+ CLASSIC DOOM / UDOOM DEMOS +

Last update: 05/27/2019

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                     DEMOS FOR PC DOOM 1/ULTIMATE DOOM V1.9
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(Read about These demos / Using .lmp files / Upgrading to v1.9)

Click to jump to Doom 1/Ultimate Doom demo(s) for:

EPISODE 1: KNEE-DEEP IN THE DEAD
LEVEL E1M1: HANGAR (2 demos)
LEVEL E1M2: NUCLEAR PLANT (2 demos)
LEVEL E1M3: TOXIN REFINERY
LEVEL E1M4: COMMAND CONTROL (3 demos)
LEVEL E1M5: PHOBOS LAB
LEVEL E1M6: CENTRAL PROCESSING (2 demos)
LEVEL E1M7: COMPUTER STATION (3 demos)
LEVEL E1M8: PHOBOS ANOMALY (3 demos)
LEVEL E1M9: MILITARY BASE (2 demos)
EPISODE 1 SECRET EXIT/SECRET LEVEL
---
EPISODE 2: THE SHORES OF HELL
LEVEL E2M1: DEIMOS ANOMALY
LEVEL E2M2: CONTAINMENT AREA
LEVEL E2M3: REFINERY (2 demos)
LEVEL E2M4: DEIMOS LAB (4 demos)
LEVEL E2M6: HALLS OF THE DAMNED
LEVEL E2M8: TOWER OF BABEL (2 demos)
LEVEL E2M9: FORTRESS OF MYSTERY
EPISODE 2 SECRET EXIT/SECRET LEVEL
---
EPISODE 3: INFERNO
LEVEL E3M2: SLOUGH OF DESPAIR
LEVEL E3M4: HOUSE OF PAIN
LEVEL E3M5: UNHOLY CATHEDRAL (3 demos)
LEVEL E3M6: MT. EREBUS (4 demos)
LEVEL E3M7: GATE TO LIMBO (LIMBO) (2 demos)
LEVEL E3M8: DIS
LEVEL E3M9: WARRENS (2 demos)
EPISODE 3 SECRET EXIT/SECRET LEVEL
---
EPISODE 4: THY FLESH CONSUMED (Ultimate Doom only)
LEVEL E4M1: HELL BENEATH (3 demos)
LEVEL E4M2: PERFECT HATRED (3 demos)
LEVEL E4M3: SEVER THE WICKED (2 demos)
LEVEL E4M4: UNRULY EVIL (3 demos)
LEVEL E4M6: AGAINST THEE WICKEDLY (2 demos)
LEVEL E4M7: AND HELL FOLLOWED
EPISODE 4 SECRET EXIT/SECRET LEVEL

LEVEL E1M1: HANGAR (2 demos)
------------------
E1M1SEC.LMP: 00:32, Skill 4, no monsters
Notes: Shows how to access all "official" Secrets.
Only the score-affecting sections of the map are visited here; any other hidden
areas are not shown.
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Download This demo (E1M1SEC.LMP) / All Doom 1 demos (LEDLMPS1.ZIP)
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E1M1SWCH.LMP: 00:08, Skill 4, no monsters
Notes: Shows the one extra "unofficial" secret that was added to this map when
Doom 1 was absorbed into Ultimate Doom.  (A switch was added to a column in the
room just west of the map's entry point.  That switch opens a wall section to
the east of the entry point.)
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LEVEL E1M2: NUCLEAR PLANT (2 demos)
-------------------------
E1M2SAW.LMP: 00:43, Skill 4, no monsters
Notes: Shows how to access the chain saw.
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E1M2SEC.LMP: 01:13, Skill 4, no monsters
Notes: Shows how to access all "official" Secrets.
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Download This demo (E1M2SEC.LMP) / All Doom 1 demos (LEDLMPS1.ZIP)
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LEVEL E1M3: TOXIN REFINERY
--------------------------
E1M3SEC.LMP: 01:25, Skill 4, no monsters
Notes: Shows how to access all "official" (score-affecting) Secrets, and both
keys on this level.
Note that the yellow key isn't actually used in this demo, and is not needed to
reach an exit or to get a 100% Secrets-found score.  The key allows access to
an area in the southeast that holds some useful Items.  (Use the secret panel
seen at about 1:18 in this demo, and follow the path up the stairs.)
