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Call of Duty: Black Ops Cold War

How to complete Mauer der Toten Main Quest Easter Egg in Cold War Zombies

Our detailed guide will show you how to complete the full Easter Egg quest for Cold War’s Mauer Der Toten Zombies map.

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cold war mauer der toten disciple

Season 5’s Mauer der Toten map has a tricky and convoluted Easter Egg to complete in Cold War, and our guide will take you through step-by-step to complete this exciting Zombies quest.

As well as trying to survive as many rounds as possible in Mauer der Toten, there are extra objectives and activities for players to be getting on with.

Some searching needs to be done to rebuild the German robot Klaus, players need to find numbers and other items to get the powerful CRBR-S Wonder Weapon, and of course, there’s the main Easter Egg quest to complete.

We’ve put together a full guide on what to do and where you’ll need to go to do the Mauer der Toten Easter Egg in Black Ops Cold War Zombies.

Mauer der Toten Easter Egg guide

mule kick perk machine in cold war zombies

Strap yourself in as there are typically going to be many steps that comprise this tough and testing quest in Mauer der Toten.

Follow each step carefully, and you should have no problem doing this yourself.

1. Build Klaus

klaus robot in mauer der toten

As we mentioned earlier, one of the fun side activities that players can do as they play Cold War’s Mauer der Toten is build Klaus. He is a sassy robot that will assist the players in the lobby by shooting enemies and reviving any downed players.

But before any of this, you’ll need to scour the map and complete certain steps to assemble him. Check out our in-depth guide on how to build Klaus in Mauer der Toten to complete this first step.

2. Obtain the CRBR-S Wonder Weapon

crbr-s wonder weapon

Now that you have Klaus raring and ready to go, it’s time to use him to obtain the combination to the safe in the room you found his hands.

Once again, this asks you to complete a few different fiddly tasks to get the insanely powerful Wonder Weapon, and we’ve simplified the process with our how to get the CRBR-S Wonder Weapon guide here.

3. The Sewers Wall

secret lab wall in mauer der toten

With Klaus built and the CRBR-S in your hands, we can now press forward to the next crucial stages of the quest.

You’ll need to head underground and access the “Sewer Access” room. In here, select the wall in the picture, and in the same way, you’ve had Klaus smash open the locker to retrieve the black light, Klaus will actually obliterate the wall.

Behind this wall is another reinforced wall, and to get past that one, you’ll need to keep killing Zombies until one drops the “Blazer Mod kit” for the CRBR-S.

Equip the mod, and then proceed to unleash hell on that wall until it melts a hole through it, then enter through it.

4. The Secret Lab

cod zombie secret lab cold war

You’re now inside the lab that the main action will take place in, and the first course of action is to keep playing until the red shields protecting two pieces of equipment go away.

Next, pick up the three canisters in the middle platform that were protected by the shield, and kill some Zombies with the CRBR-S. Make your way over to the other device that was being shielded, and then claim the ‘Endstation Lure.’

5. Search Mauer der Toten for the Essence Harvesters

essence canister in mauer der toten

It’s now time to venture back out into the map and start finding Essence Harvesters, and there are three in total.

Once you arrive at once, activate it by placing an empty canister in the machine, and throw the Essence Trap on the ground. This will spawn Tempests, kill them, and then collect the now full Essence Canister.

The tricky part comes next as you’ll have to carry the canister all the way back to the Secret Lab and not allow it to become damaged. Once there, place it in the platform that you took the canister from originally, grab another trap, and then rinse and repeat with the remaining two Harvesters.

6. Upgrade Klaus

klaus in his upgrade station

We’re leaving the Secret Lab again, and it’s now time to upgrade Klaus. To do that, you need to keep spawning Klaus in after he’s recharged. Either approach him in his chair or find radios scattered around the map.

The goal is to let Klaus rack up enough kills so that the screens on the ‘Garment Factory’ stand turn green. Once it does this, command Klaus to get into the unit, and you will then have to defend him for a full minute.

