BO6 really decided the finale didn’t need to make sense for even five minutes. 😂

1. ⚡ GET PACK-A-PUNCH ONLINE

Follow the map’s opening objectives down through the Janus Towers toward:

T2 SUBLEVEL 10.

Activate the Particle Accelerator and complete the crystal objective to restore the system and unlock access to Pack-a-Punch.

While opening the map, we’re going to start several Main Quest items early because Reckoning has a LOT of moving parts.

2. 💉 GRAB THE SYRINGE

Go to:

🧪 T1 MUTANT RESEARCH LAB.

Interact with the centrifuge.

Take:

💉 SYRINGE.

Hold onto it.

Now head back toward the Particle Accelerator in:

T2 SUBLEVEL 10.

3. 🧟 GET THE BLOOD SAMPLE

There’s a floating body above the Particle Accelerator.

Jump into the accelerator beam.

You’ll get launched into it and knock the body down.

Interact with the body using your Syringe to collect:

🩸 BLOOD SAMPLE.

Return to the Mutant Research Lab and put the Syringe back into the centrifuge.

And that produces…

4. 👹 FOWLER MANGLER

A special:

👹 FOWLER MANGLER

appears.

Defeat it.

It drops:

💉 FOWLER MUTANT INJECTION.

Take this to:

T2 DARK ENTITY CONTAINMENT.

Find the scanner beside the upper-floor door and use the Mutant Injection in front of it.

A portal opens into:

🌀 T2 TELEPORTATION LAB.

5. 🧬 GET THE DNA VIAL

After Pack-a-Punch has been activated, a special Geneticist Zombie can appear in the Mutant Research Lab.

It drops a:

🔑 KEYCARD.

Use the Keycard on the refrigerator in the:

T1 MUTANT RESEARCH TEST AREA.

Inside is:

🧬 DNA VIAL.

⚠️ DO NOT FORGET THIS.

You need the DNA Vial to enter the final encounter. Without it, Richtofen will prevent you from progressing through the finale portal.

6. 🤖 BUILD FRANKEN-KLAUS

Now we need:

🤖 FRANKEN-KLAUS.

Because regular Klaus apparently wasn’t German-science-project enough.

We need:

🦾 TWO ARMS

🦿 TWO LEGS.

The arms come from Kommando Klaus enemies during special rounds—shoot the arms off and collect them.

The legs are found around:

T2 ANDROID ASSEMBLY.

There are four possible leg spawn locations, and each leg occupies one of them.

7. 🧟‍♂️ ASSEMBLE FRANKEN-KLAUS

Find the hanging Klaus body in Android Assembly.

Attach:

🦾 Arm #1

🦾 Arm #2

🦿 Leg #1

🦿 Leg #2

But he’s still dead.

We need electricity.

And thankfully we have an enormous angry robot capable of providing some.

8. ⚡ USE UBER KLAUS

Wait for:

🤖 UBER KLAUS.

Lure him toward the hanging Franken-Klaus.

Get Uber Klaus to use his electrical ranged attack on the hanging body.

⚡ ZAP.

Franken-Klaus activates.

Franken-Klaus:

“I LIVE!”

Us:

“Excellent. Please hack this billion-dollar government facility.”

😂

9. 💻 LET FRANKEN-KLAUS WORK

Franken-Klaus begins working on the nearby terminal.

Advance a full round.

He moves into:

T2 DARK ENTITY CONTAINMENT.

There, he starts a:

🔴 S.A.M. TRIAL.

Complete the required eliminations.

Afterward, Franken-Klaus moves through the portal into:

T2 TELEPORTATION LAB.

Now he needs a password.

10. 📁 FIND FOUR PROJECT JANUS FOLDERS

There are four folders scattered among several possible locations in:

🏢 T1 Executive Suite

🏢 T1 Director’s Office

🌀 T2 Teleportation Lab.

Interact with each folder.

Every folder contains:

a number

and

a date.

Write both down.

11. 🔢 SOLVE THE FOUR-DIGIT CODE

Here’s the trick:

DON’T SORT THE NUMBERS.

Sort the:

📅 DATES.

Arrange your four folders from:

OLDEST → NEWEST.

Then take the number associated with each folder in that order.

Example only:

March → 7

June → 4

September → 2

December → 9

Your code would be:

7429.

Your numbers will vary.

Enter your four-digit code into the Teleportation Lab computer.

💻 JANUS SYSTEM HACKED.

12. 🧠 GET THE PROJECT JANUS BRAIN

Now we’re going to fix the portal.

First:

🥊 GET MELEE MACCHIATO.

Head into:

T1 QUANTUM COMPUTING CORE.

Find the Project Janus containment machine.

Punch it using Melee Macchiato.

It breaks open and reveals:

🧠 A BRAIN.

Pick it up.

Yep.

We’re carrying a brain across Janus Towers.

Completely normal Tuesday.