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LEVEL E1M4: COMMAND CONTROL (3 demos)
---------------------------
E1M4EXIT.LMP: 00:24, Skill 4, no monsters
Notes: Shows how to acquire both keys and access the exit.
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E1M4TRIK.LMP: 00:17, Skill 4, no monsters
Notes: Demonstrates a "trick" for accessing the exit in seconds, bypassing most
of the level.
This is accomplished by jumping onto a very narrow ledge that is recessed into
the walls of a rectangular slime pit, and leads around to the room where the
yellow key sits.  From there it's a short run to the exit.
The best way to jump over to the ledge is to use a simultaneous combination of
Run-forward plus Strafe-sideways.  This "strafe running" maneuver will move the
player at an odd angle, but yields a bit more speed than normal running.
During actual play it's easy to miss the jump and fall to the slime below... If
your health is low, you may want to save your game before attempting the jump.
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E1M4TRK2.LMP: 00:43, Skill 5
Notes: Similar to E1M4TRIK.LMP, above, but in Nightmare mode, with monsters.
Notes on the making of this demo: This time I take a more roundabout path, and
pick up some extra weapons and armor.
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LEVEL E1M5: PHOBOS LAB
----------------------
E1M5SEC.LMP: 01:28, Skill 4, no monsters
Notes: Shows how to access all "official" Secrets.
Other, "unofficial" secrets are not shown.  (Specifically: In the room where
the star-shaped teleporter is found, another wall panel can be opened to
provide passage to the square courtyard; And, in the middle of the dark room
just outside of the exit chamber is a curving barrier, and its center section
can be opened up like a door.  Also, a player can ride up on the twin columns
that drop down into the small acid pool near the radiation suit.  When the
columns rise high enough, you can jump across to platforms that hold a couple
of useful items.)
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Download This demo (E1M5SEC.LMP) / All Doom 1 demos (LEDLMPS1.ZIP)
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LEVEL E1M6: CENTRAL PROCESSING (2 demos)
------------------------------
E1M6KEYS.LMP: 01:11, Skill 4, no monsters
Notes: Shows one path for acquiring all 3 keys.
Notes on the making of this demo: When you step into the room where the red key
is found, the entrance will close behind you and remain shut for 30 seconds.
This makes for a long delay in the demo as I wait for it to open again.
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E1M6ALT.LMP: 00:58, Skill 4, no monsters
Notes: Similar to E1M6KEYS.LMP, above, but shows an alternate path to the
yellow key.
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LEVEL E1M7: COMPUTER STATION (3 demos)
----------------------------
E1M7SOUL.LMP: 00:32, Skill 4, no monsters
Notes: Shows how to acquire the "Supercharge"/Soul Sphere in the green slime.
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E1M7ALL.LMP: 02:46, Skill 4, no monsters
Notes: Shows one path that can be used to access all keys, all "official" Items
and Secret areas, and the exit.
Note that this demo focuses mainly on the score-affecting areas or objects; Any
other hidden places and/or useful items are generally bypassed here.
The score-affecting items on E1M7 are Health Bonuses, Armor Bonuses, a Computer
Area Map, a Soul Sphere and a Blur Artifact.
A commonly missed Armor Bonus (helmet) can be seen here at about the 1:10 mark.
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E1M7SAW.LMP: 00:54, Skill 4, no monsters
Notes: Shows how to access a hidden chain saw on this level.
It can be easy to overlook this weapon since it's well hidden, won't affect the
player's Items score (which is true for all weapons), and its location is not a
score-affecting Secret area.
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LEVEL E1M8: PHOBOS ANOMALY (3 demos)
--------------------------
E1M8WIN1.LMP: 01:29, Skill 4
Notes: Shows common techniques for beating this level at Ultra-Violence skill.
(For more information on techniques for beating this level, click here.)
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E1M8WIN2.LMP: 01:38, Skill 2, fists only
Notes: Demonstrates that, with some luck and a lot of dodging practice, you can
beat the bigger enemies without using a single round of ammunition, and without
taking any damage yourself.
(For more information on techniques for beating this level, click here.)
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E1M8BACK.LMP: 01:40, Skill 1
Notes: Shows 3 methods for getting back to the rest of the level after beating
the monsters.
