Security 51 Walkthrough – Day 15 to 24 (Level 2)

Welcome to part 2 of Into Indie Games’ walkthrough for Security 51.

You’ve become a pro at the job and have earned the supervisor’s trust. On Day 15, you’re getting promoted to Level Two. This comes with a raise in your earnings, but you’ll also have more responsibilities.

This article is part of our Security 51 Walkthrough Hub.

For more information about the game, check out its Steam page here.

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Day 15 (UV Light)

On Day 15, you get promoted to Level Two. The Supervisor tells you that the Los Evos Fungus has mutated and now you need to figure out a way to deal with the imminent Zombie Apocalypse. As you move on to the new level, you’ll gain access to more Tools to screen the visitors, the first of which is the UV Light.

Day 15 Instructions are as follows:

• Always let through, except when the following are detected:
  • Mismatched details between passport and pass (name, number, or photo)
• Call Security, ignoring previous instructions, if the following are detected:
  • Rotting internal organs
  • Skull visible under UV light on papers
• Let through, ignoring ALL instructions if the following are detected:
  • Mysellium visible under UV light on papers
• Field Operations: Gathering zombification-case data
• Research: Quartz-12 Exposure

The first visitor will serve as your tutorial on how to use UV light. Basically, you turn on the switch at your desk and pull the papers under the light to detect hidden writings on them. For this day, if there’s a skull mark, you have to Call Security. If there is Mysellium on the paper, though, you have to let them through.

The first shift of Level Two isn’t too difficult. Just remember to do a Research and a Field Operation before ending the day. Also check the elevator for any new anomalies as visitors leave the facility. We made 1 mistake throughout the day, which isn’t too bad. But remember, the penalty for making wrong calls increases the further you progress through the story.

• Earnings: $300
• Mistakes: 1
• Bought Items: 2x Street-style noodles,1x Sedative, Thermal Imager (Area)

Day 16

The research from the previous day unlocks a new Field Operations for us.

Day 16 Instructions are as follows:

• Always let through, except when the following are detected:
  • Mismatched details between passport and pass (name, number, or photo)
• Call Security, ignoring previous instructions, if the following are detected:
  • Chitinous growths on the skin
• Let through, ignoring ALL instructions if the following are detected:
  • Microchip fragments in the photo
• Field Operations: Deploying Containment Units
• Research: Prolonged Inhalation of Lilac 8

Day 16 is pretty straightforward. You’ll have to look for Chitinous Growths on the skin. If you find some, then take a photograph to verify if they have Microchip Fragments as an anomaly. If none show up, call Security. Otherwise, let them through if the information matches.

• Earnings: $320
• Mistakes: 0
• Bought Items: 1x Street-style noodles

Day 17

We unlock three new operations on Day 17 because of successful Research.

Day 17 Instructions are as follows:

• Always let through, except when the following are detected:
  • Mismatched details between passport and pass (name, number, or photo)
  • Bone anomalies
• Let through, ignoring ALL instructions if the following are detected:
  • Other traces visible under UV light on papers.
• Field Operations: Deploying crowd-control units.
• Research: Quartz-12 Exposure.

The quickest way to complete this day is to first check the papers under UV light and then use the Bone MRI Scanner to look for any anomalies. Make sure the paper info matches when you’re checking for traces under the UV light.

• Earnings: $332
• Mistakes: 0
• Bought Items: 1x Bento, 1x Red Panda Figurine

Day 18

Day 18 Instructions are as follows:

• Always let through, except when the following are detected:
  • Mismatched details between passport and pass (name, number, or photo)
• Call Security, ignoring previous instructions, if the following are detected:
  • Packaged lung
  • Packaged liver
• Field Operations: Gathering zombification case data
• Research: High Temperature Exposure

Day 18 is pretty straightforward. Use the Organ MRI to look at the Liver and Lung. If it’s in a bag, that means you have to call Security. Otherwise, let the people go through.

• Earnings: $360
• Mistakes: 0
• Bought Items: 1x Bento, Thermal Imager (Area)

Day 19

The Isolation Ward becomes off-limits to us on Day 19 because of a transformed subject.

Day 19 Instructions are as follows:

• Always let through, except when the following are detected:
  • Mismatched details between passport and pass (name, number, or photo)
• Call Security, ignoring previous instructions, if the following are detected:
  • Gray mold on the skin
• Let through, ignoring ALL instructions if the following are detected:
  • Hypothermic Areas
• Field Operations: Barricading and setting traps
• Research: None

On Day 19, you’re unable to send people to the Isolation Ward or conduct Research. Other than that, the day is pretty straightforward. Use X-Ray and Thermal Scanners to identify anomalies and take appropriate measures.

