As players progress through Dying Light 2, they'll begin to unlock more and more side quest opportunities. The main story is just one facet of this lengthy title from Techland, and each time Aiden powers on a Windmill he'll be greeted by an array of NPCs that may need his help. Some of these sidequests are pretty straightforward but others can be downright puzzling.

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A good example that players will encounter early on is The First Biomarker, a sidequest that has Aiden breaking into a safe to retrieve a piece of medical tech for a gruff survivor named McGregor. Locating this particular safe and deciphering the code to access it can be a bit confusing for some. Here's a look at how to reach Dr. Katsumi's office and retrieve the old biomarker in Dying Light 2.

Finding McGregor And Starting The First Biomarker Sidequest

Dying Light 2 Hospital Map

In order to find the safe in Dr. Katsumi's office and snag the first biomarker, players will first need to locate McGregor and start the appropriate sidequest. The NPC has a particular note that players will need to decipher to gain the code for the safe, so the first step is to progress the main story until McGregor is available.

It's important to note that this particular sidequest will not be available until players have beaten the third main story quest, which has them infiltrating a Metro on Hakon's behalf. Once that mission concludes, players can head to the northern part of the map to a rooftop close to where the Trinity and Houndfield zones meet. There they will find McGregor standing outside a room containing a Trader. Talking to him and choosing the yellow response will toss players into The First Biomarker sidequest. At this point, McGregor will point Aiden to the Saint Joseph Hospital (the one he was running through earlier with Hakon) and give him a note from Dr. Katsumi concerning a safe code.

Finding The Hospital Safe In Dying Light 2

Dead By Daylight 2 Safe Hospital Path

Players should already have the Saint Joseph Hospital on their map as part of the opening tutorial takes players through the area. One one side of the building there is a ladder leading to small rooftop that players can access by running up a small ramp and jumping to a piece of exposed wall.

Dying Light 2 Hospital Safe 2

From there they can leap to the ladder and climb onto the roof. From there, Aiden can access Dr. Katsumi's office by climbing the nearby yellow fins and leaping back into the open office window across from them. Once inside, players will be able to access the safe but they'll first need to decipher the code.

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Deciphering Dr. Katsumi's Note And Getting The Safe Code

Dying Light 2 Dr Katsumi Safe Code

In order to view Dr. Katsumi's note, players need to go to the inventory menu and select the Collectibles tab at the top of the screen. Somewhere in there is a note that players received from McGregor at the start of the mission. The note has three separate riddles on it and solving each one will give players a singular number for the 3-digit safe combination. The three riddles and their solutions are as follows:

  • "What becomes smaller when you turn it upside down?" -- 9 (A 9 turns into a 6 when flipped upside down).
  • "An odd number – take away a letter and it becomes even." -- 7 (The number Seven is odd and when the S is removed from its name it turns into Even)
  • "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?" -- 3 (The riddle states that all but three eggs have broken meaning only three eggs are left).

To crack the safe, players simply need to enter the number 973 on the dial.

Afterward, they can head back to McGregor to complete the sidequest, and they'll receive a single Inhibitor for their trouble.

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