⏰ “Okay, we messed around with space. Nothing bad could happen with time, right?”

…

RIGHT?!

😭

1. ⏳ UNDERSTAND THE TWO TIMELINES

Paradox Junction contains two versions of Nuketown:

☀️ NORMAL NUKETOWN

The intact, pre-destruction version.

☢️ DESTROYED NUKETOWN

The ruined version.

Finishing a Rad-Hound round automatically flips you into the opposite timeline, and after progressing far enough you can also use the Temporal Conduits to move between them. Many quest puzzles deliberately require doing something in one timeline and checking the same physical location in the other.

This will become important approximately…

EVERY FIVE MINUTES. 😂

2. 🔑 GET THE TRUCK KEYS

Start in Normal Nuketown.

Go behind the:

🟡 YELLOW HOUSE.

Near the wooden fence is a body.

Pick up:

🔑 TRUCK KEYS.

Progress until the temporal event moves you between timelines.

The keys are needed to deal with the truck blocking your route toward the rest of Nuketown.

3. 🌪️ UNLOCK PACK-A-PUNCH

Once you’ve reached the other side and moved the obstructing truck, you’ll encounter the Temporal Storm around Trinity Avenue.

There are:

🟡 FOUR SPACE-TIME KNOTS.

Complete the encounters associated with all four.

When all four knots are disrupted, the Temporal Storm clears and:

🔧 PACK-A-PUNCH

becomes permanently available on Trinity Avenue.

Now the actual insanity begins.

4. 🌌 BUILD THE BLUNDERGAT — FOUR PARTS

We need:

🛢️ Barrel
🔨 Hammer
🪵 Stock
🧴 Sealant

And THIS is a perfect example of why our first guide needed more detail.

Each part has its own puzzle.

5. 🛢️ BARREL — FIND THE CORRECT LOOT CYST

Go to:

☢️ DESTROYED NUKETOWN.

There are several Loot Cysts attached to walls around the houses.

Walk near them.

One produces a distinctive:

👂 ETHEREAL SOUND.

That’s your target.

Eliminate zombies near that Cyst to feed it souls.

Eventually:

💥 CYST BURSTS.

Collect:

🛢️ BLUNDERGAT BARREL.

6. 🔨 HAMMER — CHEMISTRY RETURNS

Oh no.

Not again.

Go upstairs in the:

☢️ DESTROYED YELLOW HOUSE.

Pick up:

🧪 SO₃.

Take it into the Destroyed Green House kitchen.

Interact with the water-filled sink.

That converts it into:

🧪 H₂SO₄.

Sulfuric acid.

Terminus gave us algebra.

Reckoning gave us the periodic table.

Paradox Junction:

“HOPE YOU PAID ATTENTION IN CHEMISTRY.”

😂

7. 👤 FIND THE CORRECT MANNEQUIN

Still in Destroyed Nuketown:

Walk near the mannequins.

You’re listening for another:

👂 ETHEREAL SOUND.

Remember exactly which mannequin produces it.

Now switch to:

☀️ NORMAL NUKETOWN.

Find the same mannequin in the same location.

Interact with it to apply the acid.

Then return to:

☢️ DESTROYED NUKETOWN.

That mannequin is now dissolved and reveals:

🔨 HAMMER.

Grab it.

⚠️ BUG NOTE

The detailed guide reports that the sound cue can sometimes fail. If that happens, the workaround is checking the mannequins manually by applying/refilling the acid until you find the correct one.

8. 🪵 STOCK — THREE BLACK GROWTHS

In Destroyed Nuketown, check these three locations:

🟡 Yellow House Garage

🟢 Green House stairs — right side

🏘️ Trinity Avenue alley — right wall.

One black growth produces the:

👂 ETHEREAL SOUND.

Remember which one.

Now travel to:

☀️ NORMAL NUKETOWN.

Go to the exact corresponding wall and use the required in-game explosive interaction to open it.

Return to:

☢️ DESTROYED NUKETOWN.

The wall is now exposed.

Collect:

🪵 STOCK.

9. 🧴 SEALANT — FINALLY, SOMETHING EASY

Go to:

☀️ NORMAL YELLOW HOUSE — UPSTAIRS BEDROOM.

Check the shelf.

Bottom-left corner:

🧴 SEALANT.

Pick it up.

That’s it.