13. 🏃 DELIVER THE BRAIN

Take the brain to:

T2 TELEPORTATION LAB.

Place it inside the red-lit Project Janus containment unit beside Franken-Klaus.

The lights turn:

🟢 GREEN.

Be careful while carrying it because you can’t just freely fight as normal without risking dropping the quest item.

14. 👾 NOW WE NEED THE GORGOFEX

And here’s another HUGE part our original walkthrough didn’t explain correctly.

The Main Quest requires:

👾 GORGOFEX.

To start building it, return to:

T1 MUTANT RESEARCH LAB.

Check the static-filled monitors.

One or two monitors display words.

Take the:

FIRST LETTER

of each displayed word.

Those letters correspond to the chemical symbol of an element on the periodic table. That element’s atomic number is the code you need for the keypad at the Mutant Research Test Area.

Yes.

WE’RE DOING CHEMISTRY NOW.

First Terminus gave us algebra.

Reckoning:

“PERIODIC TABLE, BABY!”

😂

15. 🧪 OPEN THE BIOWEAPONS LAB

Enter the atomic-number code into the keypad above the vat containing Richtofen’s family.

This opens:

T1 BIOWEAPONS LAB.

Inside, locate the:

🫧 CYST.

Now feed it souls in a very specific order:

1️⃣ THREE VERMIN FIRST

2️⃣ THREE ZOMBIES SECOND.

Doing the zombies first can prevent the Cyst from fully charging.

Pick up the charged Cyst.

16. 🍄 ABSORB THREE AETHERIC FLORA

Carry the Cyst through:

T1 Quantum Computing Core

and

T1 Quantum Computing Lab.

Find:

🍄 THREE GLOWING AETHERIC FLORA.

Stand underneath each one while holding the Cyst.

The Cyst absorbs them.

After all three:

🫧 CYST FULLY CHARGED.

17. ⚡ INITIATE THE POWER SURGE

Head into:

T2 DARK ENTITY CONTAINMENT.

Find a terminal reading:

INITIATE POWER SURGE.

Activate it.

Another terminal changes to the same message.

Hit that one.

Then the next.

Continue rapidly until you’ve activated the entire sequence. If you’re too slow, the sequence resets and you retry.

When successful:

🤖 UBER KLAUS SPAWNS.

18. 👁️ LET THE FORSAKEN TAKE UBER KLAUS

Damage Uber Klaus enough to destroy the shield generators on his shoulders.

⚠️ DON’T ELIMINATE HIM.

Lure him onto the charged panel in front of:

👁️ THE FORSAKEN.

When everything is set correctly, the Forsaken transfers into Uber Klaus.

And now we’ve somehow combined:

Forsaken

Uber Klaus

because apparently nobody at Project Janus has ever heard the phrase:

“THIS IS A TERRIBLE IDEA.”

😂

19. 👾 CREATE THE GORGOFEX

Defeat the possessed Uber Klaus by destroying its exposed core.

Afterward, interact with the remaining essence.

It forms:

👾 GORGOFEX WONDER WEAPON.

The Gorgofex is required for later Main Quest steps. Its two optional upgrades—Corpsloder and Necrodystonia—are mutually exclusive, but neither upgrade is required to finish the quest.

20. 🔵 CREATE THE QUANTUM ORB

Go back to:

T2 SUBLEVEL 10.

Activate the red terminal.

Special:

🔵 QUANTUM VERMIN

spawn.

Eliminate them using the:

👾 GORGOFEX.

Once you’ve eliminated enough, a:

🔵 BLUE ORB

appears above the terminal.

Interact with it.

21. 💥 BREAK THE PORTAL CRYSTALS

Return to:

T2 TELEPORTATION LAB.

The portal is still blocked by crystals.

Charge a Gorgofex shot.

Fire it into:

💎 THE PORTAL CRYSTALS.

They break apart.

🌀 PORTAL UNBLOCKED.

But…

Still not usable.

OF COURSE NOT.

😂

22. 🍄 GET THE FUNGAL HEAD

Go to:

T1 QUANTUM COMPUTING CORE.

Look high on the wall opposite Melee Macchiato for a square opening.

Fire a charged Gorgofex shot into it.

Something falls out:

🍄 FUNGAL HEAD.

Pick it up.

23. 🪣 CLEAN THE FUNGAL HEAD

Remember the sprinkler system?

Find the:

🪣 MOP BUCKET

in either Project Janus Reception or Android Assembly.

Move it underneath the sprinkler.

Trigger the nearby smoke detector with an appropriate in-game explosive effect.

The sprinklers activate.

Water fills the bucket.

Put the:

🍄 FUNGAL HEAD

inside.

Now it’s cleaned.

This is officially the most important janitorial work in Call of Duty history.

24. 👻 CHARGE THE FUNGAL HEAD

Pick the cleaned head back up.

Now eliminate zombies while carrying it.

