How to solve the Doppelghast code in Black Ops 6 Zombies

The Shattered Veil map in Black Ops 6 Zombies is filled with intricate Easter Eggs and hidden quests, one of which involves unlocking a mysterious Doppelghast trapped behind a glass door. This creature is tied to the Ray Gun Mark II Main Quest, and solving its puzzle requires deciphering a unique code based on one of three codenames: Yeti, Crab, or Moth.
If you’ve been struggling to crack this puzzle, fear not—this guide will walk you through every step, from obtaining the Floppy Disk to defeating the Doppelghast and securing the Shattered Arm, a crucial item for advancing the questline.

Step 1: Locating the Floppy Disk

Before you can unlock the Doppelghast door, you must first acquire the Floppy Disk, which contains the initial clue needed to proceed.

• Where to Find It:
  • Around Round 11, a special lab coat zombie will spawn, typically in the underground Mainframe Chamber (where S.A.M. is located).
  • Eliminate this zombie to obtain the Floppy Disk.
• Alternative Spawns:
  • If the lab coat zombie doesn’t appear by Round 11, continue progressing through rounds—it should eventually spawn.
  • Some players report encountering it near other high-traffic areas, so keep an eye out for unique zombie models.

Step 2: Retrieving the "Project Janus" Fax

Once you have the Floppy Disk, the next step is to retrieve a hidden fax containing one of three codewords: Yeti, Crab, or Moth.

• Location:
  • Head to the East Foyer (Stamin-Up room) and locate the fax machine at coordinates F3.
  • Interact with the machine to receive a printout labeled "Project Janus."
• Possible Issues & Fixes:
  • If the fax doesn’t appear immediately, trigger the next round by killing the last zombie.
  • Some players report needing to interact multiple times—ensure you’re standing directly in front of the machine.
• Memorize Your Codeword:
  • The fax will display one of the three words: Yeti, Crab, or Moth.
  • This word is random per playthrough, so don’t rely on other players’ solutions—yours will be different.

Step 3: Solving the Codename Puzzle in the Nursery

With your codeword in hand, you must now decipher its numerical counterpart using a chalkboard in the Nursery.

• Nursery Location:
  • Found at coordinates D3, near the PhD Flopper perk machine.
  • Inside, you’ll see a chalkboard covered in letters grouped in various sections.
• How the Puzzle Works:
  • The letters on the chalkboard are randomized each game, meaning the solution differs every time.
  • Your goal is to translate each letter of your codeword into a number based on its grouping.
• Decoding the Letters:
• Identify each letter of your codeword (e.g., C-R-A-B if your word is "Crab").
• Locate these letters on the chalkboard—they will be clustered with other letters in small groups.
• For each letter, count how many other letters are in its subgroup.
  • Example: If "C" is grouped with 9 other letters, its corresponding number is 9.
  • Repeat this for all letters in your word.
• Example Solution:
  • If your codeword is "Crab" and the groupings are:
    • C = 9 letters
    • R = 7 letters
    • A = 2 letters
    • B = 9 letters
  • Your final code would be 9729.

• Important Notes:
  • The words "Yeti," "Crab," and "Moth" are fixed, but the numbers change per game.
  • If you make a mistake, you can recheck the chalkboard—the groupings remain the same until the next game.

Step 4: Unlocking the Doppelghast Door

Now that you have your 4-digit code, it’s time to unlock the Doppelghast’s chamber.

• Location:
  • Head to the Service Tunnel at coordinates E4 (the same area where you first met S.A.M. for Pack-a-Punch).
  • The door requires Essence to open—ensure you have enough before proceeding.
• Inputting the Code:
  • Approach the keypad on the right side of the door.
  • Enter the 4-digit code you derived from the Nursery puzzle.
  • If correct, the door will open, revealing the Doppelghast.

Step 5: Defeating the Doppelghast & Obtaining the Shattered Arm

The Doppelghast is a formidable enemy, so prepare accordingly before engaging.

• Combat Tips:
  • Use high-damage weapons (Packed Wonder Weapons or LMGs work well).
  • Stay mobile—the Doppelghast has powerful melee attacks.
  • If overwhelmed, retreat to a more open area to avoid getting trapped.
• Reward: The Shattered Arm
  • Once defeated, interact with its downed body to collect the Shattered Arm.
  • This item is essential for progressing in the Ray Gun Mark II Main Quest, so don’t lose it!

Final Thoughts

The Doppelghast puzzle in BO6 Zombies Shattered Veil is a clever mix of exploration, decoding, and combat. By following these steps—securing the Floppy Disk, decoding your unique word in the Nursery, and inputting the correct door code—you’ll unlock a critical path toward obtaining the Ray Gun Mark II.

Have you encountered any variations or additional secrets in this quest? Share your experiences in the comments below!

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