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Security 51

by Alawar · 12 Aug, 2026

17 downloads

267 MB
3 hours ago
3 hours ago
CSF + Goldberg

About the Game

A "SIMPLE" JOB

Security 51 is an atmospheric horror security guard simulator inspired by Papers, Please, and SCP paranoia. You're on duty in the underground bunker of Area 51, where the most dangerous part begins at the elevator: the shaft descends for miles down to unknown levels. Whether it's laboratories, anomalies, inhumane experiments, or something alien—you're not supposed to know. Your task is simple: let in those who have access and stop those who don't... even if everything looks "right" on the surface.

SECURE, CONTAIN, PROTECT

Everyone who passes through your checkpoint carries papers, passes, or verbal orders. Your job is to check names, positions, clearance levels, and time, ensuring the number of people entering and leaving matches, and pay attention to any oddities. These could be incorrect answers, behavior that deviates from protocol, slurred speech, or even documents that seem too perfect. As time passes you'll catch yourself thinking that something's wrong more and more, and the only thing to rely on will be the protocols. But even they can be wrong.

TOTAL CONTROL

With experience, you'll gain increasingly more accurate methods of identity verification, such as fingerprint verification or blood testing. Did that janitor simply open the wrong door, or are they a spy for an enemy government? Or are they not even human? When in doubt, quarantine the suspect. Sometimes you'll make mistakes and lock up an ordinary employee, and sometimes you'll find a titanium cell ripped open from the inside. Some decisions will have immediate consequences, others only after several shifts.

CONTAIN THE THREAT

The consequences of every mistake go far beyond issues in the workplace. Let the wrong person out, and the infection will ravage the city. Isolate suspicious employees, investigate anomalies, and launch new operations to contain the threat before it's too late.

Remember, it's not just about who you let in, but who or what you let out into the world.

Screenshots

19 images
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Version Information

Latest Version

Latest on Steam

SteamDB

Build 24711742

Released Aug 13, 2026

Current Release

Build 24711742

Uploaded Aug 13, 2026

System Requirements

OS Windows 10 64 bit
CPU Intel Core i5-6400 or analog
RAM 8 GB RAM
GPU AMD Radeon RX 550 or NVIDIA GeForce GTX 960

How to Install

1
Download all files
2
Extract the .ZIP file to a folder (use WinRAR or 7-Zip)
3
Run Security51.exe to play
Troubleshooting tips

• Run Redist/_CommonRedist installers if game won't start

• Add folder to Windows Defender exclusions

• Run as administrator

Download

Direct link available

Archive password

Needed when extracting (WinRAR / 7-Zip) — not a site login.

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Download Security 51 for PC with a direct link or via torrent. Get the full version of Security 51 for free. Security 51 is a Adventure released by Alawar.

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