gameDOOM Eternalguide
Cheat Codes and Secrets
Floppy-disk cheat locations, classic DOOM, the secret Unmaykr and Mastery farming.
1.Cheat Codes
Find the floppy-disk collectible in the given mission; cheat codes can be activated after completing a mission, from the Mission Select menu at the Fortress Of Doom. Cheats don't lock progression but disable Slayer Gates.
| Code / Content | Location and effect |
|---|---|
| IDDQD | Mission 3 Cultist Base — Sentinel Armor |
| IDKFA | Mission 6 Arc Complex — all weapons and equipment |
| Infinite Ammo | Mission 5 Super Gore Nest — infinite ammo |
| Infinite Extra Lives | Mission 1 Hell On Earth — infinite extra lives |
| Fully Upgraded Suit | Fortress Of Doom, Power Room — all Praetor Perks |
| All Runes | Fortress Of Doom, right tower — all Runes |
| Famine Mode | Mission 10 Nekravol — enemies drop no armor/health |
| Instant Stagger Mode | Mission 11 Nekravol II — damage/dash instantly staggers |
| Silver Bullet Mode | Mission 4 Doom Hunter Base — instantly kills staggered enemies |
| Party / Quakecon / Power-Up (Berzerk/Onslaught/Overdrive) Mode | Visual/fun and infinite power-up modes |
2.Classic DOOM and Unmaykr
- Classic DOOM: Complete the DOOM Eternal campaign; play the original DOOM from the computer in Doomguy's room.
- Classic DOOM 2: On the same computer, enter
FLYNNTAGGARTas a code. - Secret Unmaykr: Collect the six Empyrean Keys from the six Slayer Gates in Missions 2, 3, 5, 6, 7, 9; in the Fortress Of Doom's center chamber drop to the lowest level and grab the Unmaykr. It uses BFG ammo and sprays lasers in a wide arc.
3.Easy Mastery Challenges
Once a Mastery Challenge is unlocked: go to an arena with plenty of the required enemy type (e.g. an Arachnotron in Mission 1), raise the challenge meter by +1, then pause > Load Checkpoint — your ammo refreshes but progress is kept. Repeat.