No alternate dimension.

No chemistry.

No ghost mannequin.

THANK YOU, TREYARCH. 😂

10. 🌌 ASSEMBLE THE BLUNDERGAT

Return to:

☢️ DESTROYED NUKETOWN.

Open the truck in the Cul-de-Sac.

Inside is the workbench.

Interact with it and install:

Barrel + Hammer + Stock + Sealant.

Complete the assembly and claim:

🌌 BLUNDERGAT.

But don’t get comfortable.

We immediately upgrade it.

11. 🔥 FIND THE FIRE TORNADO

Progress rounds in:

☢️ DESTROYED NUKETOWN.

Eventually a:

🌪️🔥 FIRE TORNADO

appears at one of three locations:

Yellow House Backyard

Green House Backyard

Trinity Avenue alley.

Approaching it releases a:

🔥 TORTURED ZOMBIE.

12. 🧟 ESCORT THE TORTURED ZOMBIE

Here’s the part that matters:

❌ DON’T LET THE OTHER ZOMBIES GET IT.

Other zombies attack the Tortured Zombie.

Clear enemies around it while leading it toward:

🚚 THE BLUNDERGAT WORKBENCH.

Once the Tortured Zombie is directly in front of the workbench, complete its required Blundergat elimination.

That’s:

1/3.

13. 🔥 DO IT THREE TIMES

Repeat on later rounds.

Second:

🔥 TORTURED ZOMBIE.

Same process.

Third encounter:

⚡ TORTURED SHOCK MIMIC.

Complete all three at the workbench.

Now go to:

☀️ NORMAL NUKETOWN.

Interact with the corresponding workbench and place the Blundergat into it.

Return to:

☢️ DESTROYED NUKETOWN.

Interact with the workbench again.

🌌⚡ SUNDERGAT ACQUIRED.

The in-game name is the Holistic Dichotomizer, but I’m going to continue calling it Sundergat because I enjoy retaining my sanity. 😂

14. 🛝 BUILD THE TWINS’ SWING

Before starting, it’s safest to have all relevant doors opened in both timelines.

Go to:

☀️ NORMAL YELLOW HOUSE BACKYARD.

Knock the wooden swing seat loose and pick it up.

Now switch to:

☢️ DESTROYED NUKETOWN.

We need an:

🎮 RC-XD CONTROLLER.

It has three possible locations:

Trinity Avenue — against crates right of Pack-a-Punch

Green House Backyard — garden/fence

Yellow House Garage — broken shelf.

15. 🎮 COMPLETE THE RC-XD COURSE

Interact with the controller.

You’re now controlling the RC-XD.

Follow the marked route.

Near the end:

⚠️ DON’T WORRY ABOUT BOOSTING.

The important part is timing the final ramp correctly.

Jump over the barriers and land inside the garage.

Reach the barrel/garage-door objective and complete the RC-XD sequence.

💥 GARAGE OPEN.

16. 🖍️ GET THE CHALK

Enter the newly opened garage.

Wait a few seconds.

The stone figure disappears.

On the floor where it stood:

🖍️ CHALK.

Grab it.

Return to the Yellow House Backyard, put the swing seat back onto the swing, then place the Chalk.

A mini-cutscene begins.

👧👧 THE TWINS APPEAR.

And from this point forward, the Easter Egg becomes:

“PLAY CHILDREN’S GAMES OR DIE.”

Fantastic. 😂

17. 🌱 GET THE IRRADIATED SEEDS

Go to:

☢️ DESTROYED YELLOW HOUSE GARAGE.

On the shelf beside the trap switch is a:

🧰 RED TOOLBOX.

Open it.

Collect:

🌱 IRRADIATED SEEDS.

Switch to:

☀️ NORMAL NUKETOWN.

Go to Trinity Avenue, left of Pack-a-Punch.

Plant the seeds in the dug-up patch.

18. 🌳 GROW THE STRANGE TREE

The young tree is essentially a soul container.

Fill it using the quest’s Blundergat-family requirement until:

⚪ SCREEN FLASH

📦 MAX AMMO

confirms completion.

Now switch to:

☢️ DESTROYED NUKETOWN.

At the same location is a fully grown tree.

Use:

🪓 THREE COMBAT AXE HITS

on the tree.

It drops:

🪵 THREE STRANGE FIREWOOD PIECES.

