The following codes are typed during gamplay:

fhhall-Kill all enemies in level 
fhshh-Invisible to enemies until attack 
idclev (level number 01-32)-Level select 
idchoppers-Chainsaw 
idbeholds-Berserker strength 
idbeholdv-Temporary invincibility 
idbeholdi-Temporary invisibility 
idbeholda-Full automap 
idbeholdr-Anti-radiation suit 
idbeholdl-Light amplification visor 
idclip-Walk through walls 
iddt-Toggle full map; full map and objects; normal map 
iddqd-Invincibility 
idfa-Reset ammunition 
idkfa-All weapons, keys, ammo, and 200% armor 
idmypos-Display coordinates and heading 
idmus (level number 01-32)Change music to indicated level 
Deathmatch cheat mode:
Type t in the map to enter talk mode. Hold [Alt] and type iddt several times. This will reveal the entire map. Repeat the code to reveal all items. Repeating the code again will return the map to normal. 

Network cheat mode:
Hold [Alt] and type iddtiddtiddtiddt in map mode. 

SECRETS LIST
================

All the official secret areas in the game are numbered and listed below,
along with the sector number, IDMYPOS coordinates, and decimal coordinates.
"Official" secrets are those which are counted towards the "Secrets" total
on the end level screen. Some non-secret areas which are hard to find
are also listed, but are not numbered.

Level 1: Entryway
1 41 < 8b00000,13700000> ( 2224, 4976)
In the northernmost room, you see two switches; a near one on your
right, and a far one on your left. The one on the right opens a
small area to the northeast with some armor and health. Hit the
right switch before the left one, since the left one makes the right
one go away. (Although if you stand in the right place and hit the space
bar, you can still open the secret door, even if the switch is gone.)
2 8 < 67c0000, bd80000> ( 1660, 3032)
3 17 < 9b80000, a0c0000> ( 2488, 2572)
4 57 < 9a10000, f800000> ( 2465, 3968)
In the center room (just south of the exit), there is a lift to the
west. Go up the lift and hit space on the wall to the west,
revealing a few imps and a switch (#2) which opens a door leading
outside in the southeast corner of the center room. Outside (#3)
are some imps and a shotgun. Once you hit the switch at the top of
the lift, jump down onto the platform just east of the lift. This
will open a room with a rocket launcher to the north and east (#4).
5 28 < b4e0000, ba60000> ( 2894, 2982)
A room with two imps and a stimpack, behind a hidden door on the
south side of the east wall of the center room.

Level 2: Underhalls
1 20 < a4c0000, 87b0000> ( 2636, 2171)
Just southwest of the red keycard (at the top of the steps) lies a room
with blue armor. There is also a teleporter back to the beginning.
(To get the red keycard, find the building it's in, and walk to the south
side of the ledge to the east of that building. Then run west over
the rift and into the building through the window. Hold down the ALT
key and hit the up arrow to run. The red key is just up the steps.)

Level 3: The Gantlet
1 5 < da00000, ac90000> ( 3488, 2761)
In the main room, south of the two sets of stairs and the rocket
launcher, is a small outcropping with a ledge. You can make it over
the ledge if you run southeast at the right angle from the raised
area west of the stairs. Try standing at  at angle
dbf00000 (or thereabouts) and running straight forward. Once you
make it, walk through the south wall to a small room (#1),
containing a supercharger and partial invisibility. There is also a
teleporter to the tower with the rocket launcher.

Level 4: The Focus
1 15  ( -566, 1161)
The hallway south of the starting point leads to a staircase, then
curves east to a door. On the left side of the corridor are some
windows into rooms containing armor and lots of sargeants. Near the
east end of the corridor, there is a hidden door on the north wall,
just to the right of the window, which lets you into the south
windowed room (#1), and from there to the north windowed room.
2 14  ( -510, 843)
On the way to the blue key is a room with a lava pool in the
northwest. Jump in the pool; there is a secret door to the north,
leading to a room (#2) containing a double-barreled shotgun.
3 43  ( -97, 1573)
Once you get the red key, walk east off the platform. There is a
teleporter there, which takes you to the area just south of the
staircase mentioned above.

