In Weapon in Cod: Black Ops Cold War.
One option to find the Wonder Weapon is for players to spend points on the Mystery Box, which has a small chance of rewarding players with the energy pistol. If players instead opt to find the gun through the quest, they can bring Klaus to the Switch Control Room. Once inside, players should search for a locker labeled with a zero. Once players target the locker using their Tactical Equipment, Klaus will be able to open it. Players should collect the blacklight flashlight. From there, players should proceed to the Garment Factory and use the blacklight to find hidden numbers. Players should note that while they are collecting the number clues, they will also have to defeat enemy zombies in Cod: Black Ops Cold War.
Players should then proceed to the Service age where they will find another set of clues with their flashlight. Finally, players can locate the third set of clues at the Grocery Store. Once players have the data from all three locations, they should proceed to Hotel Room 305, where they originally found the robot hands for Klaus. Players should input the numbers they collected into the safe in the hotel room to find the CRBR-S Wonder Weapon.
Cod: Black Ops Cold War Zombies Mauer der Toten Quest
Equipped with the Wonder Weapon, players then need to find a Microwave Dish and two Cosmetic Disks. The Microwave Dish can be found in the debris near the Pack-A-Punch machine, and the Cosmetic Disks are in two of six boxes that have a picture of Klaus that appear when players shine their blacklight on it on the Mauer der Toten map in Cod: Black Ops Cold War. Once players have acquired all three items, they should return to the Upgrade Station at the Garment Factory and upgrade Klaus.
Players will then discover they can upgrade Klaus again if they collect an Antenna, Transistor, and Electronic Boards. To find the Antenna, players should shoot the tower on the apartment rooftop using their Wonder Weapon. The Transistor can be found in the Electronics Store inside boombox radios, and Electronic Boards are at the Ghost Station platform inside a small box on the top left of the window inside the ticket booth window. Once players have collected all three items, they should return to the Safe House to upgrade Klaus with the Hacking Helm.
With the Wonder Weapon in Cod: Black Ops Cold War equipped and Klaus fully upgraded, players will be able to access a secret lab. Players should bring Klaus to the Sewer Access and head up the set of stairs that lead to a brick wall. When Klaus punches the wall, he will reveal a hidden door. Once inside, players will need to charge three energy canisters and activate the Disruptor Satellite before facing the boss, Valentina.
Call of Duty Black Ops: Cold War Zombies is available on PC, PlayStation 4, PlayStation 5, Xbox One, and Xbox Series X/S.