19. 🔥 LIGHT THE FIREPLACE

Return to:

☀️ NORMAL YELLOW HOUSE.

Put all three Strange Firewood pieces into the fireplace.

Use the quest’s fire interaction to ignite them.

🔥 FIREPLACE ACTIVE.

20. ❌ FIND THE FIRST X

Switch to:

☢️ DESTROYED NUKETOWN.

Go to Trinity Avenue in front of the alley.

There’s now a:

❌ WHITE X.

Stand directly on it.

Wait.

It begins glowing:

🔵 BLUE.

Don’t leave until it stays blue after you step off.

21. 🟦 HOPSCOTCH — ACTUAL SOLUTION

Switch to the same spot in:

☀️ NORMAL NUKETOWN.

The Twins draw:

🟦 HOPSCOTCH.

Interact with the glowing orb above:

1.

The game switches to third person.

Here’s the actual objective:

GO FROM 1 → 12 → BACK TO 1.

You must land only on the valid hopscotch spaces while avoiding the moving:

⚫ SHADOW.

If the shadow touches you—or you touch an invalid area—you fail.

The orb respawns after roughly 30 seconds, so you can retry without restarting the quest.

22. 🎵 ESCORT THE MUSIC BOX

Win Hopscotch.

A golden:

🎵 MUSIC BOX

appears.

Feed it souls using the Sundergat near it.

As it fills, it moves toward:

🔥 YELLOW HOUSE FIREPLACE.

Keep repeating the soul-fill process along its path.

When it reaches the fireplace:

⚪ SCREEN FLASH

📦 MAX AMMO.

🎵 MUSIC BOX COMPLETE.

23. 🎹 SPAWN THE PIANO TEACHER

Now go to:

☢️ DESTROYED GREEN HOUSE BACKYARD.

This needs to be during a normal zombie round, not a Rad-Hound round.

Stay in the backyard for about:

⏱️ 60 SECONDS.

Eventually a slower special zombie appears:

🎹 PIANO TEACHER.

Use the quest’s required Brain Rot or Psych Grenade interaction to turn her.

She runs toward the piano inside the Green House.

Then quickly switch to:

☀️ NORMAL NUKETOWN.

She activates the piano.

⚠️ DON’T GRAB A NUKE

A Nuke while she’s active can despawn her.

24. 🎼 FIND ALL EIGHT BLUE NOTES

Return to:

☢️ DESTROYED NUKETOWN.

Eight glowing blue notes appear.

Their locations are:

1. Green House Backyard — left side of bunker

2. Yellow House Backyard — garden fence

3. Cul-de-Sac — yellow bus

4. Cul-de-Sac — fence right of teleporter

5. Trinity Avenue — garage door left of alley

6. Trinity Avenue — brick wall left of M8A1 wall-buy

7. Trinity Avenue — rock left of Pack-a-Punch near Strange Tree

8. Trinity Avenue — broken fence right of Exfil phone.

Each note flashes between one and eight times, identifying its position in the musical sequence.

You need to interact with all eight to progress.

25. 🎹 THE ACTUAL PIANO SOLUTION

THIS was exactly the sort of thing our previous guide summarized instead of actually giving you.

Go to the activated piano in:

☀️ NORMAL NUKETOWN.

The piano has eight selectable keys numbered:

1 2 3 4 5 6 7 8

from left to right.

The solution is fixed.

Enter:

🎹 8 → 6 → 7 → 5 → 6 → 5 → 3 → 5

Musically, that’s:

A → F → G → E → F → E → C → E.

The numerical code does not change between matches.

If you mess it up, wait about a minute for the piano to reset and enter the same sequence again.

FINALLY.

No:

“Solve the music puzzle.”

No:

“Match the notes.”

The answer is:

86756535.

😂

26. 👻 FREE THREE FLOATING SOULS

After completing the piano:

Return to:

☢️ DESTROYED NUKETOWN.

Check outside the playable boundaries around the:

Green House Backyard

and

Yellow House Backyard.

There are:

👻 THREE FLOATING ZOMBIES TOTAL.

Interact with the quest targets to release all three souls. They can be split between both backyards.

27. 🏐 PLAY THE BOUNCING-BALL GAME

Return to:

☀️ NORMAL TRINITY AVENUE.

The Twins draw a circle in the road.