Upon successful completion, you now need to head into the underground and go to the train tracks. He will comment that he will stop one of the trains, and then you need to go inside to the ‘Switch Control Room’ nearby and trigger the Railway Switch.

7. The Train

klaus stopping the mauer der toten train

Head back to the platform to observe Klaus as he miraculously brings one of the trains to a halt. Now is your chance to board the train, grab the ‘Bomb” and ‘Rico’s Keycard.’ With both of these items claimed, it’s time for another trip to the Secret Lab.

As soon as you’re inside, place the newly-acquired bomb into the cradle holding the three filled canisters. From there, it’s another journey, this time to the room you can find Klaus recharging in his chair.

In this room is a computer with the words “Keycard Required” displayed on the monitor. Insert said Keycard and select ‘Browse The Files.’

The objective is still not complete as you now want to make Klaus’ headgear.

8. Klaus’ headgear

Klaus with headgear in Mauer der toten

From the computer, you’ll now have to trek all the way to the beginning of the game on the rooftop where you originally spawned. If you look up, you will see a mini-pylon that you need to shoot the top off with the CRBR-S.

An item will then fall off of it, and it will be an ‘Antenna’ for you to pick up. Next, arrive at the ‘Electronics Store’ and shoot all the radios inside the shop – collecting the ‘Transistor’ in the process.

Finally, head back down to the ‘Ghost Station,’ and you’ll see a power box above the ticket booth to allow yourself to claim the ‘Electronic Boards.’

With everything in your possession, return to Klaus’ chair and press to ‘Craft Hacking Helm.’ Access the computer once more, and this time Klaus will give us access to the satellite.

9. Activate the Satellites

satellites in mauer der toten

Our first one is in the room with Klaus, just press to ‘Activate the Disruptor Satellite’ on the computer that required the Keycard, and that will be the first one done.

Onto the next one, and we can find it in “West Berlin Street” in a green tent next to the Trial Station. The final one can be located in ‘East Berlin Streets’ and is similarly tucked away in a green tent.

10. The Boss Rush + Radioactive Materials

piece of uranium rock in mauer der toten

Just when you think things couldn’t get any more strenuous, head to ‘Checkpoint Charlie’, and you’ll now have to endure a wave of tough Megatons, Manglers, Mimics, and Krasny Soldats.

When the final Megaton is killed, go and pick up the ‘Uranium Rock.’ This will initiate a five-minute countdown timer, so take the rock to the workbench in the tent you found the second Satellite in’West Berlin Street’.

Craft the Uranium device and swiftly head to the beginning of the map to attach the device to one end of the zipline that travels between two buildings.

G back to ‘Checkpoint Charlie’, grab the other Radioactive rock, repeat the whole process, and this time attach the device to the other end of the zipline. If it’s worked, the materials will fly down the zipline until they collide with each other, explode, and drop ‘Cleansed Rock.’

Take it to the Secret Lab and deposit it on the platform with the three canisters. Sadly, the whole process now needs to be repeated to create one more piece of Cleansed Rock. Meaning killing another Megaton, claiming the materials, and repeating all the previous steps, e.g., taking the rock to the table, making the device, and strapping them to the zipline.

Collect the second rock produced by the zipline explosion, and we can finally head towards the endgame.

11. Secret Lab & Doctor Valentina Boss Fight

doctor valentina boss fight

It’s finally time to finish this once and for all. Doctor Valentina will spawn through a Portal in the Secret Lab, and you now have to kill her!

The main takeaway here is that you need to stay consistent and damage her. If left unharmed for a few seconds, she will regain her shield.

One crucial thing to note here is that you can go around the map, buy armor, ammo, build Scorestreaks, etc., to help you with this fight.

She has different phases and attacks, with the main one to watch being a move that can absorb health from other Zombies – stop her from doing this.

