Mauer der Toten — Black Ops Cold War Zombies Easter Egg Guide

Descend via arrows, ziplines and the subway. Two quest Tempests underground each drop a fuse; install both at the power switch to energise the map, then return to Checkpoint Charlie, clear the wave and unlock Pack-a-Punch.

• Both Tempest fuses installed
• Power on
• Pack-a-Punch active at Checkpoint Charlie

Apply the Brain Rot ammo mod to a zombie and let it tear down the Room 305 barricade, then take the Robotic Hands from the corpse. Kill a Krasny Soldat (from around round 10) for its Battery. Install both into Klaus at the Safe House and activate him.

• Robotic Hands from Room 305
• Battery from a Krasny Soldat
• Klaus assembled and active

Search the Death Strip debris piles until the Microwave Dish appears and mount it at the Garment Factory station. Let Klaus rack up roughly 45 kills until his monitor turns green, then command him into the station and defend him through the lockdown.

• Microwave Dish found and installed
• Klaus monitor green (~45 kills)
• Garment Factory defence survived

Take the blacklight (from the CRBR-S route) and scan six candidate electrical boxes; only two show the Klaus symbol and hold floppy disks. Insert each at the Garment Factory and complete its defence cycle. Klaus must be fully upgraded or he cannot hold the train.

• Candidate boxes: 5th Floor Apartments
• Hotel Lounge
• Ghost Station
• Maintenance Tunnel
• West Berlin Street
• Blasted Suite
• Two floppies inserted and both cycles completed

Command Klaus to break the locker in the Switch Control Room for the blacklight, then read three marked numbers under UV. The code is randomised every match but always sits in the same three spots, and each number belongs to a specific dial — Garment Factory → dial 1, Service Passage → dial 2, Grocery Store → dial 3 (a number is only valid for its own dial). Dial them into the safe in Hotel Room 305 to collect the CRBR-S.

The numbers are invisible to the naked eye — you must have the blacklight equipped (it glows purple) to read them. The map marks each spot with a number-in-a-circle, but that marks the location, not the digit: only the position is fixed, the value rerolls each game, so never reuse a code from a video.

• Dial 1 — Garment Factory, by the staircase (read off in your match)
• Dial 2 — Service Passage tunnel, left of the ladders (read off in your match)
• Dial 3 — Grocery Store, corner of the room (read off in your match)
• Enter all three in order at the Room 305 safe — never guessed digits

Shoot three Hacking Helm parts with the CRBR-S: the Apartment Rooftop radio tower, the Ghost Station wall box near the M16, and the correct Electronics Store boombox. Collect all three and craft the helm onto Klaus at the Safe House.

• Rooftop radio tower part
• Ghost Station wall-box part
• Electronics Store boombox part
• Helm installed on Klaus

Command Klaus to punch the marked brick wall at Sewer Access, then melt the inner metal wall with the CRBR-S Blazer beam. Survive the forced Tormentor wave, take the three canisters from the Conversion Unit area, and shoot the lab machine to craft an Endstation Lure.

• Klaus punches the brick wall
• Blazer variant melts the metal wall
• Tormentor wave cleared
• Three canisters + first Endstation Lure collected

Three of seven harvester sites are live each match. At each: install a canister, throw an Endstation Lure, and kill the spawned Tempests close to the harvester so credit counts, then return the charged canister to the lab. Repeat until all three are charged.

• Possible sites: West Berlin Street
• Destroyed Penthouse
• East Berlin Street
• Korber Rooftop
• Alley
• Sewer Access
• Ghost Station (kill each Tempest inside the harvester radius)

Flip the rail switch in the Switch Control Room, then position fully upgraded Klaus at Ghost Station on the far track — the one farthest from the Mule Kick machine (cross the near tracks and place him on the outer set). He physically stops the incoming train. Board it fast — the sequence is timed — and take the Bomb from the crate in the middle car and Rico's Keycard from the body in a seat, then install the Bomb in the Conversion Unit.

• Rail switch flipped
• Klaus holds the correct far track
• Rico's Keycard + Bomb collected
• Bomb placed in Conversion Unit

Advance the Safe House computer to begin the uranium objective. Kill the HVT Megaton for two Uranium Rocks, craft Uranium Devices at the West Berlin Street and Military Tent benches, and attach one to each end of the zipline (Destroyed Penthouse and Korber Rooftop) so they collide. Grab the Cleansed Uranium below and insert it into the Conversion Unit.

• Megaton killed, two rocks taken
• Two Uranium Devices crafted
• Devices collide on the zipline
• First Cleansed Uranium inserted

Repeat the full cycle for a second Cleansed Uranium. Buy everything first: armour, self-revive, perks, Pack-a-Punch upgrades, ammo and support streaks. Inserting the second rock immediately starts Valentina with no shop break.

• Second cycle completed
• All prep purchased
• Second Cleansed Uranium inserted (starts the boss)

Valentina teleports through four arenas — Apartment Rooftop, West Berlin, East Berlin, then the Secret Lab. Break her blue shield before any health damage counts; it comes back at each health checkpoint and if you stop shooting, so bring sustained DPS (Pack-a-Punched CRBR-S/LMG or a gun streak). Keep armour up for the orange crystal barrage — an upgraded Ring of Fire in front of you destroys the crystals. The moment the screen ripples blue and the HUD shakes (the blue wipe aura), break line of sight behind cover or it one-shots you. Kill the floating zombies feeding her healing ring fast.

Helper: Valentina attack & counter reference.

• Orange barrage — sprint laterally
• Blue aura — break sight behind cover
• Healing ring — kill the linked floating zombies
• Shield broken each phase before health damage
• Final lab phase finished

With Valentina down, Klaus lifts the warhead and walks toward the portal. Clear every enemy off him so he keeps moving; when he reaches the portal the bomb detonates and the ending cinematic plays, completing 'Tin Man Heart'.

• Klaus takes the warhead
• Escort defended to the portal
• Completion cinematic triggers