Level 5: The Waste Tunnels
1 139 < 6840000, 1c00000> ( 1668, 448)
Just behind the supercharger in the north area of the map (not the
one at the start) is a small room with a beserker.
2 3 < 3510000, 1ad0000> ( 849, 429)
Starting in the room with the blue key (the one with red doors at
the west and east ends), walk north through the window and press
space on the north wall. Then run north until you're in the room
with the plasma gun. Another way to do this is to go to the room
just south of the starting point, then walk to the southeast corner
of the room. Go southwest out the window onto the balcony to
the south, then go east and hit space on the north wall and run north.
3 52 < 1800000,fa440000> ( 384, -1468)
On either side of the exit are doors to a room containing some ammo.
Jump down from one of the ledges on the west or east sides of the
room.

Level 6: The Crusher
1 98 < 4200000, 2600000> ( 1056, 608)
Of the two southernmost pillars in the room just west of the starting
point, the eastern one contains a secret. Hit space on its north or
east wall to lower it, revealing a megasphere.
2 124 < 24e0000, 1130000> ( 590, 275)
The poison river in the room with the blue keycard leads southeast to
a room with a teleporter, which takes you to the staircase just east
of the plasma rifle.
3 146  ( -190, 1874)
In the northwest corner of the room with the spiral staircase is a
little outcropping with a few chaingun sargeants. You can jump into
it from higher up on the staircase. (Don't try jumping straight
west; you need to jump a little bit north, too. Try running
straight ahead from <1698256,70dce25> at angle <6d480000>.) In the
middle of its west wall is a door leading to a secret room with lots
of cool stuff, including a megasphere.

Also: the blue door north of the starting room leads to a lift. After
lowering the lift, you will see a little room to the south of the
lift with some armor.

Level 7: Dead Simple
1 1  ( -608, -160)
The platform around the end-level switch in the center. Kinda hard to
avoid, unless you're playing deathmatch, in which case there is another
end-level switch (along with a BFG9000) in the northwest corner of the map.
There is no way into that room from the outside, so you can't enter it in
single player. There is a deathmatch start in there, however, and you
can open the door from the inside.

Level 8: Tricks and Traps
1 6 < f200000, 74c0000> ( 3872, 1868)
2 125 < f200000, ae40000> ( 3872, 2788)
3 12 <10550000, 9200000> ( 4181, 2336)
4 9 <102c0000, a290000> ( 4140, 2601)
Through the door east of the starting point is a room with three
teleporters; two obvious ones to the left and right, and a third one
in the center which you can get to by shooting the lion. All three
take you to a small octagonal room with a pillar in the center. The
left, right, and center teleporters take you to the north, south,
and east ends of the room, respectively. Shoot the north and south
sides of the pillar to open up secret doors behind the teleport
exits, revealing some ammo (#1), and a chaingun (#2); unfortunately,
it also reveals some pain elementals, so you can decide for yourself
if it's worth the trouble. From the east end of the room (which is
secret #3), if you jump west over the slime to the center of the
room, a door will open up in the northeast corner of the room.
Actually, hitting space on the door will have the same effect. This
door (#4) leads to two radiation suits, ammo, partial invisibility,
and a teleporter back to the octagonal room.
5 57 < 2f40000, 9500000> ( 756, 2384)
Through the door southwest of the starting point is a cacodemon and a
chainsaw. As you take the chainsaw, a door will open up revealing a
little more of the passageway (#5), containing some ammo and green
armor, as well as a baron, who will teleport to the east to block
your exit.
6 100 < bc00000,10320000> ( 3008, 4146)
7 98 < ea40000,11400000> ( 3748, 4416)
In the room with way too many demons are two switches on the south side.
The west one opens a door on the north wall leading to another door.
If you have hit the switch in the room with all the cacodemons, then
this door will be open, leading to a room (#6) with even more demons
(though you won't see them at first; some doors open after you pass
by them). There is a candle on the east side of it, marking a door
which you can shoot open to reveal the BFG9000 (#7).