Interact with the glowing ball.

The ball starts bouncing and launches zombies into the air.

Your objective:

STOP EVERY TARGET FROM HITTING THE GROUND.

Complete the minigame.

A glowing:

🎼 MUSIC SHEET

appears.

28. 🎼 ESCORT THE MUSIC SHEET

Same principle as the Music Box.

Feed souls near the Music Sheet with:

🌌 SUNDERGAT.

The Music Sheet gradually moves toward:

🎹 GREEN HOUSE PIANO.

Continue until it reaches the piano.

Screen flash.

Max Ammo.

🎼 MUSIC SHEET COMPLETE.

29. 🥽 GET THE GOGGLES

Go to:

☢️ DESTROYED TRINITY AVENUE.

Left of Pack-a-Punch is a pole covered in speakers.

Important:

DON’T TARGET THE SPEAKERS.

Hit the:

VERY TOP OF THE POLE.

The Goggles fall outside the playable area.

Now activate:

✨ WISP TEA.

Your Wisp retrieves them.

Collect:

🥽 GOGGLES.

30. 🎧 FIND THE HEADSET

You need:

👁️ DEATH PERCEPTION.

With it active, search for the Headset outline at one of three possible locations:

🟢 Green House upstairs

Inside the wall connecting the two rooms.

🗑️ Cul-de-Sac

Inside the trash can left of the GobbleGum machine.

🟡 Yellow House Backyard

In the mannequin’s hand left of the Perk machine.

Interact with the outline.

🎧 HEADSET ACQUIRED.

31. 🧸 PUT THEM IN THE TOY BOX

Go to:

☀️ NORMAL TRINITY AVENUE.

Put:

🥽 Goggles

and

🎧 Headset

into the:

🧸 TOY BOX.

Now switch back to:

☢️ DESTROYED NUKETOWN.

Go into the Green House Backyard.

Another:

❌ X

appears.

32. 🔴 FIND THE RED BALL

The red ball has three possible locations:

🏠 Trinity Avenue

On the roof above the M8A1 wall-buy.

📦 Trinity Avenue

On top of the munitions boxes left of the alley.

🟡 Yellow House Backyard

On top of the patio pillar.

Once you’ve found it, use the quest interaction to knock it down and keep moving it until it reaches:

❌ THE X IN GREEN HOUSE BACKYARD.

When centered correctly:

🔵 X TURNS BLUE.

33. 🟥🟦 FOUR-SQUARE — ACTUAL RULE

Switch to:

☀️ NORMAL NUKETOWN.

The Twins draw:

FOUR-SQUARE.

Interact with the ball.

Here’s the actual rule:

❌ THE BALL CANNOT BOUNCE IN THE SAME SQUARE TWICE IN A ROW.

Use melee interactions to knock the ball between squares.

You don’t need some hidden numerical pattern.

You simply need:

Square A → different square → different square → etc.

Keep the ball from making consecutive bounces in one square until the timer expires.

Fail?

Short cooldown.

Try again.

34. 🥁 ESCORT THE CYMBALS

Winning Four-Square produces:

🥁 CYMBALS.

Feed souls near them with:

🌌 SUNDERGAT.

The Cymbals travel toward:

🧸 TOY BOX — TRINITY AVENUE.

Keep filling them until they reach it.

Screen flash.

Max Ammo.

🥁 CYMBALS COMPLETE.

35. 🕰️ THE CLOCK PUZZLE — ACTUAL SOLUTION

And here’s another one I didn’t spell out properly last time.

Go to:

☢️ DESTROYED NUKETOWN.

Look at the Clock Tower.

It has:

🔴 RED HAND

⚪ WHITE HAND.

Adjust them until:

🔴 RED = 0

⚪ WHITE = 0.

Now initiate the teleport into:

☀️ NORMAL NUKETOWN.

But—

⚠️ WATCH THE TELEPORT ANIMATION.

Just before the teleport completes:

HIT THE RED CLOCK HAND ONCE.

If your timing is correct:

⚪ WHITE ORB APPEARS.

So the solution is:

0 / 0 → initiate teleport → RED HAND +1 during transition.

That’s the missing detail we needed.

36. 👧👧 FOLLOW THE TWINS

Follow the white orb.

It transforms into the Twins and takes you through the quest objects you’ve restored:

🎹 Piano

→

🧸 Toy Box

→

🔥 Fireplace

→

🛝 Swing Set.

