Heretic
While playing the game, enter one of the following codes to activate the corresponding cheat function:
| Result | Cheat Code |
| Invincibility | quicken |
| All weapons and ammo | rambo |
| All skeleton keys | ravskel |
| Walk through walls | kitty |
| Level select | engage[episode number][level number] |
| Deathmatch level | engage41 |
| Full health | ponce |
| Toggle power-up mode | shazam |
| Killl all monsters in level | massacre |
| Chicken mode | cockadooledoo |
| Changes map mode | ravmap (at map screen) |
| [F1] creates screenshot | ravpic (at title screen) |
| Ring of Invulnerability | gimmea |
| Shadowsphere | gimmeb |
| Quartz Flask | gimmec |
| Mystic Urn | gimmed |
| Tome of Power | gimmee |
| Torch | gimmef |
| Time Bomb of the Ancients | gimmeg |
| Morph Ovum | gimmeh |
| Wings of Wrath | gimmei |
| Chaos device | gimmej |
| Sound debug | noise |
| Ticks-per-frame counter | ticker |
| Instant death | iddqd |
| No weapons and ammo | idkfa |
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