The first method demonstrated here involves catching a ride on the descending
walls of the pentagram.
The second method is a jump from the floor of the pentagram to the floor of the
hallway that led up to it.  This is not a simple jump and so is not recommended
as a first choice.
The third method is to activate a hidden switch that causes an elevator between
the pentagram and hallway to drop down.  You can get on the elevator before it
rises again, and step off when it gets part way up.
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LEVEL E1M9: MILITARY BASE (2 demos)
-------------------------
E1M9ALL.LMP: 01:16, Skill 4, no monsters
Notes: Shows one path for accessing all the keys, all score-affecting Items and
Secrets, and the exit.  (For an alternative method of reaching the exit switch,
see the demo E1M9JUMP, below.)
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E1M9JUMP.LMP: 00:22, Deathmatch, Skill 4, no monsters
Notes: Shows that it's possible (though not always easy) to jump across the gap
that seems to block access to the exit switch on this level.  This can allow a
player to skip past a few monsters and a damaging floor.
In this demo the gap is crossed using two methods: First via standard Running,
which is not recommended, since it's quite easy to fall short and drop into the
corrosive below.
The gap is then crossed by Strafe-Running, using a simultaneous combination of
Run-forward and Strafe-sideways.  This technique moves the player character at
an odd angle, but at a slightly faster running speed.
Notes on the making of this demo: I played in single-player Deathmatch mode to
allow me to start the game with all the keys.
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EPISODE 1 SECRET EXIT/SECRET LEVEL
----------------------------------
D1SECX1.LMP: 00:48, Skill 4, no monsters
Notes: Reveals where and how to access the exit which leads to the secret level
in Episode 1.
(While the demo is running you can press the Tab key to see the current level's
number and name on the Automap screen.)
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Download This demo (D1SECX1.LMP) / All Doom 1 demos (LEDLMPS1.ZIP)
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LEVEL E2M1: DEIMOS ANOMALY
--------------------------
E2M1ALL.LMP: 01:24, Skill 4, no monsters
Notes: Shows how to access all keys, "official" Items and Secrets.  In actual
games, two of the secret areas contain monsters in addition to useful items.
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LEVEL E2M2: CONTAINMENT AREA
----------------------------
E2M2TRIK.LMP: 00:17, Skill 4
Notes: Demonstrates a "trick" for accessing the exit in seconds, bypassing most
of the level.
This works by activating a switch from one of its edges; an esoteric technique
that's used by some Doom veterans.
Here I try to provide a brief glimpse of the switch before activating it.
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LEVEL E2M3: REFINERY (2 demos)
--------------------
E2M3SUIT.LMP: 00:18, Deathmatch, Skill 4, no monsters
Notes: Shows where to find a semi-hidden Radiation Suit in the northeast corner
of the map, where two rooms are connected by a short tunnel, and all the floors
are corrosive.
Notes on the making of this demo: I played in single-player Deathmatch mode to
allow me to start the game with all the keys, and near the blue-keyed door.
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E2M3SEC.LMP: 00:53, Skill 4, no monsters
Notes: Shows how to access all score-affecting Secret areas.
The first Secret shown (at about the :07 mark) is at one end of a small chamber
on the south side of the level, where a backpack can be found.  Note that in
some early console ports, such as Doom for the original PlayStation, a BFG 9000
is also located inside that chamber.
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LEVEL E2M4: DEIMOS LAB (3 demos)
----------------------
E2M4EXIT.LMP: 00:51, Skill 4, no monsters
Notes: Shows how to access the exit.
Also shows the activation of a bridge that leads to a "Supercharge"/Soul Sphere
located across from the exit.
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E2M4ALL.LMP: 03:47, Skill 4, no monsters
Notes: Shows one path used to access all "official" Items and Secret areas.
Also shows how to access the exit.
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E2M4TRAP.LMP: 00:23, Deathmatch, Skill 4, no monsters
Notes: Shows how a player could become inadvertently trapped by activating the
yellow-keyed door from the east.
If this door is initially opened from the west side, it can remain open on its
own indefinitely.  However it can also be opened or closed (with or without a
key) from the east.
If that happens, the door will not remain open on its own, and closes after a
short delay.  Once closed again, it can no longer be opened from the west side.
Notes on the making of this demo: I played in single-player Deathmatch mode to
allow me to start the game around the corner from the yellow-keyed door.