At the Yellow House Backyard:

🟡 FINAL PORTAL APPEARS.

⚠️ 37. POINT OF NO RETURN

STOP.

That yellow portal starts the:

🖤 DARK HEART BOSS FIGHT.

Make sure you’re ready before entering.

Once prepared:

ENTER THE PORTAL.

🖤 38. THE DARK HEART — PHASE ONE

The arena is essentially Nuketown with the gigantic:

🖤 DARK HEART

above you.

There are three patches of black goo:

🏘️ Trinity Avenue

🟡 Yellow House Backyard

🟢 Green House Backyard.

Each has a:

🫧 LOOT CYST.

Fill each Cyst with nearby zombie souls.

When a Cyst bursts, it reveals one of the important quest artifacts you’ve been restoring.

🔵 39. DEFEND THE THREE CONCENTRATION FIELDS

After all three Cysts are opened:

🔵 CONCENTRATION FIELD

appears around one of the artifacts.

Protect it from zombies.

If its health reaches zero, you’ve failed that defense.

Complete the defense at:

ALL THREE ARTIFACTS.

Then:

🖤 DARK HEART BECOMES VULNERABLE.

🎯 40. DAMAGE PHASE ONE

The Dark Heart starts spinning.

Glowing vulnerable points appear around it.

Damage those points while avoiding its:

☄️ METEORS

and

🌪️🔥 FIRE TORNADOES.

You don’t have to stand directly underneath the Heart—the weak points can be damaged from elsewhere on the map when you have a clear angle.

Destroy all exposed weak points.

PHASE ONE COMPLETE.

🟡 41. DARK HEART — PHASE TWO

The three black-goo locations return.

But this time:

❌ NO LOOT CYST SOUL BOXES.

Instead, each goo patch has:

🟡 A YELLOW ORB.

The orb summons zombies underneath it.

Clear the spawned group.

Do that at:

Trinity Avenue

Yellow House Backyard

Green House Backyard.

Then once again:

🔵 DEFEND ALL THREE CONCENTRATION FIELDS.

🖤 42. DAMAGE PHASE TWO

Dark Heart becomes vulnerable again.

This time it spins more aggressively, while additional:

☢️ RAD-HOUNDS

make the damage phase considerably more chaotic.

Clear the Rad-Hounds if they’re overwhelming you, then hit the Heart’s glowing weak points.

Destroy them all.

PHASE TWO COMPLETE.

🔥 43. DARK HEART — PHASE THREE

Remember those Tortured Zombies from the Sundergat upgrade?

THEY’RE BACK.

🌪️🔥 FIRE TORNADO

appears with a Tortured Zombie.

You must escort that Tortured Zombie to:

ONE OF THE THREE BLACK-GOO LOCATIONS.

Keep the other zombies away from it.

When the Tortured Zombie reaches the goo, you’ll see it:

🟣 TETHER TO THE GOO.

That’s your confirmation.

Complete the required Sundergat interaction on the Tortured Zombie.

The artifact activates.

44. 🔥 DO IT AT ALL THREE ARTIFACTS

Repeat:

Protect Tortured Zombie

→ Escort to black goo

→ Wait for tether

→ Complete Sundergat requirement

at all:

THREE GOO LOCATIONS.

Shock Mimics and near-constant Rad-Hounds are now joining the fight too.

So Phase Three is essentially:

EVERYTHING IS ON FIRE AND EVERYONE IS ANGRY.

😂

🔵 45. FINAL CONCENTRATION DEFENSE

Once all three artifacts are active:

Protect their:

🔵 CONCENTRATION FIELDS

one final time.

Clear the enemies trying to break them.

Finish all three.

And now—

🖤 DARK HEART VULNERABLE.

💥 46. FINAL DAMAGE PHASE

This is the nastiest damage phase because:

🖤 THE DARK HEART KEEPS SPINNING.

Its attacks haven’t fundamentally changed, but hitting the glowing vulnerable sections becomes harder while enemies continue pressuring you.

Stay alive.

Wait for clear angles.

Hit the exposed weak points.

One by one:

💥 CRACK.

Until—

💥💥💥

🖤 DARK HEART DESTROYED.

Ending cutscene.

🏆 PARADOX JUNCTION COMPLETE.