Difference between revisions of "Doom cheat codes"

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==Original game==
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[[Doom]] has many '''cheat codes'''. To use a cheat code in PC versions of the game, one simply types the code while playing (this includes [[automap]] mode). After the last letter of a code has been entered, a message of acknowledgment will appear at the top of the screen. The [[status bar]], [[status bar face|player face]], and in-game view may also change, depending on the effects of the code.
  
To use a cheat code in most versions of the game, one simply types the code while playing (this also applies while in [[automap]] mode).  After the last letter has been entered, a message of acknowledgement will appear at the top of the screen.  The [[status bar]], [[face]], and ingame view may also change, depending on the effects of the code.  All of the codes for the original game work in all ports, unless otherwise noted.
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In the [[Doom Classic (iOS)|Doom Classic]] version of the game for {{wp|iPhone}}, touch the screen with four fingers at any time to bring up an on-screen keyboard.  
  
Cheat codes in [[vanilla Doom]] are disabled on the [[Skill level|Nightmare!]] skill level, except for the <tt>iddt</tt> and <tt>idclev</tt> cheats.  However, many [[source port]]s enable cheats for all skill levels.
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Cheat codes are disabled on the "Nightmare!" [[skill level]], except for the {{c|iddt}} and {{c|idclev}} cheats.
  
In some ports and in the original executables, cheat codes may be different on non-[[Wikipedia:QWERTY|QWERTY]] keyboards. For example, in [[Wikipedia:France|France]], <tt>idkfa</tt> may be <tt>idkfq</tt>, because of the AZERTY keyboard layout commonly used there.
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Cheat codes may be different on non-{{wp|QWERTY}} keyboards. For example, in France, {{c|idkfa}} may be {{c|idkfq}}, because of the {{wp|AZERTY}} keyboard layout commonly used there. This is due to the fact that Doom's keyboard {{wp|interrupt}} handling code reads raw scan codes from the hardware, which are not subject to any form of localization.
  
===All Doom versions===
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==All Doom engine versions==
 
{| {{prettytable}}
 
{| {{prettytable}}
 
|-
 
|-
|idbehold''#''||When ''#'' is one of the letters below, this gives an item:
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! Code !! Effects !! Displayed message
* "R": [[Radiation suit]].
+
|-
* "I": [[Invisibility]].
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|'''idbehold'''''#''||<span id="idbehold"></span>When ''#'' is one of the letters below, this gives the player the chosen power-up:
 +
* "R": [[Radiation shielding suit]].
 +
* "I": [[Partial invisibility]].
 
* "V": [[Invulnerability]].
 
* "V": [[Invulnerability]].
* "A": [[Computer map]].
+
* "A": [[Computer area map]].
 
* "L": [[Light amplification visor]].
 
* "L": [[Light amplification visor]].
 
* "S": [[Berserk]].
 
* "S": [[Berserk]].
In some source ports, radiation suits obtained in this way protect the player from all radiation damage, even on surfaces which inflict [[Damaging floor#Technical_information|20% damage per second]].  Also, in some source ports, when a temporary [[powerup]] (e.g. invulnerability) is gained using <i>idbehold</i>, it is permanent until toggled off again (or the level ends).
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If you already have one of those power-ups in any way; same power-up will be toggled off (with the exception of the Computer area map).
 +
||''When "idbehold" typed:'' "inVuln, Str, Inviso, Rad, Allmap, or Lite-amp"<br />''When final letter is typed:'' "Power-up Toggled"
 
|-
 
|-
|idchoppers<sup>1</sup>||Gives the [[chainsaw]].
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|'''idchoppers'''<ref group="note" name="mnote1"/>||<span id="idchoppers"></span>Gives the option to select the [[chainsaw]].||"... doesn't suck - GM"
 
|-
 
|-
|idclev''##''<sup>2</sup>||Warps to level E''#''M''#'' or MAP''##''.  In vanilla Doom, this has the following side effects:
+
|'''idclip'''||<span id="idclip"></span>No clipping in [[Doom II]] (see {{c|[[#idspispopd|idspispopd]]}} below for technical details).||"No Clipping Mode ON"<br />"No Clipping Mode OFF"
* The player's status is reset to that of a newly launched game (e.g. 100% health, no armor, a [[pistol]] and 50 [[bullets]]). This also deactivates any other powerups still in effect, whether obtained using cheat codes or otherwise.
 