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E2M4STUK.LMP: 00:33, Deathmatch, Skill 3, no monsters
Notes: Shows how a player can be trapped or killed by a hidden crusher in the
northeast corner of the map.
This crusher is in the form of a rectangular block that is partly recessed into
the floor at the north end of a small chamber.  When a player steps across a
nearby floor trigger (or "tripwire") the block rises up to form a barrier that
seals off the chamber in that direction.
Once activated, the block will rise at a medium speed, providing a moment for
the player to move off.  Remaining upon the block can kill a player with
low-enough health/armor, or can permanently trap a player who survives the
crushing action.
Notes on the making of this demo: I played in single-player Deathmatch mode to
allow me to start the game with the keys already in my possession.
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LEVEL E2M6: HALLS OF THE DAMNED
-------------------------------
E2M6RED.LMP: 00:35, Skill 4, no monsters
Notes: Shows how to access the red key.
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LEVEL E2M8: TOWER OF BABEL (2 demos)
--------------------------
E2M8WIN1.LMP: 00:53, Skill 4
Notes: Shows a common technique for beating this level at Ultra-Violence skill.
An alternate method is shown below.
(For more information on techniques for beating this level, click here.)
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E2M8WIN2.LMP: 02:09, Skill 4
Notes: Shows an alternate technique for beating this level.  (A more common way
is demonstrated above.)
(For more information on techniques for beating this level, click here.)
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FORTRESS OF MYSTERY
-------------------
E2M9WIN.LMP: 01:23, Skill 4
Notes: Ultra-Violence combat demo with maximum Kills, Items and Secrets.
Notes on the making of this demo: Here I take some time to get the monsters to
fight among themselves.  It saves ammo, and helps distract their attention away
from the player.
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EPISODE 2 SECRET EXIT/SECRET LEVEL
----------------------------------
D1SECX2.LMP: 00:30, Skill 4, no monsters
Notes: Reveals where and how to access the exit which leads to the secret level
in Episode 2.
(While the demo is running you can press the Tab key to see the current level's
number and name on the Automap screen.)
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LEVEL E3M2: SLOUGH OF DESPAIR
-----------------------------
E3M2TRAP.LMP: 00:14, Skill 4, no monsters
Notes: Demonstrates how a player can inadvertently become trapped in one of the
curving tunnels on this level.
This tunnel's only opening is to the south, and part way up the tunnel is a
floor trigger (or "tripwire") which causes a wall to drop down at the opening,
sealing it shut.
At the north end of the tunnel is a switch that is normally used to raise that
wall after it has dropped all the way to the ground.  That switch can only be
activated once, but can be activated at any time.
A problem here is that the switch will only affect the wall if the wall has
reached the ground.  If the one-time switch is used before the wall touches the
ground, then the wall cannot be raised.
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LEVEL E3M4: HOUSE OF PAIN
-------------------------
E3M4SWCH.LMP: 00:42, Skill 4, no monsters
Notes: Demonstrates the function of the 3 switches near the pair of crushing
"pestles", and how to open the doors in the northeast quadrant of the map.
The trick to the twin crushers: Avoid walking close to them before you get to
the switches.  Walk to the switches along a straight path that runs between
those barrels near the crushers; Or, hug the wall as you walk along the outer
edge of the room to get to the switches.
And the switch-cluster columns in the northeast quadrant: The switches on the
south face of each column will open the nearby (southern-most) doors; and the
west-face switches open the far/northern doors.  (Each remaining switch closes
one of the doors if it's currently open.)
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LEVEL E3M5: UNHOLY CATHEDRAL (3 demos)
----------------------------
E3M5KEYS.LMP: 00:39, Skill 4, no monsters
Notes: Shows how to access the yellow key and blue key.
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E3M5YSEC.LMP: 00:12, Skill 4, no monsters
Notes: Shows where to find a hidden door that is unlocked with the yellow key.
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E3M5BOXS.LMP: 00:59, Skill 4, no monsters
Notes: Shows how to open the four structures ("boxes") that surround a teleport
pad in the center of the level's main courtyard.
In this demo the northern-most box is opened first, then the rest are opened in
clockwise order.