• Earnings: $325
• Mistakes: 0
• Bought Items: 1x Bento

Day 20

The Isolation Ward becomes available for Research and Containment on Day 20.

Day 20 Instructions are as follows:

• Always let through, except when the following are detected:
  • Mismatched details between passport and pass (name, number, or photo)
  • External body anomalies
• Let through, ignoring ALL instructions if the following are detected:
  • Yellow resin on the bones
• Field Operations: None
• Research: Retro-acoustic test

For Day 20, you’ll mostly be using the X-Ray Scanner to look for body anomalies. If you find one, or if the information doesn’t check out, use the Bone MRI Scanner to look for Yellow Resin. This is the condition for letting them pass. Otherwise, deny access. There’s no reason to Call Security on this day.

• Earnings: $225
• Mistakes: 0
• Bought Items: 1x Bento

Day 21 (Blood Sample Analysis)

The supervisor comes in on Day 21, adding a new Tool: Blood Sample Analysis. From now on, you’ll also have to take Blood Samples from visitors and do analysis on them using the Microscope to look for anomalies in the blood.

Day 21 Instructions are as follows:

• Always let through, except when the following are detected:
  • Mismatched details between passport and pass (name, number, or photo)
• Call Security, ignoring previous instructions, if the following are detected:
  • Erythrocytus Necroticus in the blood
• Let through, ignoring ALL instructions if the following are detected:
  • Macrophagus Pakumanii in the blood
• Field Operations: Setting up fortified positions
• Research: Low temperature exposure

As always, the first visitor serves as the tutorial. Follow the prompts to collect the Blood Sample using the Syringe. Then use the Microscope to look for anomalies and print them out.

This is a tricky addition to your Tools, and I suggest taking things slow whenever you have to take Blood Samples. Pay close attention to which anomalies are allowed and which ones are not.

• Earnings: $309
• Mistakes: 0
• Bought Items: Printing Speed, Scanning Speed

Day 22

Day 22 Instructions are as follows:

• Always let through, except when the following are detected:
  • Mismatched details between passport and pass (name, number, or photo)
• Call Security, ignoring previous instructions, if the following are detected:
  • Skull visible under UV light on papers
• Let through, ignoring ALL instructions if the following are detected:
  • Carrion fly in the photo
• Field Operations: Distributing corpse-eater cocoon
• Research: Quartz-12 exposure

This day is relatively easier since you don’t have to look at Blood Samples. Turn the UV light on and check the papers under the light to look for Skulls. If there are no Skulls and the information checks out, then let them pass. If they don’t, then use the Polaroid and take a photograph to look for a Carrion Fly. This is the condition for letting them pass.

• Earnings: $408
• Mistakes: 0
• Bought Items: 2x Bento, 2x Sedative, Scanning Speed, Printing Speed

Day 23

We unlocked two new Field Operations on Day 23 because of the Research.

Day 23 Instructions are as follows:

• Always let through, except when the following are detected:
  • Mismatched details between passport and pass (name, number, or photo)
  • Internal organ anomalies
• Let through, ignoring ALL instructions if the following are detected:
  • Blue electrical tape on the internal organs
• Field Operations: Deploying containment units
• Research: Dihydrogen monoxide treatment

This is another easy day to manage. Simply look for a mismatch in the information and then check the internal organs using the Organ MRI Scanner. If there’s any anomaly other than Blue Electrical Tape, then deny entrance. We missed an organ anomaly and got a penalty for it.

• Earnings: $234
• Mistakes: 1
• Bought Items: X-Ray (Area)

Day 24

Day 24 Instructions are as follows:

• Always let through, except when the following are detected:
  • Mismatched details between passport and pass (name, number, or photo)
• Call Security, ignoring previous instructions, if the following are detected:
  • Erythrocytus Necroticus in the blood
• Let through, ignoring ALL instructions if the following are detected:
  • Larva Locustarum in the blood
• Field Operations: Testing anti-zombification microchips
• Research: None

This is another Blood Sample shift, which means you’ll have to collect samples and do analysis using the Microscope. Again, take things slowly and always print the anomalies before you Call Security or let someone through. I was careful, but still let one anomaly pass through.

• Earnings: $345
• Mistakes: 0
• Bought Items: 2x Bento, 1x Sedative, Thermal Imager (Area)

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This concludes part 1 of our walkthrough for Security 51. For more interesting articles related to indie games, click the links below:

• Into Indie Games Homepage
• Capy Castaway Walkthrough
• Corsair Cove – Walkthrough Hub
• Beast Of Reincarnation – Walkthrough Hub
• Shards of Order – Walkthrough & Guides Hub