To get to the exit, open the red door. You will face a bunch of platforms
which lower as you walk up to them. If you run fast enough, you can
run past them right to the exit door. If you can't run that fast,
you can just walk up to the first one and then back up quickly. This
will reveal a teleporter in the room with the cacodemons (to the north of
the starting point), on the left as you enter the room.

Level 9: The Pit
1 109  ( -928, 608)
2 118  ( -761, 773)
West of the starting point is a corridor leading to the supercharger.
Once you get it, one of the corridor walls will open up, revealing a
doom containing a rocket launcher and two rockets. You can try to
jump for the launcher, or you can just walk off the northeast edge of
the platform on the southwest corner of the room; the floor will
raise up so you can easily get the launcher (#1). Once you do,
some doors to the north and east will open up, revealing some sargeants.
If you try to walk onto the platform with the rockets (#2), some doors
will open up behind you revealing a wall of chaingunners, who will
probably negate whatever benefit the supercharger gave you. :-)
3 16 < 5c00000, 6db0000> ( 1472, 1755)
4 17 < 5ac0000, 6c00000> ( 1452, 1728)
5 22 < 5840000, 6ec0000> ( 1412, 1772)
On the east side of the map is a room with a hexagonal structure with
imps and sargeants firing down at you. If you walk up to the structure,
the ledge that the bad guys are standing on will lower you, allowing
you to walk up onto it (#3). On the north side of the structure is
a door leading to interior of the structure (#4), which is crammed
with imps and lost souls. Opposite the door, and a bit to the right,
is a hidden door leading to the BFG9000 (#5).
6 43 < 2d50000, c950000> ( 725, 3221)
In the northeast corner of the map is a spiral staircase of sorts, a
large, circular series of steps that lower as you walk up to them.
If you make it all the way up the staircase (clockwise), you can jump
down to an area with ammo, a supercharger, blue armor, beserk, and
a teleporter back to your starting point.

Level 10: Refueling Base
1 114  ( -606, 584)
2 111  ( -608, 312)
3 112  ( -224, 640)
4 116  ( -986, 640)
The round skylit room south of the starting point has four big brown
pillars, each of which contains a secret area. These pillars open
when you enter the room from various directions. When you enter
from the south, the center (#1) and south (#2) pillars open doors
facing each other; they contain health and various monsters. The
south one contains a radiation suit, which can come in handy, since
all these secret areas have acid floors. When you enter from the
west, the east pillar opens, revealing health, ammo, and various
monsters, which may include a pain elemental or two (#3). When you
enter from the east, the west pillar opens, revealing the same sort
of thing (#4).
5 5 < 5c00000, 8c40000> ( 1472, 2244)
6 12 < 3c60000, 7000000> ( 966, 1792)
7 26 < 80a0000, 5c00000> ( 2058, 1472)
8 180  (-1872, -1696)
9 34 < 57a0000, 5400000> ( 1402, 1344)
10 49 < 37d0000, 4d50000> ( 893, 1237)
11 80 < 6400000, 3480000> ( 1600, 840)
In the northeast corner of the map is a room with a lot of sargeants
and former humans. There are a lot of small niches in this room;
several of them have secret doors behind them which you can shoot
open. You can usually identify them by the fact that they have the
large white UAC logo on them, rather than the small gray ones.
There are five such secret doors; behind them, you can find a
supercharger (#5); light amplification and 200% armor (#6); health,
armor, demons, a backpack, and a teleporter (#7) (the teleporter,
which is behind the door at the end of the hidden hallway, takes you
to room in the southwest (#8), with a invulnerability and an ammo
box, just west of the room with the cyberdemon); an energy pack
(#9); and armor, a beserker, ammo, and various monsters (#10). Also,
the switch in the southeast corner of the room opens a door to a
hidden hallway (#11) which leads to the room with all the
arachnotrons.
12 74 < 7a50000,fbbd0000> ( 1957, -1091)
13 71 < 6840000,fc000000> ( 1668, -1024)
In the southeast corner of the arachnotron/revenant room is a secret
door to a hallway (#12) leading south; it contains light amplification
goggles. The secret door you emerge from is marked with green pillars.
Up the steps to your north is another secret door, also marked
with green pillars; it contains armor, beserk, and ammo (#13).
14 101 < 600000,fffb0000> ( 96, -5)
15 59 < 1c0000,fcc00000> ( 28, -832)
In the room with the rocket launcher on the pedestal, northwest of
the room with secret door #13, you can run past the rocket launcher and
get onto the north ledge with the imps on it (#14). There is some
health and green armor up there. The ledge on the south side of the
room is actually a lift, which you can lower by hitting space.
There are two boxes of rockets up there (#15).
16 120  (-1824, 1264)
17 121  (-1824, 1248)
18 122  (-1824, 1248)
In the northwest, there is a room with two acid floor areas and
some pillars with stuff hidden behind them. On the southwest wall,
there is a section of wall with mismatched texture; when you
walk near that section of wall, a door opens in the northwest
acid pool. The door leads to a megasphere, which counts as
three secrets (#16, #17, #18).

