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Steam News11 June 202623d ago

Security 51 Demo is Live

Dear agents, A few weeks ago, thousands of you joined the Security 51 playtest and stepped into your first shifts deep beneath Area 51. Since then, we’ve been carefully reviewing your reports, discussions and feedback.

Full notes

Full Security 51 update

Read the full published notes in a cleaner layout. The original post stays linked below.

What changed

0 fixes8 additions4 changes0 removals
  • Security
  • Gameplay
  • UI and audio
  • Performance
  • Balance
  • Events
changedA few weeks ago, thousands of you joined the Security 51 playtest and stepped into your first shifts deep beneath Area 51. Since then, we’ve been carefully reviewing your reports, discussions and feedback. The demo includes numerous improvements and additions based directly on player feedback from the playtest.
addedWhat’s new in the demo:
addedA completely reworked shift structure. Every shift now has its own duration depending on daily conditions and visitor traffic. A new clock interface shows the beginning and end of each shift
changedPerformance bonuses. Process visitors efficiently and finish your work before the shift ends to earn additional rewards
addedAdded mood tracking for isolated subjects
changedReworked balance and progression.

Security 51 changes

changedA few weeks ago, thousands of you joined the Security 51 playtest and stepped into your first shifts deep beneath Area 51. Since then, we’ve been carefully reviewing your reports, discussions and feedback. The demo includes numerous improvements and additions based directly on player feedback from the playtest.
addedWhat’s new in the demo:
addedA completely reworked shift structure. Every shift now has its own duration depending on daily conditions and visitor traffic. A new clock interface shows the beginning and end of each shift
changedPerformance bonuses. Process visitors efficiently and finish your work before the shift ends to earn additional rewards
addedAdded mood tracking for isolated subjects

Dear agents,

A few weeks ago, thousands of you joined the Security 51 playtest and stepped into your first shifts deep beneath Area 51. Since then, we’ve been carefully reviewing your reports, discussions and feedback. The demo includes numerous improvements and additions based directly on player feedback from the playtest.

What’s new in the demo:

  • A dynamic time-of-day system

  • A visible infection system. You’ll be able to monitor how far the contamination has spread across the city at the start of each day, or keep an eye on it through the bunker periscope whenever you want

  • A completely reworked shift structure. Every shift now has its own duration depending on daily conditions and visitor traffic. A new clock interface shows the beginning and end of each shift

  • Performance bonuses. Process visitors efficiently and finish your work before the shift ends to earn additional rewards

  • Expanded isolation ward outcomes. Subjects can react to containment in many different ways – some expected, some far less so. Experiment and discover the consequences for yourself

  • Added mood tracking for isolated subjects

  • Reworked balance and progression.

  • Added more visitor types.

  • Added new unique events.

  • Added new guard animations at the start of each day.

  • Added a janitor who cleans the facility and disposes of the results of… unfortunate incidents.

We’ve already been working on even more mechanics and systems for the full release. We’ll have more to share in the coming months.

The Security 51 demo is available now. It will also be part of Steam Next Fest, starting Monday, June 15. Play Security 51 demo, add the game to your wishlist and prepare for your next shift:

Security 51

Source

Steam News / 11 June 2026

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