"Source port cheat codes"@en . . . . "To activate a cheat in most versions, 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. Cheat codes in vanilla Doom are disabled on the \"Nightmare!\" skill level, except for the iddt and idclev cheats. However, many source ports enable cheats for all skill levels."@en . . "To activate a cheat in most versions, 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. Cheat codes in vanilla Doom are disabled on the \"Nightmare!\" skill level, except for the iddt and idclev cheats. However, many source ports enable cheats for all skill levels. In some ports and in the original executables, 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. In some source ports, radiation suit effects obtained using idbeholdr protect the player from all radiation damage, even on surfaces which inflict 20% damage per second. Also, in some source ports, when a temporary powerup (e.g. invulnerability) is gained using idbehold, it is permanent until toggled off again (or the level ends). In certain source ports, the idfa and idkfa cheats also include a backpack if the player does not have one already. Some source ports enable both no-clipping cheats (idspispopd and idclip) to function while playing either game."@en . .