To use a cheat code in most versions of Heretic, 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 and ingame view may also change, depending on the effects of the code. All of the codes for the original game work in all source ports, unless otherwise noted.
|quicken||Makes the player immune to damage ("God mode").|
|ponce||Sets health to 100%.|
|kitty||No clipping (the player can walk through walls, characters, and obstacles, climb high ledges instantly, and pass through items and across all tagged linedefs with no effect).|
|massacre||Kills all monsters on the current level.|
|rambo||Gives all weapons with full/double ammo. It also gives the maximum armor (100 points on shareware, 200 points in registered version).|
|skel||Gives all keys.|
|gimme##||The code is followed by a letter (a-j) and a number (1-9). If 'z' is entered as the item, and '0' (zero) is entered as the amount, the player is given 5 of each item. In patched games, this code gives the maximum of everything instead. The letter defines which item is given, the number the amount of items given. The letters and corresponding items are:
Note: The Mystic Urn and the Chaos Device are not available in the Shareware/unregistered version of the game.
|shazam||Gives and activates the Tome of Power.|
|engage##||Warps to level E#M#.|
|ravmap||First time: full automap (reveals unexplored areas)
Second time: full automap with (remaining) items and enemies.
Third time: back to normal.
|ravpic||Type at the title screen: makes the F1 key take screenshots instead of displaying the in-game help.|
|ticker||Toggles ticks-per-frame counter.|
|noise||Toggles sound debug.|
|cockadoodledoo||Turns the player into a chicken.|
|iddqd||Kills the player. Originally the Godmode cheat in Doom, it is a joke by the developers by making it have the opposite effect in Heretic. When entered, on the screen is displayed: "Trying to cheat, eh? Now you die!"|
|idkfa||Removes all weapons and ammo the player is carrying, except for the staff. Any weapon that exists as a map item can be regained by picking one up, but the Elven Wand will be lost for the remainder of the game session. It can, however, be recovered by using the "rambo" code. Just like the 'iddqd' cheat, this code is from Doom. In Doom, it gives all keys, armor and ammo. In Heretic it does the opposite by taking them all away. The screen says: "Cheater - you don't deserve weapons!"|