Security 51
- Windows
- macOS
About this game
A "SIMPLE" JOB
Security 51 is an atmospheric 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 and passes. 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. 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 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.
System requirements
- OS
- Windows 10 64 bit
- Processor
- Intel Core i5-6400 or analog
- Memory
- 8 GB RAM
- Graphics
- AMD Radeon RX 550 or NVIDIA GeForce GTX 960
- Storage
- 2 GB available space
- Additional Notes
- Stay Hydrated
Support links
Showing 24 of 68 achievements24 of 68

You're a Guard, Harry!
Finish your first workday

Maître D'
Send 100 people to the isolation ward

Hard Day
End the workday with 1 point of sanity

A Little Treat!
Buy a pastry

Bring me antidepressants, Santa!
Buy antidepressants 50 times

Full Belly, Happy Heart
Buy 3 sandwiches in one evening

This Will Only Sting a Bit!
Accidentally graze an anomaly when taking a blood sample

Say "Cheese!"
Take photos of 100 anomalies

Weird Science
Conduct all experiments in the isolation ward

Click-Clack!
Punch 25 passes

I Saw Some [Redacted]
Face 25 emergency situations in the isolation ward

It's Just Not Your Day
Not a single right decision all day

Excellent Guard
Not a single mistake all day

Professional
Not a single mistake for five days in a row

No Overtime!
Run out of time

Here's Your Pass!
Punch 100 passes