Navigating the war-torn streets of East Berlin in Call of Duty: Black Ops Cold War Zombies presents players with one of the most immersive experiences in the franchise. Completing the main story quest on Mauer Der Toten requires a mix of resource management, precise exploration, and strategic combat. Understanding the foundational steps ensures your team survives the intense undead encounters while advancing through the narrative.
Restoring Power and Unlocking the Wonder Weapon
Your primary objective upon entering the map is turning on the main generator power and activating the Pack-a-Punch machine. After restoring power, players must build Klaus the robotic companion by acquiring his battery and robotic hands. Klaus will assist in breaking down a hidden wall in Hotel Room 305 to reveal a safe containing the powerful CRBR-S wonder weapon.
Upgrading Klaus and Accessing the Secret Lab
With the CRBR-S in hand, players need to equip Klaus with a blacklight retrieved from a locked locker in the Switch Control Room. Searching specific electrical panels around the city unlocks new cosmetic upgrades and allows Klaus to gain maximum power. Once fully upgraded, Klaus can punch through a reinforced wall in the Sewer Access to expose the entrance of the Secret Lab.
Harvesting Canisters and Stopping the Train
Inside the Secret Lab, collecting three empty canisters allows you to place them into specialized harvesters scattered across West Berlin and surrounding rooftops. Throwing essence traps lures Tempests to charge the canisters before returning them to the lab. Players then command Klaus onto the subway tracks to stop an oncoming train, securing the warhead and keycard required for the final steps.
Cleansing Uranium and Defeating Valentina
Activating the orbital satellite triggers a timed objective where players must craft uranium devices and cause them to collide via zip lines. Once the purified uranium is secured in the lab, you will initiate the climactic multi-phase boss fight against Valentina across various rooftop locations. Defeating her requires shielding yourselves from her wipe attacks, managing ammo, and escorting Klaus to his final destination to complete the quest.