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LEVEL E3M6: MT. EREBUS (4 demos)
----------------------
E3M6BLUE.LMP: 00:26, Skill 4, no monsters
Notes: Shows how to access the blue key when playing at Skill level 3, 4 or 5.
(At Skill 1 or 2, it's located in front of the door of the large, rectangular,
diagonally-oriented building in the middle of the map.)
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E3M6SAW.LMP: 00:17, Skill 4, no monsters
Notes: Shows how to reach the chain saw on the tall pillar.
The trick is to jump (run) to the saw before jumping into the box next to it,
with the teleporter inside.  (If you jump into that box first, the pillar that
is holding the saw will rise up, putting the weapon permanently out of reach.)
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E3M6EXIT.LMP: 00:14, Deathmatch, Skill 4, no monsters
Notes: Shows where to find the exit (requiring a blue key to open) on this map.
Notes on the making of this demo: I played in single-player Deathmatch mode to
allow me to start the game with the blue key already in my possession.
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E3M6BOX.LMP: 00:15, Skill 4, no monsters
Notes: Shows one method for gaining access to the large blue box at the north
end of the map.
This method involves "strafe running": using a simultaneous combination of
Run-forward and Strafe-sideways.  This yields a speed that's slightly faster
than plain running, but moves the player at an odd angle.
With strafe-running you can jump into the blue box directly from the nearby
building.
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LEVEL E3M7: GATE TO LIMBO (LIMBO) (2 demos)
---------------------------------
E3M7ALL.LMP: 01:30, Skill 4, no monsters
Notes: Shows one path for navigating all those annoying teleporter booths to
access all 3 keys and get to the exit.
An alternate, somewhat faster route is demonstrated below.
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E3M7ALT.LMP: 01:12, Skill 4, no monsters
Notes: Like E3M7ALL.LMP, above; but this demo shows that you can use "strafe
running" (using a simultaneous combination of Run-forward plus Strafe-sideways)
to cross some gaps, instead of using bridges.  This can allow you to bypass the
teleporter booths that lead to the switches that activate the bridges, and thus
get through the level a bit faster.
Notes on the making of this demo: From the ledge where I acquire the yellow
key, you can also jump north/northwest to get to the plasma rifle and another
teleporter pad.
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LEVEL E3M8: DIS
---------------
E3M8WIN.LMP: 01:53, Skill 4
Notes: Shows common techniques for beating this level at Ultra-Violence skill.
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LEVEL E3M9: WARRENS (2 demos)
-------------------
E3M9EXIT.LMP: 00:56, Skill 4, no monsters
Notes: Shows how to acquire both keys and access the exit.
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E3M9STUK.LMP: 00:49, Skill 4, no monsters
Notes: Shows two areas on the level where certain actions may cause a player to
become inadvertently trapped and unable to reach the exit.
The first area is at the first door near the player's starting point... It is
possible to start the door closing from its outer/south side, then step north
inside the building before it completely closes.  A player on the north side of
that closed door will be unable to open it, making the exit inaccessible.
The second area is at the blue-keyed door on the west side of the level.  This
door can be opened at any time from its south side, but requires a blue key to
be opened from its north side.  Once opened from the north it will remain open,
unless it is activated again from its south side.  If this happens, the door
will close after a short delay, and a player on the north side of that closed
door cannot open it again, halting progress toward the exit.
In PC Doom games a "walk through walls" cheat code can be temporarily activated
to bypass unresponsive doors.  For more information, see the DoomCode document.
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EPISODE 3 SECRET EXIT/SECRET LEVEL
----------------------------------
D1SECX3.LMP: 00:35, Skill 4, no monsters
Notes: Reveals where and how to access the exit which leads to the secret level
in Episode 3.
(While the demo is running you can press the Tab key to see the current level's
number and name on the Automap screen.)
Notes on the making of this demo: Three different methods for accessing the
secret exit are demonstrated here.
The first method involves an Invulnerability Artifact and a rocket launcher.
(This was the "official" method to access the exit before the speed benefits of
"strafe running" became widely known.)  Note that on Skill levels 2 through 5,
the rocket's explosion alone will be enough; but on Skill level 1, you'll also
need to run backwards while the rocket is detonating.
The second method involves using a simultaneous combination of Run-forward plus
Strafe-sideways.  This "strafe running" maneuver yields a speed that's slightly
faster than plain running, but moves the player at an odd angle.