Also note that just southeast of your starting point is a secret
door to a room with some goodies, but it's not an official secret.

Level 11: 'O' of Destruction!
1 28 < 6600000, 3240000> ( 1632, 804)
On the east side of the map is a small room containing a chaingun
with green torches on either side; you get to it via a lift which
lowers when you come down a set of stairs. On the south side of
this room is a secret door, which opens onto a hallway (#1) which
leads to a ledge where you can get partial invisibility. Also, note
that there is a supercharger west of the set of stairs mentioned
above, on the left (south) side of the door. Just walk through the wall
to the right of the green torch.
2 75 < 67e0000, 71f0000> ( 1662, 1823)
On the east side of the outer part of the circle (north of the
walkway leading east, south of the outcropping with the supercharger
on it) is a hidden door in the slime. It opens when you cross the
trigger that reveals the arch-vile. The door leads to some boxes of
rockets (#2) and a teleporter which takes you to some energy packs
in the center of the circle.
3 114  ( -184, 2556)
In the northwest corner of the map is a series of bars which open
automatically when you approach. Just north of the bars is a secret
door (#3) leading west to the hell knight and invulnerability.

The exit for this level is north of the circle. The passage curves
east and leads to a pit with a small structure. (To the left of the
structure is a passage which leads to a beserker; the the right is a
BFG9000.) Enter the structure, take the north lift, and hit the
switch, which lowers the south lift for a short time. Quickly jump down,
take the south lift to the top, and hit the switch. Then go east to the
exit switch (that big skull with the sunglasses); if you want, you can
stop on the way and go through the teleporter to the south, which takes
you to a supercharger.

Level 12: The Factory
1 26  ( -619, 768)
In the northwest corner of the big main building is a room with
jagged walls (#1); it contains a BFG9000 and lots of chaingunners.
To open the door leading there, you must hit the switch in the
southeast corner of the room with the blue door facing northwest.
Note that there is a radiation suit in the southwest corner of
that room.
2 85 < 3040000, 2c00000> ( 772, 704)
The room with the blue door facing northeast (with the platforms
that lower as you reach them) contains a teleporter to a ledge
facing northeast outside the building. From there, you can jump
down to the southwest and get three boxes of ammo (#2). Hopefully
you already killed the mancubus. This room also contains a switch
which helps you get secret #4.
3 155  ( -264, -909)
4 122  ( -96, 288)
In the southwest corner of the map is a small building with some
crates. High on the east wall are a chaingun and some ammo (#3);
you can get to them by stepping from crate to crate until you
get to the lift (the switch), and then use the lift to get up
to ledge they're on. In the southwest corner of the room is
a teleporter which takes you to the square structure in the center
of the big main building. If you hit the switch mentioned in #2
already, then the center of this structure will be raised up so
that you can just grab the supercharger (#4). If you haven't,
then you'll be surrounded by four imps scratching away at you.
Kill them and hit the switch, which will raise the floor up so
you can get the supercharger.