* If the second digit of the level number is 1 (and sometimes even if the first digit is 1), the player will switch to the [[Fists|fist]] upon entering the new level.
 
* The <tt>-respawn</tt> and <tt>-nomonsters</tt> [[command line arguments]] are ignored, if either was used when originally launching the game.
 
* If [[Command line arguments|fast monsters]] were being used before warping (on a skill level other than [[Nightmare!]]), their attack frequency reverts to normal, although the increased speed of [[Demon]]s, [[Spectre]]s, and certain [[projectile]] weapons remains the same.
 
* If activated while the menu system is being used, only half the screen will be updated. The other half will continue displaying a view of the old level until the menus are exited.
 
 
|-
 
|-
|iddqd<sup>3</sup>||Sets health to 100% and makes player immune to damage ("God mode").  In vanilla Doom, if the player is currently standing on or subsequently enters a [[Damaging floor#Technical_information|damaging floor of type 11]], the invulnerability effect is nullified. The invulnerable player can also be killed by a [[telefrag]].<sup>4</sup> Also, projectiles with extremely high damage ratings (such as a [[DeHackEd]] modification) can also kill a player in God mode.
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|'''idclev'''''##''<ref group="note" name="mnote2"/>||<span id="idclev"></span>Warps to level E''#''M''#'' or MAP''##''. This may have certain side effects (see [[IDCLEV idiosyncrasies]]).||"Changing Level..."<ref group="note" name="mnote2a"/>
 
|-
 
|-
|iddt<sup>5</sup>||First time: full [[automap]] (reveals unexplored areas, including invisible linedefs not shown by a [[computer map]] pickup).<br/>Second time: full automap with [[items]], [[Monsters|enemies]], [[Thing_types#Obstacles|obstacles, and decorations]].<br/>Third time: back to normal.
+
|'''iddqd'''<ref group="note" name="mnote3"/>||<span id="iddqd"></span>Sets health to 100% and makes player immune to any damage source dealing less than 1000 damage ("god mode", "degreelessness").  If the player is currently standing on or subsequently enters a [[Damaging floor#Technical_information|damaging floor of type 11]], the invulnerability effect is nullified. The invulnerable player can still be killed by a [[telefrag]], a spawn cube in MAP30, or any modified enemy projectiles with extremely high damage ratings (such as from a [[DeHackEd]] modification).<ref group="note" name="mnote4"/>||"Degreelessness Mode On"<br />"Degreelessness Mode Off"
 
|-
 
|-
|idfa<sup>6</sup>||[[Combat armor|Full armor]], all [[weapons]], and full [[ammo]].  In certain source ports, this also includes a [[backpack]] if the player does not have one already. Includes the chainsaw in certain source ports, but not in vanilla Doom.  Not present prior to [[Ultimate Doom]].
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|'''iddt'''<ref group="note" name="mnote5"/>||<span id="iddt"></span>This cheat reveals information if used while in [[automap]] mode, showing additional data the second time it is used:
 +
* First use: full [[automap]] (reveals unexplored areas, including invisible linedefs not shown by the [[computer area map]] powerup).
 +
* Second use: full automap with [[items]], [[monsters]], [[player]]s, [[Thing_types#Obstacles|obstacles, and decorations]].<br/>
 +
* Third use: the automap is restored to normal.
 +
||None
 