Her other devastating threat is a charged-up attack that can one-shot you, even if you have full armor. Take your time, be strategic, and you should be able to beat her.

After the cut-scene, there is a task, and that is to protect Klaus as he slowly walks towards the portal. Do this, and you will have completed the Mauer der Toten Easter Egg!


If you enjoyed this guide, why not check out how to complete the Die Maschine Easter Egg, the Firebase Z Easter Egg, or the Outbreak Easter Egg.

Also, make sure you’re on top of all the latest Call of Duty: Vanguard details, especially its Treyarch-developed Zombies content.

Image Credit: Activision / Treyarch

Call of Duty: Black Ops Cold War

Cold War & Warzone players claim Windows 11 & Overwolf cause permanent PC bans

Call of Duty players are reportedly getting permanently banned from Warzone and Cold War for using Windows 11 and Overwolf together.

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Mason fighting zombies in black ops cold war

Call of Duty PC players have reported that using a combination of Windows 11 and Overwolf software is getting them permanently banned from Warzone and Cold War, with no sign of the ban being lifted.

Call of Duty devs have been waging an ongoing war with hackers and cheaters, with one dev saying that they are “ruining some of the best work” of his life. Over 800,000 accounts have now been banned, but perhaps not all bans are fair.

Cold War and Warzone PC players are claiming that upgrading to Windows 11 and using it alongside Overwolf is causing them to be permanently banned.

GRAV in Call of Duty Warzone Season 6

Overwolf is a platform used to create and install in-game apps, such as ‘Outplayed’ which allows players to record their footage. However, this Overwolf app is reportedly causing permabans when used alongside Windows 11.

Reddit user WraithGG claimed they were permanently banned from Warzone “a few weeks ago” after attempting to open Cold War on an Insider Build of Windows 11, with Outplayed from Overwolf open. They said that this is a “well known and apparently rather common issue,” and both Activision and Overwolf are “refusing” to lift the ban or help.

“I have finally received a response from Activision telling me that despite being innocent, they cannot unban my account,” said WraithGG. “They have acknowledged the error in the ban, but are refusing to lift the ban as all bans are final.”

They claim to have also gone to Overwolf regarding the ban, but “Overwolf are also refusing to help, stating that they are not responsible.”

It appears that WraithGG isn’t alone, with Reddit user rks0707 saying that “I switched to 11 and bam! Got permabanned.” They also said that “Activision offer no solution for it.”

If this problem becomes more widespread, Activision may change their stance and unban players flagged for using Windows 11. This could be a similar story to Cold War Zombies players who were unfairly banned by the Sail 630 Nuclear Bug, and later had their accounts restored.

These reports have made some users worried about Vanguard’s upcoming kernel-level RICOCHET anti-cheat, which launches with its Warzone integration.

Image Credit: Activision

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Call of Duty: Black Ops Cold War

Black Ops Cold War players are not happy with new LAPA SMG

The LAPA is a new SMG for Black Ops Cold War in Season 6, but fans have complained that it may not be as useful in-game as they hoped.

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LAPA in Black Ops Cold War

Black Ops Cold War Season 6 is the last hurrah for the latest CoD entry before Vanguard takes center stage. Unfortunately, the new LAPA SMG has players talking for the wrong reasons since its addition in the last major update.

Black Ops Cold War Season 6 is the last chapter before the release of Call of Duty: Vanguard on November 5.

Developers added a whole host of new content for Season 6, from a new Battle Pass to a host of Halloween-themed challenges.

Unfortunately, not all of the new additions have gone down well among the community, with the new LAPA SMG in particular user under fire from fans.

LAPA in Black Ops Cold War

Reddit user PartyImpOP posted expressing their confusion on what the purpose of the LAPA is when its characteristics are compared with other weapons in the same class.

“…the only thing this thing has is relatively good handling, which is hardly even significant considering all SMGs carry that trait anyways,” said the user.

