you to shoot this one if you try to use it.
2. Underneath the first bridge you come to is a river. It flows into a cavern. Swim through the cavern. You will find a set of steps containing a 100% health item and a door to the end of the level (note the door can only be opened if you've already visited the end-of-level area). At the far end of the cavern is a lift taking you back up to the blue armour at the start. Another way of getting this secret is to go to the very end of the level and stand at the top of the ramp, facing the slipgate. Now shoot the wall to your right.
3. Past the first bridge is a door. Enter the door and kill the monsters. To the right of the entrance is a column and a ledge. Stand beneath the ledge on the far side of the column and look up at the column. You should see a globe rotating: shoot it to be lifted up onto the ledge. Turn to your right and there is another globe. Shoot it. It opens, revealing a quad damage item. Another way of getting this item is to go to the top of the slope with the switches (see #5 below). In the corridor leading to the slope you will notice that a wall panel on the right has a different texture: shoot it. Although there are two ways to the quad damage item, you will only see one corridor to the item itself unless you have already found (but not necessarily opened) the other entrance.
4. To the left of the door past the bridge is a large hall. Follow it to the right. There is a large, shallow pool of slime and a button on the wall. Push the button and a platform will slide out from the wall. Halfway across the platform, turn to your left. There will be a red target in a depression slightly above your the level of your head. Shoot it and turn to your left. A door in a wall will open, revealing a double barreled shotgun.
5. On the third switch on the slope, look up and to your left. You should see a hole in the wall (and a bad guy if on hard+ skill level). Jump on to the edge of the slope, on to the light, then on to the switch. In front of you, you should be able to see some steps, jump for the lowest one (this can be a tough jump: save game first!). Follow them up and in the room is a health pack.
6. Go all the way down the walkway. There will be a door. To the right and behind a column will be a biosuit. Take it. You can't dawdle now, as the biosuit doesn't give you much more time than you need. Jump into the slime. Swim underneath the door. Follow the tunnel to where it opens into a slightly larger area. Swim up. There should be a platform with yellow armour and some health on it. The slipgate goes to the area over the door past the bridge (back around secret #3).

Level E1M2 - Castle of the Damned

1. In the room with the yellow armour (and the switch you have to shoot to release the armour) fall into the slime directly in front of the switch. A door will open under the switch, leading to a room with 25 health, a box of nails, and a slipgate to the ledge with the blue armour (back in the room with the BIG red symbol). You're now in the right place to go for secret #2 below.
2. In the room with the BIG red symbol, fall into the slime. In the wall directly opposite the red symbol (and underneath the central walkway) you will find a small submerged room. A ramp in the far left corner leads to a room with shotgun shells and some health. The exit is up the stairs to your left.
3. From the start, cross over the centre bridge, turn right, go through the door. Go straight up the stairs. Behind the centre column on your right, a brick is sticking out. Fix that. Turn right and see the door open, revealing a Quad Damage item.

Level E1M3 - The Necropolis

1. Take the stairs down. When you come to the bridge, fall off to one side. But first<g> kill the zombies. There is a secret room down here: shoot the back wall of one of the alcoves.
2. In the slime lake with the gold key, one area of the wall is slightly different from the rest: the lake is deeper at this point, allowing you to swim under the wall and up to a small room containing a Ring of the Shadows.
3. Kill the two monsters above you on the platforms to get rid of the bars blocking access to the yellow armour. Get the armour and shoot the back wall. The slipgate leads to the platforms the monsters were on.

Level E1M4 - The Grisly Grotto

1. At the very beginning, shoot the red switches on either side of the room. Not very secret for a secret if you ask me, but anyway.....
2. Let's say you're standing on the bank of the lake with the blue key in front of you on the bridge in the middle of the lake. Walk into the water. Turn right. See the hole in the wall across the lake. Well, somewhere between you and that hole is a small square hole. Go in it.
3. Eventually you'll come to a room with five floor switches. After stepping on all the switches, two holes will open up on either side of the room. Pick one, drop down. Press the switch on the wall. Go back up and drop down the other hole. Again, press the switch on the wall. It tells you that a cave has opened up. Go back to the lake the way you got here. Swim out to the open water and turn right. Follow the outside wall. The cave is huge, you can't miss it. Inside the cave is a secret exit to a great low-gravity level called "Ziggurat Vertigo" (E1M8).