|-
 
|-
|idkfa<sup>7</sup>||Gives all [[Key_(Doom)|keys]], [[combat armor]], all weapons, and full [[ammo]].  In certain source ports, this also includes a backpack if the player does not have one already.  Includes the chainsaw in certain source ports, but not in vanilla Doom.
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|'''idfa'''<ref group="note" name="mnote6"/>||<span id="idfa"></span>This is the same as {{c|idkfa}} below, but excludes the keys.||"Ammo (no keys) Added"
 
|-
 
|-
|idmus##<sup>8</sup>||Plays [[music]] from level E''#''M''#'' or MAP''##''.
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|'''idkfa'''<ref group="note" name="mnote7"/>||<span id="idkfa"></span>Grants full [[megaarmor]] protection (200%), all [[weapons]], full [[ammo]], and all the [[key]]s.||"Very Happy Ammo Added"
 
|-
 
|-
|idmypos<sup>9</sup>||Shows the player's coordinates and compass direction (note that these numbers are [[Wikipedia:Hexadecimal|hexadecimal]], and may require some practice to interpret quickly).
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|'''idmus'''##<ref group="note" name="mnote8"/>||<span id="idmus"></span>Plays [[music]] from level MAP''##'' in Doom II, or E''#''M''#'' in [[The Ultimate Doom]]. Using this cheat code will make the player change weapons in hand if the numbers pressed correspond to available weapons. If both digits are 0; Doom II will crash trying to play a non-existent midi file called d_introa, unless such named midi is provided by an external PWAD.||''Valid selection:'' "Music Change"<br />''Invalid selection:'' "IMPOSSIBLE SELECTION"
 
|-
 
|-
|idspispopd<sup>10</sup>||No clipping (the player can walk through walls, monsters, and obstacles, climb high ledges instantly, and pass through [[Thing types|pickups]] and across all tagged [[linedefs]] with no effect. Doom 1/Ultimate Doom only, although some source ports do support it while playing Doom II/Final Doom).
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|'''idmypos'''<ref group="note" name="mnote9"/>||<span id="idmypos"></span>Shows the player's coordinates and compass direction. These numbers are {{wp|hexadecimal}} representations of Doom's internal coordinate format, and can therefore be difficult to read; an [https://soulsphere.org/tools/idmypos.html online IDMYPOS converter] can be used to decode them.||"ang=''[angle]'';x,y=(''[x]'',''[y]'')"
 +
|-
 +
|'''idspispopd'''<ref group="note" name="mnote10"/>||<span id="idspispopd"></span>No clipping (the player can walk through walls, monsters, and obstacles, climb high ledges instantly, and pass through [[Thing types|items]] and across all tagged [[linedefs]] with no effect. This works only in Doom and The Ultimate Doom (see above for the equivalent {{c|idclip}} for Doom II).||"No Clipping Mode ON"<br />"No Clipping Mode OFF"
 
|}
 
|}
<div style="font-size:small">
 
#Prints the message "Doesn't suck - GM". Taylor's explanation for this message: "Choppers is a State Programming Contest game that a friend of mine named Guy Maor (GM) helped write. He's a little defensive of it 'cause it wasn't *quite* finished on the release day. Was a cool two-player Rescue Raiders rip-off. He was drunk and talked to me one night, and I thought I'd put it in."
 
#CLEV stands for ''''c'''hange '''lev'''el'.
 
#Taylor and two fellow [[Wikipedia:Hacker|hackers]] made up an informal fraternity called Delta-Q-Delta (hence the DQD) during their college days. The "Q" stands for "quit", and represents the grade members should strive to receive in their classes.
 
#According to the function P_DamageMobj in [[Doom source code files|p_inter.c]], "invulnerability"  only protects the player from attacks doing less than 1000 [[Hit point|points of damage]], whereas a telefrag inflicts 10000 points. This also means that [[DeHackEd]] can be used to circumvent the God mode cheat by creating incredibly powerful weapons.
 
#DT stands for ''''D'''ave '''T'''aylor'. The code can be used in cooperative [[multiplayer]] games by first pressing T and then typing the code while holding ALT.
 
