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Villedor, the city where Dying Light 2: Stay Human takes place, is an open world bustling with activities to do, from Parkour challenges to Military Airdrops; there's a lot to keep you busy. Techland wasn't kidding when they said completing all the content in the game would take around 500 hours.

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To fully experience everything this game has to offer, you should take things slow and complete the side quests available throughout Villedor. However, some of them will be more challenging than others. For example, in the "The First Biomarker" quest, you'll have to solve a riddle to open a safe in one of Old Villedor's hospitals. This guide contains all the information you need to complete The First Biomarker side quest.

Finding The First Biomarker Side Quest

riddle in The First Biomarker sidequest

To unlock this side quest, you need to go to the trading Post Settlement in Trinity. There you'll find a guy named McGregor, talk to him, and he will tell Aiden that he is the one who came up with the Biomarker design. However, the one Aiden is wearing is a newer version. According to McGregor, the original Biomarker was much more useful.

A dialogue wheel will appear, and you'll be able to ask McGregor what he is doing in a trading post and how exactly the first Biomarker was better.

McGregor will explain that the original design monitored the infection's progression and made people stronger and faster. This statement will pique Aiden's interest, so you'll have the option to question McGregor further to no why aren't people using the first version of the Biomarker instead. McGregor will explain that the first model came with "minor" side effects but won't explain what they were.

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He will also share with you that Dr. Katsumi Kobayashi, the head of the GRE back in the day, deemed the device too dangerous and locked it up in a safe somewhere inside Saint Joseph Hospital.

The safe opens by introducing a three-digit code; each number of the code is hidden behind a riddle. Here's the complete riddle:

  1. "What becomes smaller when you turn it upside down?"
  2. "An odd number – take away a letter, and it becomes even."
  3. "A little girl goes to the store and buys one dozen eggs. As she is going home, all but three eggs break. How many eggs are left unbroken?"

The first number is nine because when you turn 9 upside down, it looks like a 6. The second number is 7 because adding one letter (S) to the word even changes the word to seven. Finally, the third number is 3 because it doesn't matter how many eggs the girl had, ALL but three broke, so she has three left.

Finding The First Biomarker

Now that you know the answer to Dr. Katsumi's riddle, you need to go to Saint Joseph Hospital to find the safe. You can track this side mission from the Journal Menu and follow the yellow marker until you get there.

Finding the first biomarker

To get inside the hospital, go around the building, and you'll spot a ladder you can use. To get to the ladder, climb the chipped wall to the left, and you'll be able to reach it.

wood planks

After going up the ladder, you need to get to the room above. Climb the wood panels to gain some height and then jump to the room. You'll find the safe in an old bookcase.

Finding the safe in the first biomarker

Get close to interact with the safe and enter the code: 973

Reporting Back To McGregor

McGregor Dying light 2

Aiden will put on the Biomarker and feel the effects immediately. All you have to do now is take the Biomarker back to McGregor. He'll be in the same Trading Post where you found him.

He won't be happy that Aiden tested the Biomarker because doing so might make the device useless. Anyway, returning the Biomarker to McGregor will end the mission, and you'll receive the following rewards:

  • A Confidential Notice to GRE Personnel
  • 1 Inhibitor

NEXT: Dying Light 2 - Complete Guide