Their energy gets absorbed.

As it charges, a shadowy figure periodically appears and interferes with you.

Keep collecting souls until the head stops accepting them.

Then return to:

T2 TELEPORTATION LAB.

Place the charged Fungal Head into the center of the portal.

The fungus spreads around the frame.

🍄 PORTAL PREPARED.

25. 🌀 CAPTURE FOUR PURPLE OBJECTS

Blue Project Janus containers around the map are now open.

Inside are:

🌀 VACUUM-SEAL DEVICES.

You’ll also find obvious:

🟣 FLOATING PURPLE OBJECTS

around Janus Towers.

Use a Vacuum-Seal Device to capture one.

Each device is consumed when used.

You need:

FOUR CAPTURED OBJECTS.

There are more than four possible objects around the map, so you don’t need every location.

26. ⚡ POWER THE PORTAL

Take your:

🌀 FOUR FILLED VACUUM-SEAL DEVICES

back into the Teleportation Lab.

Insert them into the console.

🚨 LOCKDOWN.

Several switches around the room turn:

🔴 RED.

Interact with the active switches until they become:

🟢 GREEN.

The exact number varies with player count. Once they’re all green:

🌀 PORTAL STABILIZED.

⚠️ 27. POINT OF NO RETURN

STOP.

Do not enter yet.

Once you go through:

FINAL ENCOUNTER.

Make sure your important equipment, armor, perks and upgraded weapons are ready first.

And remember:

🧬 YOU NEED THE DNA VIAL.

Once everyone is prepared:

Enter.

28. 🌌 DARK AETHER ELEMENTS VAULT

You’re transported to:

T3 DARK AETHER ELEMENTS VAULT 1.

There are:

🧪 THREE L.T.G. CANISTERS.

Kill zombies close enough to each canister to charge it.

You’ll know they’re in range because their:

👁️ EYES TURN PURPLE.

Fill all three.

29. 💎 DESTROY THE AETHER CRYSTALS

Take the elevator to:

T3 DARK AETHER ELEMENTS VAULT 2.

Shoot all the:

💎 AETHER CRYSTALS.

Once they’re gone:

Get back onto the elevator.

Up we go.

To:

🌃 T3 ROOFTOPS.

And now…

30. ⚖️ THE CHOICE

Reckoning does something unusual:

YOU CHOOSE WHO TO HELP.

🔴 SIDE WITH RICHTOFEN

You fight:

👁️ S.A.M.

🟣 SIDE WITH S.A.M.

You fight:

🤖 UBER RICHTOFEN.

Your choice changes the boss and a short scene associated with the ending, although the ultimate final cinematic converges afterward.

So we’re covering:

BOTH BOSSES.

🔴 ROUTE A — FIGHT S.A.M.

S.A.M. attacks using:

🟣 Rapid purple eye beams

🔴 A huge sweeping laser

⚡ Rotating electrical projectiles.

Stay mobile and use the arena’s cover.

After certain attacks, four glowing weak points around her central eye become vulnerable. Destroy them and the:

👁️ CENTER EYE

becomes the main damage target.

31A. 🧪 S.A.M. TRIAL INTERMISSIONS

After enough damage:

S.A.M. disappears.

A Max Ammo appears.

Then:

🔴 S.A.M. TRIAL.

Do as well as possible during these challenges. Higher performance can grant useful rewards, while poor performance can cause Griefs such as ammo or weapon penalties that make later phases harder.

Then S.A.M. returns.

Repeat:

Avoid attacks → expose weak points → damage eye → Trial → repeat.

Eventually—

💥 S.A.M. DEFEATED.

🟣 ROUTE B — UBER RICHTOFEN

If you side with S.A.M., Richtofen isn’t exactly thrilled.

He becomes:

🤖 UBER RICHTOFEN.

During the first phase, his important weak points are:

🎯 SHOULDERS.

Break them.

That exposes:

🎯 CORE.

Meanwhile, regular zombies plus Kommando Klaus and other Klaus enemies can join the fight, making the arena much busier.

31B. 🚀 RICHTOFEN PHASE TWO

After enough damage…

🚀 JETPACK.

Because why wouldn’t Richtofen have a jetpack?

He becomes extremely mobile and begins flying around the arena while using:

⚡ WUNDERWAFFE DG-2.

He can also bombard sections of the arena from above.

This phase is less about constantly chasing him and more about surviving his attack cycle and taking damage opportunities when he returns closer to the ground.

Eventually his:

🚀 JETPACK

becomes your major damage target.

Keep surviving his cycles and attacking during safe openings.

Until—

💥 UBER RICHTOFEN DEFEATED.

🎬 32. THE END

Whichever route you chose:

Defeat S.A.M.

Defeat Uber Richtofen.

You’ll get the route-specific sequence, followed by the ending cinematic.

And with that:

🏆 RECKONING MAIN QUEST — COMPLETE.