#FA stands for ''''f'''ull '''a'''mmo'.
 
#KFA stands for ''''k'''ick '''f'''ucking '''a'''ss', '''k'''iller '''f'''ucking '''a'''rsenal or ''''k'''eys & '''f'''ull '''a'''mmo'.
 
#MUS stands for ''''mus'''ic'. This cheat only works in Doom [[Versions of Doom and Doom II#v1.666|version 1.666]] or later. In Ultimate Doom, IDMUS40 - 45 will play music from intermission, main screen and end screen, in Doom II, this is 33 - 35.
 
#MYPOS stands for ''''my''' '''pos'''ition'.
 
#SPISPOPD stands for ''''S''''mashing ''''P''''umpkins ''''I''''nto ''''S''''mall ''''P''''iles ''''O''''f ''''P''''utrid ''''D''''ebris. See more in [[SPISPOPD]] article.
 
</div>
 
  
===Doom II and Final Doom===
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===Notes===
{| {{prettytable}}
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<references group="note">
|idclip||No clipping (some source ports also allow this while playing [[Doom]]/[[Ultimate Doom]]). Doom II version of idspispopd.
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<ref name="mnote1">Prints the message "... Doesn't suck - GM". Taylor's explanation for this message: "Choppers is a State Programming Contest game that a friend of mine named Guy Maor (GM) helped write. He's a little defensive of it 'cause it wasn't *quite* finished on the release day. Was a cool two-player Rescue Raiders rip-off. He was drunk and talked to me one night, and I thought I'd put it in." This cheat code was also apparently meant to make the player invulnerable, but [[Chainsaw#Notes|due to a typo]] the invulnerability only lasts one [[tic]]. </ref>
|}
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<ref name="mnote2">CLEV stands for ''''c'''hange '''lev'''el'; it could also be interpereted as "see (C) level."</ref>
 +
<ref name="mnote2a">This message appears in the source code, but is not actually displayed in the original DOS executables. It is, however, displayed in some source ports.</ref>
 +
<ref name="mnote3">Taylor and two fellow {{wp|hacker}}s made up an informal fraternity called Delta-Q-Delta (hence the DQD) during their college days. The "Q" stands for "quit", and represents the grade members should strive to receive in their classes.</ref>
 +
<ref name="mnote4">According to the function {{c|P_DamageMobj}} in {{c|[[Doom source code files|p_inter.c]]}}, "invulnerability"  only protects the player from attacks doing less than 1000 [[Hit point|points of damage]].  There is no form of attack in the game that does more damage than this number, except one: a [[telefrag]], which inflicts 10000 points on the target.  This is why a player in God mode can still be killed by telefragging.  This also means that [[DeHackEd]] can be used to circumvent god mode by creating incredibly powerful weapons; some examples of this effect can be found in [[The Sky May Be]].</ref>
 +
<ref name="mnote5">DT stands for ''''D'''ave '''T'''aylor'. The code can be used in cooperative [[multiplayer]] games by first pressing T and then typing the code while holding ALT.</ref>
 +
<ref name="mnote6">FA stands for ''''f'''ull '''a'''mmo'. This cheat code is not present in versions prior to [[Versions of Doom and Doom II#v1.666|1.666]].</ref>
 +
<ref name="mnote7">According to John Romero in an interview in ''[[The Official Doom Survivor's Strategies & Secrets]]'', KFA stands for ''''k'''iller '''f'''ucking '''a'''rsenal'. Frequent fan interpretations include ''''k'''ick '''f'''ucking '''a'''ss' and ''''k'''eys and '''f'''ull '''a'''mmo'.</ref>
 +
<ref name="mnote8">MUS stands for ''''mus'''ic'. Certain selections may call for invalid music lumps (see [[IDMUS requests invalid music]]). In [[The Ultimate Doom]], {{c|idmus40}} will play the same music as {{c|idmus39}} ({{c|D_E3M9}}) and {{c|idmus41}} to {{c|idmus45}} will play music from the intermission, main, and end screens. In [[Doom II]], the non-level tracks are {{c|idmus33}} to {{c|idmus35}}.</ref>
 +
<ref name="mnote9">MYPOS stands for ''''my''' '''pos'''ition'.</ref>
 +
<ref name="mnote10">SPISPOPD stands for ''''S''''mashing ''''P''''umpkins ''''I''''nto ''''S''''mall ''''P''''iles ''''O''''f ''''P''''utrid ''''D''''ebris. See more in [[SPISPOPD]] article.</ref>
 +
</references>
 +
 
