Sigma Theory

In-app purchases
166 reviews
Content rating
USK: Ages 12+
10K+
Downloads
Google Play Games on PC is required to install this game on Windows. By downloading the app and the game, you agree to the Google Terms of Service and Google Play Terms of Service. Learn more.
€0 with a Play Pass subscription Learn more
Content rating
USK: Ages 12+
Abstract Violence, Drug Use
In-Game Purchases
Learn more
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About this game

Sigma Theory is a Turn-based Strategy game in a futuristic global cold war from the award-winning creators of Out There. Recruit a squad of special agents and run your intel agency to secure the control of the singularity.

STORY
In the near future, a paradigm-shifting scientific discovery looms over the world, promising radical new technologies. The world’s superpowers realize they could have the power to destroy the global financial system, wipe out entire countries or even gain access to immortality.

However, this discovery — called “The Sigma Theory” — can only be harnessed by a handful of scientists. You are placed at the head of your country’s Sigma division. Your objective is to ensure that it is your nation that reaps the benefits of Sigma Theory before anyone else.

To achieve this you will have powerful resources at your disposal: a cadre of the world’s most elite covert agents, advanced tactical drones and, of course, your own skills in diplomacy and subterfuge.

It’s a cold war out there, one in which mankind must face up to its future.

THE ULTIMATE ESPIONAGE SIMULATION
Turn-based espionage: Use your special agents to dominate the world. Seduction, blackmail, manipulation, industrial espionage… Every low blow is both permitted and encouraged.
Dynamic narrative: Develop and manage your relations with over 100 NPCs: lobbies, armed groups, politicians… Alliance, deception or assassination, you choose.
Field operations: Direct the kidnapping of your targets during gripping pursuits through the world’s greatest cities. Discretion or direct confrontation, your agent’s life is in your hands.
Global Cold War
Updated on
Jan 9, 2026
Available on
Android, Windows*
*Powered by Intel® technology

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Device or other IDs
  • Data is encrypted in transit
  • Data can’t be deleted

Ratings and reviews

150 reviews
Vinícius Dias
December 12, 2025
The lack of a tutorial was an incredibly bad decision. This game, although not difficult, is very far from intuitive. There are quite a few ways to get an edge over other countries and what to focus on during espionage, so as long as you've got the basics down, it's a good time to explore with agents. And that's about it... Replayability is limited by your interest in the spies and whether you're willing to make them work, but it can only get you so far. Overall, it's ok for play pass.
4 people found this review helpful
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L
March 21, 2026
I cannot recommend this game followed by their (sequel?) Over the Omega enough! I had downloaded both games on the same day, not realizing they were made by the same creator. I started with Over the Omega and then played this game a week later. Only after finishing Sigma Theory did I realize how deep and artistic these two games are! Great for people who enjoy strategy games, asset management with a lot of involved storytelling! Great for exploring ideas of what makes us human. Kudos to the Devs
4 people found this review helpful
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Andrew Gorman
November 24, 2025
I feel like they did a really good job with this one and it lends itself to some replayability. Not as much as some others but it's still there. The idea and core concept is interesting enough to feel fresh and the gameplay loop is enjoyable. You can tell they did a really good job with balancing all of the agents because it's genuinely hard for me to pick which ones I want on any given playthrough. I still haven't gotten to the end but I'm liking it a lot so far.
6 people found this review helpful
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What’s new

Bug fixes and improvements
Content rating
USK: Ages 12+
Abstract Violence, Drug Use
In-Game Purchases
Learn more

Play on PC

Play this game on your Windows PC with Google Play Games

Learn more

Official Google experience

Bigger screen

Level up with improved controls

Seamless sync across devices*

Earn Google Play Points

Minimum requirements

  • OS: Windows 10 (v2004)
  • Storage: Solid state drive (SSD) with 10 GB of available storage space
  • Graphics: IntelⓇ UHD Graphics 630 GPU or comparable
  • Processor: 4 CPU physical cores
  • Memory: 8 GB of RAM
  • Windows admin account
  • Hardware virtualization must be turned on

To learn more about these requirements, visit the Help Center

Intel is a registered trademark of Intel Corporation or its subsidiaries. Windows is a trademark of the Microsoft group of companies.

*Might not be available for this game

App support

About the developer
PLUG-IN-DIGITAL
contact.google.play@plugindigital.com
8 B BOULEVARD BERTHELOT 34000 MONTPELLIER France
+33 7 44 31 11 05

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