The third method (or "trick") here involves activating a switch from one of its
edges; an esoteric technique used by some Doom veterans.
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LEVEL E4M1: HELL BENEATH (3 demos)
------------------------
E4M1ALL.LMP: 00:49, Skill 4, no monsters
Notes: Shows how to access both of the "official" Secret areas, and one other
hidden doorway in the southwest corner of the map.  Also shows how to achieve a
100% Items score.
On the east side of the map is a room where one of the two "official" Secrets
is located.  The actual "secret" area here is the top of a large rectangular
block, which sinks into the floor to reveal a "NIN" logo.
The easiest way to get credit for discovering that Secret is to step across the
block before it sinks all the way into the floor; Otherwise, the raised "NIN"
letters that remain will tend to get in the way, making it difficult to touch
the top of the block... and if you don't make contact (the player character's
vertical axis must touch down on the surface), you don't get credit.
(If that block has already lowered, then try stepping down onto the triangular
floor spaces within the raised "N" characters of the design.)
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E4M1WIN.LMP: 04:07, Skill 4
Notes: Shows a sample 100%-Kills victory at Ultra-Violence Skill.
Although it's not easy to do, it is possible to get through this level without
a scratch, and leave with health, armor, and ammo to spare.
Some useful tactics: 1) Let the Shotgun Guys teleport out into the open areas
before killing them, so that you can pick up their weapons; 2) Let monsters
fight against each other when possible; 3) When you pick up the blue key, or
when you Activate the torch-switch (to reveal the "NIN" design), Run out of the
room to avoid being trapped in there; 4) To get maximum yield from the rockets,
fire them at clusters of monsters instead of individuals.  This is especially
important when using rockets against multiple Barons; 5) To get credit for
finding the "NIN" secret, step across the top of the block that surrounds the
design before it sinks all the way into the floor; Or, if that block is already
lowered, then try stepping down onto the triangular floor spaces within the "N"
characters of the design.
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E4M1SWCH.LMP: 00:15, Deathmatch, Skill 4, no monsters
Notes: Illustrates the function of a switch located a few paces south of the
red-keyed door.  (This switch is an exterior counterpart to another switch,
located along one interior wall of a box-like barrier.)
Notes on the making of this demo: I played in single-player Deathmatch mode to
allow me to start the game with the red key already in my possession.
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LEVEL E4M2: PERFECT HATRED (3 demos)
--------------------------
E4M2KEYS.LMP: 00:40, Skill 4, no monsters
Notes: Shows how to access both of the keys on this map.
Notes on the making of this demo: I step into the small triangular area of lava
(just to the south and below the yellow-key area, near the switch that's under
the raised doorway) to open the stairway that leads north out of the room.
You can get to the yellow key by raising the walkway that runs along the
perimeter of the room.  If you move fast enough, you can get on the walkway
just after activating the switch.  (If you don't to get to the rising walkway
in time, you can run up the stairs to the north, and head for the teleporter
there, which sends you back to the level's starting point.)
Note that once the walkway is in place, it's possible to run and jump to the
yellow-key area from the eastern part of the walkway.  (To open the yellow-key
chamber, you'll still need to step across the floor trigger, which is near the
left-hand torch.)
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E4M2ROOM.LMP: 00:13, Skill 4, no monsters
Notes: Shows how to access the small, irregular room that can be seen through
an elevated window in the northwest corner of the map.  This room contains some
useful items.
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E4M2TRIK.LMP: 00:17, Skill 4, no monsters
Notes: Demonstrates a "trick" that can be used to bypass the blue-keyed barrier
column, allowing a player to exit the level without picking up any keys.
This involves "strafe running": using a simultaneous combination of Run-forward
plus Strafe-sideways, which yields a speed that's slightly faster than plain
running, but moves the player at an odd angle.
With strafe-running you can jump past the blue column to the stairway beyond.
During actual play it's easy to miss the jump and fall to the lava below.  It's
recommended that you save your game first before attempting the jump.
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LEVEL E4M3: SEVER THE WICKED (2 demos)
----------------------------
E4M3SEC.LMP: 00:24, Skill 4, no monsters
Notes: Shows how to find all accessible "official" Secrets.
On this map there are 22 places flagged as Secret areas, and almost all of them
are simply arrayed along the steps of a single hidden stairway.