 +
==Doom95==
 +
The prefix FH in [[Doom95]] cheat codes stands for the initials of Fred Hommel, the programmer who created the codes.
  
===Doom 95===
 
 
{| {{prettytable}}
 
{| {{prettytable}}
|fhhall||Kills all [[monsters]] in the level, excepting [[Lost Soul]]s and the [[Icon of Sin]]. ([[Pain Elemental]]s killed in this manner will still generate extra Lost Souls as normal.)
 
 
|-
 
|-
|fhshh||Monsters do not notice players unless they are hurt or hear a shot. This is similar to the "notarget mode" found in many newer games.
+
! Code !! Effects
 +
|-
 +
|'''fhhall'''<sup>1</sup>||Kills all [[monsters]] in the level, excepting [[lost soul]]s. ([[Pain elemental]]s killed in this manner will still generate extra lost souls as normal).
 +
|-
 +
|'''fhshh'''<sup>2</sup>||Monsters do not notice players unless they are hurt or hear a shot.
 
|}
 
|}
The prefix "fh" stands for the initials of Fred Hommel, the [[Doom 95]] author who created the codes.
+
# HALL refers to Jason Hall, CEO of {{wp|Monolith Productions}}, who requested that particular cheat (hence the "BY REQUEST..." message that displays when the code is executed). The actual damage done to each monster is 10,000 [[hit points]].
 
+
# Upon typing the {{c|fhshh}} cheat the message "be vewy vewy quiet..." is displayed. This is a reference to {{wp|Elmer Fudd}}'s catchphrase "Be vewy vewy quiet, I'm hunting wabbits!", in the beginning of a {{wp|Looney Tunes}} or {{wp|Merrie Melodies}} animated short. The message "Achoo!" appears when the cheat is disabled (the joke being that you sneezed, and the monsters have heard you).
The "hall" in "fhhall" refers to Jason Hall, CEO of [[Wikipedia:Monolith Productions|Monolith]], who requested that particular cheat (hence the "BY REQUEST..." message that displays when the code is executed). The actual damage done to each monster is 10,000 [[Hit point|points]].
 
 
 
Upon typing the "fhshh" cheat the message "Be vewy vewy quiet..." is displayed. This is a reference to [[Wikipedia:Elmer Fudd|Elmer Fudd]]'s catchphrase, "Be vewy vewy quiet. I'm hunting wabbits." in the beginning of a [[Wikipedia:Looney Tunes|Looney Tunes]] or [[Wikipedia:Merrie Melodies|Merrie Melodies]] animated short. The message "Achoo!" appears when the cheat is disabled.
 
 
 
  
 
==See also==
 
==See also==
 
*[[Cheat codes]]
 
*[[Cheat codes]]
 
*[[SPISPOPD]]
 
*[[SPISPOPD]]
*[[Doom RPG cheat codes]]
+
*[[Source port cheat codes]]
 +
*[[Console Doom cheats]]
 +
*[[Player face grins after restoring savefile]]
  
