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Operation Chaos & Operation Red Circus Complete Guides (Black Ops Cold War Side Missions)

For the first time in the history of Call of Duty, Black Ops Cold War includes a feature where you must collect evidence and analyze them for clues. Adding to the gameplay's interactive aspect, there are two optional side missions that you can complete. However, completing these missions requires you to first collect evidence, decipher codes, and solve puzzles.

The two side missions are Operation Chaos and Operation Red Circus, where you assume control of Mason as he and Woods go on these missions to take out specific targets associated with Perseus, in hopes of reducing his influence and hold.

Below, we have covered everything you need to know to complete these side missions, from collecting the evidence to solving them.

Operation Chaos

Operation Chaos is available on the evidence board after the completion of the 'Fracture Jaw' mission. However, you will not start this side mission just yet. You must wait until the completion of the 'Red Light, Green Light' mission as you will need to collect three pieces of evidence used to decrypt the floppy disk for Operation Chaos mission.


These pieces of evidence are found in different missions. We have listed down all the pieces of evidence and where you can find them below.

Evidence Collection

There are three pieces of evidence, as mentioned before. You can find them in three different missions that are as follows.

  • Coded Message: The first piece of evidence is a coded message that you can get by interrogating Qasim Javadi in the first campaign mission, 'Nowhere Left to Run.' During the interrogation, a dialogue prompt will pop up that reads, "who's Arash meeting with?" select this option. Qasim will spill his beans about the coded message upon which the evidence will be added.

  • Observer Newspaper: This evidence is added once you've collected 3/6 photo intel during the mission 'Red Light, Green Light.' When you are in the vicinity of the intel, you will get a notification at the top of your screen indicating that you are in an objective area. Check the walls around you, and you will notice a highlighted map with a camera icon on it.

    Take the picture to add it as intel. There are six in this mission, but you only need 3/6 to get the Observer Newspaper evidence. You can use only any three.

  • Numbers Station Broadcast: The third evidence is collected during the mission called 'Brick in the Wall' You will meet an informant who asks you a favor of finding her contact, to either help rescue him or eliminate him.

    Make your way to the informant who is held in the basement of an apartment. There will be several Stasi (guards) on your way to the basement. You will come across a door with apartment number 732. There will be a guard outside. Take him out, pick the lock, and enter the building.

    You will find three guards with a tied prisoner. You can easily take out these guards without getting spotted. Use your silent pistol to take them out one by one. Shooting them in the head will do the trick. After taking out the guards, check the table next to the prisoner as the evidence is on the table. What you do with the prisoner is up to you.

Decrypting the Floppy Disk

Once you've collected all the evidence, we can proceed with Operation Chaos floppy disk decryption and, finally, the mission itself. To decrypt the floppy disk, we need a code and a passphrase that we can get by using the pieces of evidence that we've collected from various missions.

Step 1 - Deciphering the code

First, open up the newspaper and you will notice that some of the letters on the newspaper headline are highlighted in red. These letters are an anagram for one of the cities in the Numbers Station Broadcast which we will come to in a bit.

The highlighted letters for us were ATATLAN, which spells the city ATLANTA. Note that the city names, numbers, and all the content used to solve is completely random and unique for every player, but the method to solve is the same.

Once you've identified the city's name, open up the Numbers Station Broadcast and check the numbers corresponding to that city. As you can see from the image below, Atlanta has the numbers 0,1,8,6.

0186 is your passcode.

Step 2 - Deciphering the passphrase

To get the passphrase, we will do the opposite. We will use the coded message from Qasim Javadi to identify the numbers and convert them into a city instead.

As you can see in the picture above. There is a sequence of numbers in both blue and red, with some missing (written as "?"). We need to find the missing numbers and find the corresponding city.

First, write the red and blue numbers separately.

Red: ?, 09, 15, 21, 27

Blue: 63, ?, 69, 75, 83

The second step is to find the pattern in these numbers. Find a pattern that the numbers follow and accordingly find the missing number following the same pattern. Note that the pattern will be completely different for all the players. So, you must find your pattern. Here's an example of what our pattern looked like to give you an idea of how to approach the problem.

If we only look at the red sequence, you will notice that each number has a difference of 6. If you subtract 21 from 27, you get (-)6. If you subtract 15 from 21, you get (-)6 again. That means whatever the missing number is, it must be a product of 6 subtracted from 9. You get 3. So the missing red number is 03.

For the blue sequence, if you subtract 75 from 83, you get (-)8. If you subtract 69 from 75, you get (-)6. If you notice, the difference isn't consistent like our red sequence, where the difference of 6 was consistent throughout the sequence. Here the difference is decreasing by 2 every time we move from right to left in the sequence.

To ensure we get the far left number as 63, we must follow the same pattern of decreasing the difference by 2 every time. We will get our missing number, which is 65, by subtracting 4 from 69.

And to confirm this pattern's authenticity, we can subtract 2 from 65 to get 63, which is the first number in the sequence.

So our two missing numbers are 0365. Open the Numbers Station Broadcast once again and check which city corresponds to the number 0365. For us, it was Omaha.

Omaha is your passphrase.

Step 3 - Entering the code and passphrase

Now that you have the code (0186) and your passphrase (Omaha), you can enter it in the terminal to decrypt the floppy disk. Click on the floppy disk to access the computer terminal.

First, you will be asked to put in the code, which is 0186.

Then the passphrase, which is Omaha for us. Make sure all the letters are lower-case as these are case-sensitive. Some people have trouble with this, and they get confused.

After entering the correct credentials, you will get an "Access Granted" message, indicating the successful description of the floppy disk.

You can now proceed with the main Operation Chaos mission, where you must go through the mission to reach Aldrich, eliminate him, and take a photo of the dead body as confirmation.

This article is original content created and researched by For an overview of our process and Call of Duty credentials, please see here.


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    1. Hi Justin, thanks for your comment. Yes, it is supposed to work like that. It is unique for all players. It is randomized in each playthrough.

Hassan Sajid

Hassan has always loved Battle Royale games, right from the start of his gaming career. Aside from utilizing his engineering background in several areas of his life (with a degree from the National University Science & Technology), he loves to use his technical knowledge and skills to contribute towards the gaming community. He has played PUBG and Fortnite extensively and as a fan of the Call of Duty series, Warzone is a no brainer for him. His favourite Call of Duty title is Modern Warfare 2. Hassan uses his in-game experience to create guides and videos that are aimed at helping other Warzone players become better. Hassan is also on LinkedIn and of course Steam.