Near that stairway are two small triangles of floorspace that are flagged as
Secret, and are also occupied by torches.  Unfortunately the torches prevent
the player from stepping into the spaces they occupy.  As such, a SECRET score
below 100% is normal for this level.
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E4M3SWCH.LMP: 00:23, Skill 4, no monsters
Notes: Demonstrates the purpose of a seemingly-nonfunctional switch, located on
the south wall of a small octagonal room in the southwest corner of the map.
Near that switch, between the 2 torches on the east side of the room, is a
rectangular block that can be raised up out of the floor, almost to ceiling
height.  This block acts as a crushing floor, and as a barrier that separates
the octagonal room from most of the rest of the level.
To raise the barrier-block, a player must stand on top, within its perimeter,
and then Activate the interior side of its western edge like a switch.  (This
can be done in the airspace above the west edge of the block.)
Once activated, the block will rise at a medium speed, providing a moment for
the player to move off.  Remaining upon the block can kill a player with
low-enough health/armor, or can permanently trap a player who survives the
crushing action (see the demo E4M3STUK.LMP for an example).
The switch on the south wall of the room causes the raised barrier-block to
lower again.
The block was likely meant to be activated by a floor trigger ("tripwire"), not
an integral switch.  The block's existing design means that most players will
never see or trigger it during the course of normal gameplay, and subsequently
the wall switch that controls its descent appears to serve no known function.
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LEVEL E4M4: UNRULY EVIL (3 demos)
-----------------------
E4M4SK12.LMP: 01:28, Skill 2
Notes: Shows how to get 100% Kills on this map when playing at low Skills.
(At Skills 1 and 2 a pair of chambers near the exit do not open when they're
supposed to, and the monsters trapped inside may seem to be unreachable...)
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E4M4SEC.LMP: 00:55, Skill 4, no monsters
Notes: Shows how to access the two "official" secret rooms, and shows how to
open the exit chamber.
One of those rooms can also be accessed through a hidden teleporter, which is
demonstrated below...
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E4M4OTHR.LMP: 00:58, Skill 4, no monsters
Notes: Shows how to gain access to a couple of areas that might be overlooked
and/or may seem inaccessible.  None of these areas are considered "secret" by
the game, and so do not count towards a player's SECRET score.  (The "official"
secret rooms are revealed in E4M4SEC.LMP, above.)
The first area is a spot down in a small lava stream, where a Blur Artifact can
be found.
On the eastern end of the map is a chamber with a matrix of pedestals arrayed
along a corrosive floor.  In this chamber there is a raised shelf-like area in
one wall, and a hidden teleporter in the opposite wall.  Methods for accessing
both areas are shown.
Note that the switch for revealing the teleporter is buried inside the northern
end of one of the pedestals.  This switch can be activated from up on top of
the pedestal, or from the east or west side of the pedestal, once the player
character is positioned and oriented correctly.
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LEVEL E4M6: AGAINST THEE WICKEDLY (2 demos)
---------------------------------
E4M6KEYS.LMP: 01:11, Skill 4, no monsters
Notes: Shows how to access all 3 keys.
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E4M6HOLE.LMP: 00:22, Skill 4, no monsters
Notes: Shows an example of jumping into the raised hole at the southwest corner
of the large, central slime pool.  This hole is one end of a short tunnel that
leads to a small outdoor area.  (A separate tunnel a little farther to the west
also leads there from a higher location.)
One way to make the jump: After teleporting to the ledge, switch to the Automap
view, and walk forward until the player arrow touches the short vertical line
crossing the ledge.  Switch back to normal view and turn right slightly, to aim
just to the left of the center of the hole, then Run forward until you've made
the jump.  (If you miss, turn right and head for the 4-way teleporter/pillar in
the slime, and try again.)
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LEVEL E4M7: AND HELL FOLLOWED
-----------------------------
E4M7EXIT.LMP: 00:37, Skill 4, no monsters
Notes: Shows how to access the exit.
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EPISODE 4 SECRET EXIT/SECRET LEVEL
----------------------------------
UDSECX4.LMP: 00:45, Skill 4, no monsters
Notes: Reveals where and how to access the exit which leads to the secret level
in Episode 4.
(While the demo is running you can press the Tab key to see the current level's
number and name on the Automap screen.)
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