 
==Sources==
 
==Sources==
*[http://classicdoom.com/doomcode.htm ClassicDOOM.com's cheats guide]
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*[http://www.classicdoom.com/doomcode.htm ClassicDOOM.com's cheats guide]
*[http://www.rome.ro/lee_killough/history/cheat.shtml The etymology of Doom cheat codes], from Lee Killough's archive
+
*[https://web.archive.org/web/20120418082403/http://rome.ro/lee_killough/history/cheat.shtml The etymology of Doom cheat codes], from Lee Killough's website (archived)
*[http://groups.google.com/group/alt.games.doom/msg/55cac0778658fa8d?hl=en& alt.games.doom post about creating weapons that can kill invulnerable players], via [http://groups.google.com Google Groups]
+
*[https://groups.google.com/group/alt.games.doom/msg/55cac0778658fa8d?hl=en& alt.games.doom post about creating weapons that can kill invulnerable players], via [https://groups.google.com Google Groups]
*[http://groups.google.com/group/rec.games.computer.doom.editing/msg/4e57a0c1446f8be3?hl=en& rec.games.computer.doom.editing post about creating weapons that can kill invulnerable players], via [http://groups.google.com Google Groups]
+
*[https://groups.google.com/group/rec.games.computer.doom.editing/msg/4e57a0c1446f8be3?hl=en& rec.games.computer.doom.editing post about creating weapons that can kill invulnerable players], via [https://groups.google.com Google Groups]
  
 
[[Category:Cheating]]
 
[[Category:Cheating]]
 
[[Category:Lists]]
 
[[Category:Lists]]

Revision as of 00:51, 11 July 2020

Doom has many cheat codes. To use a cheat code in PC versions of the game, one simply types the code while playing (this includes automap mode). After the last letter of a code has been entered, a message of acknowledgment will appear at the top of the screen. The status bar, player face, and in-game view may also change, depending on the effects of the code.

In the Doom Classic version of the game for iPhone, touch the screen with four fingers at any time to bring up an on-screen keyboard.

Cheat codes are disabled on the "Nightmare!" skill level, except for the iddt and idclev cheats.

Cheat codes may be different on non-QWERTY keyboards. For example, in France, idkfa may be idkfq, because of the AZERTY keyboard layout commonly used there. This is due to the fact that Doom's keyboard interrupt handling code reads raw scan codes from the hardware, which are not subject to any form of localization.

All Doom engine versions

Code Effects Displayed message
idbehold# When # is one of the letters below, this gives the player the chosen power-up:

If you already have one of those power-ups in any way; same power-up will be toggled off (with the exception of the Computer area map).

When "idbehold" typed: "inVuln, Str, Inviso, Rad, Allmap, or Lite-amp"
When final letter is typed: "Power-up Toggled"
idchoppers[note 1] Gives the option to select the chainsaw. "... doesn't suck - GM"
idclip No clipping in Doom II (see idspispopd below for technical details). "No Clipping Mode ON"
"No Clipping Mode OFF"
idclev##[note 2] Warps to level E#M# or MAP##. This may have certain side effects (see IDCLEV idiosyncrasies). "Changing Level..."[note 3]
iddqd[note 4] Sets health to 100% and makes player immune to any damage source dealing less than 1000 damage ("god mode", "degreelessness"). If the player is currently standing on or subsequently enters a damaging floor of type 11, the invulnerability effect is nullified. The invulnerable player can still be killed by a telefrag, a spawn cube in MAP30, or any modified enemy projectiles with extremely high damage ratings (such as from a DeHackEd modification).[note 5] "Degreelessness Mode On"
"Degreelessness Mode Off"
iddt[note 6] This cheat reveals information if used while in automap mode, showing additional data the second time it is used: None
idfa[note 7] This is the same as idkfa below, but excludes the keys. "Ammo (no keys) Added"
idkfa[note 8] Grants full megaarmor protection (200%), all weapons, full ammo, and all the keys. "Very Happy Ammo Added"
idmus##[note 9] Plays music from level MAP## in Doom II, or E#M# in The Ultimate Doom. Using this cheat code will make the player change weapons in hand if the numbers pressed correspond to available weapons. If both digits are 0; Doom II will crash trying to play a non-existent midi file called d_introa, unless such named midi is provided by an external PWAD. Valid selection: "Music Change"
Invalid selection: "IMPOSSIBLE SELECTION"
idmypos[note 10] Shows the player's coordinates and compass direction. These numbers are hexadecimal representations of Doom's internal coordinate format, and can therefore be difficult to read; an online IDMYPOS converter can be used to decode them. "ang=[angle];x,y=([x],[y])"
idspispopd[note 11] No clipping (the player can walk through walls, monsters, and obstacles, climb high ledges instantly, and pass through items and across all tagged linedefs with no effect. This works only in Doom and The Ultimate Doom (see above for the equivalent idclip for Doom II). "No Clipping Mode ON"
"No Clipping Mode OFF"

