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File:Doomkeys.png
The three keycards, the skull keys, and the corresponding status bar icons.

A key is an item used to open designated locked doors or switches.

Description

File:Doom2 yellow skull.png
The yellow skull key as seen in MAP28 of Doom II

There are two types of key: electronic keycards, and skull keys which resemble glowing monochrome skulls. If the player encounters a locked door and attempts to open it without the correct key, the door will not open (and the player will receive a message to that effect). Once a key is obtained, any locked door of the corresponding color on the map can be opened. All keys are lost upon exiting a map.

Multiple keys of a given color may be picked up in the same level; the status bar will display whichever type was last taken. Doors in vanilla Doom are affected identically by keycards and skull keys. In stock maps, as a cosmetic guideline, a bar of coloured lights surround a locked door when keycards are used, while a column of coloured skulls are used for skull keys. (However, this is occasionally violated, such as in E2M3: Refinery which had keycard pickups but skull doorframes.)

In multiplayer deathmatch games, all keys are removed from each map, and players spawn carrying all keys.

Enhancements

Ultimate Doom and Final Doom introduced "locked" switches, which cannot be activated without a key of the appropriate color.

Boom introduced door types that require the key to be of the right type and not just the right color. Such doors are supported in most source ports.

Certain source ports also allow the use of locked doors requiring multiple keys, a situation sometimes approximated in the original games by placing several locked doors in front of each other (e.g. E2M6: Halls of the Damned).

Data

The yellow keycard in MAP02 of Alien Vendetta
The red skull key in MAP09 of Alien Vendetta
Blue keycard data
Thing type 5 (decimal), 5 (hex)
Appears in Shareware Doom
Registered Doom
Ultimate Doom
Doom II/Final Doom
Radius 20
Sprite BKEY
Class Key
Pickup
Red keycard data
Thing type 13 (decimal), D (hex)
Appears in Shareware Doom
Registered Doom
Ultimate Doom
Doom II/Final Doom
Radius 20
Sprite RKEY
Class Key
Pickup
Yellow keycard data
Thing type 6 (decimal), 6 (hex)
Appears in Shareware Doom
Registered Doom
Ultimate Doom
Doom II/Final Doom
Radius 20
Sprite YKEY
Class Key
Pickup
File:E4m1 nin and blue skull.png
The blue skull key in E4M1 of Doom
The blue keycard in ATTACK.WAD from the Master Levels
Blue skull key data
Thing type 40 (decimal), 28 (hex)
Appears in Registered Doom
Ultimate Doom
Doom II/Final Doom
Radius 20
Sprite BSKU
Class Key
Pickup
Red skull key data
Thing type 38 (decimal), 26 (hex)
Appears in Registered Doom
Ultimate Doom
Doom II/Final Doom
Radius 20
Sprite RSKU
Class Key
Pickup
Yellow skull key data
Thing type 39 (decimal), 27 (hex)
Appears in Registered Doom
Ultimate Doom
Doom II/Final Doom
Radius 20
Sprite YSKU
Class Key
Pickup

Appearance statistics

The IWADs contain the following numbers of keys:

Blue keycard

Game ITYTD and HNTR HMP UV and NM
Ultimate Doom 11 11 11
Doom II 14 14 14
TNT: Evilution 17 17 17
Plutonia 11 11 11

Red keycard

Game ITYTD and HNTR HMP UV and NM
Ultimate Doom 7 7 7
Doom II 11 11 11
TNT: Evilution 18 18 18
Plutonia 7 7 7

Yellow keycard

Game ITYTD and HNTR HMP UV and NM
Ultimate Doom 9 9 9
Doom II 9 9 9
TNT: Evilution 14 14 14
Plutonia 8 8 8

Blue skull key

Game ITYTD and HNTR HMP UV and NM
Ultimate Doom 15 15 15
Doom II 8 8 8
TNT: Evilution 8 8 8
Plutonia 11 11 11

Red skull key

Game ITYTD and HNTR HMP UV and NM
Ultimate Doom 12 12 12
Doom II 8 8 8
TNT: Evilution 10 10 10
Plutonia 12 12 12

Yellow skull key

Game ITYTD and HNTR HMP UV and NM
Ultimate Doom 11 11 11
Doom II 8 8 8
TNT: Evilution 8 8 8
Plutonia 14 14 14

Doom RPG

Keycards appear in Doom RPG, but skull keys do not.

See also

External links