There is no red key on this level. Once you enter the room which leads
to the exit, you can't leave, unless you're playing deathmatch.

Level 13: Downtown
1 3 < 5000000,f68b0000> ( 1280, -2421)
There is a building in the southeast with a switch next to a
lift. Hit the switch and take the lift up. There are two
doors; the right door won't open. Take the left one and jump
across the slime pit to the other side (#1); there's a computer
map and a chaingun.
2 74  ( -848, -3362)
3 11 < 2e00000,f3d00000> ( 736, -3120)
In the southwest corner of the building in the southwest corner of
the map is a switch which opens a door leading outside. There's
a medikit and some ammo out there (#2). Just to the east of
the switch is a stack of crates which you can lower by hitting
the space bar, revealing another switch. After you hit the
switch, you can walk around the stack of crates to your north
to find a set of stairs leading up to a teleporter. The teleporter
takes you to a ledge just west of the starting point (#3). From
this ledge, you can run north into the building with the
supercharger.
4 108  ( -736, -2200)
The building in the southwest corner of the map has a pit in the
northwest corner, which leads to a lift. The lift takes you up
into another building. Just across from the lift (to the east)
is a switch; hitting the switch opens a door revealing some
shotgun shells (#4).
5 128  ( -72, -2184)
The building with the revenants guarding it (the one with the
blue door at the entrance) contains a crate with a switch on
the north side. You can hit the switch to lower the northeast
platform, so you can get the chainsaw (#5).
6 166 < 2400000, d20000> ( 576, 210)
The structure with the red keycard on top of it has a hidden door
in the middle of the north wall, which can be reached from the
ground. The door opens to reveal some blue armor (#6).
7 213  ( -192, 4)
In the northeast corner of the map is a teleporter which takes
you to the ledge of a building with some imps. Jump over to
the ledge of the building just to the west. There's a door
there which leads to a teleporter, which takes you to the
interior of a building farther north, right between two cacodemons
(#7). There's a lot of ammo in there too. Hit space on the inner
wall to get out.
8 223  ( -62, -913)
The building just southeast of the crusher with the plasma gun has a
door in the south wall with a stairway leading up to a blue door.
Once you have the blue key, you can enter out and get some ammo and
rockets (#8).

Level 14: The Inmost Dens
No official secrets. One way to get the supercharger is to go to
the building east of the starting building via the bridge. Enter
the building through the south door. Run out one of the windows
facing west into the moat, south of the bridge. Lower the lift
in the southwest corner, then go through, and go east, kill the
arachnotron, and get the supercharger.

Level 15: Industrial Zone
1 290 < 11c0000, 600000> ( 284, 96)
Get the red card key. (See below for help on how to do this.) Then
jump down to the ground, just to the east of the platform the red
key is on. There is a beserk box there. Hit the space bar on the
crate just to your east to lower it, and get the stimpack (#1).

The red card key is not a secret, but a lot of people have trouble


Submitted by: Paul Trammel" 
To get all weapons & keys type "I D K F A".

Type "IDBEHOLD" then to active a cheat just hit one of these buttons.
"I"(invisibility),"V"(invunerbility),"L" (light),i`m not sure of the 
rest but try out different keys after typeing "IDBEHOLD"