Notes

  1. Prints the message "... Doesn't suck - GM". Taylor's explanation for this message: "Choppers is a State Programming Contest game that a friend of mine named Guy Maor (GM) helped write. He's a little defensive of it 'cause it wasn't *quite* finished on the release day. Was a cool two-player Rescue Raiders rip-off. He was drunk and talked to me one night, and I thought I'd put it in." This cheat code was also apparently meant to make the player invulnerable, but due to a typo the invulnerability only lasts one tic.
  2. CLEV stands for 'change level'; it could also be interpereted as "see (C) level."
  3. This message appears in the source code, but is not actually displayed in the original DOS executables. It is, however, displayed in some source ports.
  4. Taylor and two fellow hackers made up an informal fraternity called Delta-Q-Delta (hence the DQD) during their college days. The "Q" stands for "quit", and represents the grade members should strive to receive in their classes.
  5. According to the function P_DamageMobj in p_inter.c, "invulnerability" only protects the player from attacks doing less than 1000 points of damage. There is no form of attack in the game that does more damage than this number, except one: a telefrag, which inflicts 10000 points on the target. This is why a player in God mode can still be killed by telefragging. This also means that DeHackEd can be used to circumvent god mode by creating incredibly powerful weapons; some examples of this effect can be found in The Sky May Be.
  6. DT stands for 'Dave Taylor'. The code can be used in cooperative multiplayer games by first pressing T and then typing the code while holding ALT.
  7. FA stands for 'full ammo'. This cheat code is not present in versions prior to 1.666.
  8. According to John Romero in an interview in The Official Doom Survivor's Strategies & Secrets, KFA stands for 'killer fucking arsenal'. Frequent fan interpretations include 'kick fucking ass' and 'keys and full ammo'.
  9. MUS stands for 'music'. Certain selections may call for invalid music lumps (see IDMUS requests invalid music). In The Ultimate Doom, idmus40 will play the same music as idmus39 (D_E3M9) and idmus41 to idmus45 will play music from the intermission, main, and end screens. In Doom II, the non-level tracks are idmus33 to idmus35.
  10. MYPOS stands for 'my position'.
  11. SPISPOPD stands for 'S'mashing 'P'umpkins 'I'nto 'S'mall 'P'iles 'O'f 'P'utrid 'D'ebris. See more in SPISPOPD article.

Doom95

The prefix FH in Doom95 cheat codes stands for the initials of Fred Hommel, the programmer who created the codes.

Code Effects
fhhall1 Kills all monsters in the level, excepting lost souls. (Pain elementals killed in this manner will still generate extra lost souls as normal).
fhshh2 Monsters do not notice players unless they are hurt or hear a shot.
  1. HALL refers to Jason Hall, CEO of Monolith Productions, who requested that particular cheat (hence the "BY REQUEST..." message that displays when the code is executed). The actual damage done to each monster is 10,000 hit points.
  2. Upon typing the fhshh cheat the message "be vewy vewy quiet..." is displayed. This is a reference to Elmer Fudd's catchphrase "Be vewy vewy quiet, I'm hunting wabbits!", in the beginning of a Looney Tunes or Merrie Melodies animated short. The message "Achoo!" appears when the cheat is disabled (the joke being that you sneezed, and the monsters have heard you).

See also

Sources