Level E1M5 - Gloom Keep

1. At the very beginning, turn to your right, and jump in the water. Forward a little on the outside wall to your right is a small cave. Go in there.
2. Where you come out of the water is a door, take that door. Jump on the wall adjoining the stairs. Then jump over to the tall skinny wall. Now you can get on top of the brick structure where the chainsaw guy was hassling you.
3. Eventually you'll came to a dark room that is open on one side. There is a lit up column in the centre. On the side of the column facing out there is a flame on the wall. Walk up to the column and jump up to hit the flame holder with your head. Now look behind the column. You'll find a room with yellow armour.
4. There is a teleport gate that is set away from the wall enough for you to walk behind it. Enter the gate from the back side. This teleports you to a ledge containing a Quad Damage item.
5. When you fall down the passage to the exit slipgate, turn around. There is a section of wall with a skewed texture. Shoot it. This reveals a slipgate back to the gold key doors.

Level E1M6 - The Door to Chthon

1. When you first start this level you'll step on a floor plate in the main room that opens a door down a hallway in the distance. When you go that way, you'll come to a room with two yellow lights on the floor in the corners. Stop. Look up. Shoot the red switch on the wall above. This opens a door in front of you. Go up the elevator. At the top count the lights in the floor. Stop at the third one and turn around. Look down. See the ledge below. Jump on it for a Quad Damage powerup.
2. You'll come to a spiked wall that comes towards you down the hallway. Get behind it and enter the gate there.
3. Eventually you'll drop into a room with a short set of steps leading to a door. Facing that door, on your left is a door on the other side of some water. To your right, a pillar. Behind the pillar is a room with a switch. When you hit that switch, the pillar will now have a red switch on it. Shoot the switch. That lowers the stairs there, revealing a secret room. Go into that room and wait.
4. When the stairs rise. Another secret room is revealed, with a slipgate in it.

Level E1M7 - The House of Chthon

• To kill the boss:
  Although not an "official" secret, the way to kill the boss may not be obvious. Don't bother shooting him: he's impervious to ordinary weapons. Go round the outside of the lava till you come to the health pack, and a lift. Go up the lift, and walk forwards onto the pressure pad - you'll see electricity above you. Walk round the left hand side till you reach a pressure pad, you'll see one of the conductors lowering. Do the same on the right-hand side and then press the one in the middle to electrocute him! How many times you need to do it depends on the skill level - 1 for easy, 2 for normal, etc.
• Looking at the end-of-game entrance (Shub-Niggurath's Pit)
  More of a cheat than a secret, but here goes anyway.
  Having disposed of the boss, type IMPULSE 11 three times to give yourself the remaining 3 runes (you'll need to exit the console after each IMPULSE 11 otherwise you'll only get one rune). If playing the shareware version, type REGISTERED 1 at the console as well. Having done that, walk through the end-of-level slipgate. After a couple of messages have scrolled across the screen (one of which reveals that Shub-Niggurath is female, for what it's worth) you'll find yourself back in the level selection room. Note that the floor has now opened up to reveal the steps leading to the end-of-game entrance (Shub-Niggurath's Pit). If you haven't actually got the full game yet, falling into the pit itself will cause the game to hang.

Level E1M8 - Ziggurat Vertigo

1. In front of the pyramid is a Pentagram of Protection. Get it. WALK into the lava and drop down. It's very hard to see down here, but it's down here. Move forward some and turn towards the ouside wall away from the pyramid above. Swim up and you're there.
2. Behind the silver key door, there is a passage forward and to the left and one to the right. Take the one on the left. Follow it to the end. On your right should be a wall with a dark border on one section. Shoot that section. A door in the wall will open, leading to two boxes of nails.

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