“It’s the slowest killing SMG, and depends on headshots to simply equal the body shot TTK of other SMGs, and has a very slow muzzle velocity to the point where it becomes almost unusable.”

They go on to say that the LAPA is a less effective version of the Milano 821 or AK-74u, meaning that there is little reason to choose it in multiplayer modes.

PartyImpOP also slammed the rest of the Season 6 content, such as “the worst weapon in the Call of Duty history” in the Battle Axe.

Other players were quick to respond to the post, calling the new additions in Season 6 “filler” content at the end of the game’s life in the spotlight.

“Honestly, they were probably just afraid to release more broken weapons right before they abandon ship on this game,” added another Reddit user.

Warzone and Black Ops Cold War The Haunting event challenges rewards

While The Haunting event has been a hit for the most part for Call of Duty fans, it’s clear that some of the new content is living up to expectations.

With so little time before Vanguard drops, it remains to be seen if Raven will take steps to make the LAPA more useful.

For more on Black Ops Cold War, check out the 10 best guns in the game, as well as how to open Scare Packages in Season 6.

Image credits: Activision

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Call of Duty: Black Ops Cold War

How to get Donnie Darko Frank skin in Warzone & Cold War: Release date, price & contents

Warzone and Black Ops Cold War players will be able to get the Frank The Rabbit skin from Donnie Darko during The Haunting event.

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Frank The Rabbit skin in Warzone and Cold War

The Haunting event will be delivering plenty of scary moments for Call of Duty: Warzone and Black Ops Cold War players, and they will be able to experience them as the Frank The Rabbit skin from Donnie Darko.

It is the Halloween season, and Call of Duty is celebrating the spooky time with the second iteration of The Haunting event, which became a fan-favorite in 2020, especially in Warzone.

The Haunting event for the Black Ops Cold War cycle will feature some significant differences compared to the Modern Warfare version, but it will still feature two horror movie icons that players will be able to purchase skins for and terrify their enemies.

Joining Scream’s Ghostface, Frank The Rabbit from Donnie Darko will also be appearing in The Haunting event, so here is how to unlock the Donnie Darko Frank skin in Warzone and Black Ops Cold war.

Frank The Rabbit Donnie Darko skin in warzone and Black Ops Cold War

How to get Frank The Rabbit Donnie Darko skin in Warzone and Cold War

Players can now unlock the Frank The Rabbit Donnie Darko skin in Warzone and Cold War, as October 24 is when the Donnie Darko Tracer Pack was added to the Call of Duty store for both games.

All you need to do is go to the Call of Duty store in either Warzone or Black Ops Cold war and purchase the Donnie Darko Tracer Pack to acquire the Frank The Rabbit Donnie Darko skin in Warzone and Cold War.

How much does the Donnie Darko Tracer Pack cost?

The Donnie Darko Tracer Pack will set you back 2,400 COD Points, understandable given the top-tier nature of the costume and license, and this translates to roughly $19.99 / £16.79.

Frank The Rabbit Donnie Darko skin in Black Ops Cold War

What’s in the Donnie Darko Tracer Pack?

You can find everything that will be in the Donnie Darko Tracer Pack below:

  • Frank The Rabbit Operator skin
  • “Sky is Falling” finishing move
  • Epic-Rarity Weapon Charm
  • Epic-Rarity Calling Card
  • Epic-Rarity Emblem
  • Epic-Rarity Watch
  • Legendary Sniper Rifle blueprint
  • Legendary SMG blueprint
  • Legendary Assault Rifle blueprint

There is no doubt that plenty of players will be excited to get the Frank The Rabbit Donnie Darko skin in Warzone and Cold War and dominate their opponents in a truly terrifying fashion.

For more Call of Duty: Warzone, check out the most popular loadouts for the Call of Duty battle royale in Season 6, and stay tuned for future news and guides.

Image Credits: Activision

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