Sigma Theory
Strategy In-app purchases
Use your skills in diplomacy, spy, and assassination to control the Sigma Theory
- Rating
- 4.0
- 163 ratings
- Downloads
- 11.8K+
- on Google Play
- Price
- $6.99
- In-app purchases
- Updated
- Jan 9
- 2026 · v1.2.12
Screenshots
About Sigma Theory
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.
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.
What’s new
Version 1.2.12 · Updated January 9, 2026
Bug fixes and improvements
Frequently asked questions
What is Sigma Theory?
Sigma Theory is a Turn-based Strategy game in a futuristic global cold war where players recruit a squad of special agents and run an intel agency to control the singularity.
What is the story of Sigma Theory?
In the near future, a paradigm-shifting scientific discovery called "The Sigma Theory" promises radical new technologies. Nations compete to harness this discovery for their own benefit, leading to a global cold war scenario.
How do you win in Sigma Theory?
In Sigma Theory, the objective is to ensure that your nation reaps the benefits of Sigma Theory before any other country. Players must use their resources, including special agents, tactical drones, diplomacy, and subterfuge, to achieve this goal.
What is the gameplay like in Sigma Theory?
Sigma Theory is a turn-based espionage game where players use special agents to dominate the world. Players can engage in seduction, blackmail, manipulation, and industrial espionage to advance their cause. The game also features a dynamic narrative with over 100 NPCs to interact with and field operations where players can direct the kidnapping of targets in cities around the world.
Can you choose your playstyle in Sigma Theory?
Yes, players have the freedom to choose their playstyle in Sigma Theory. They can develop and manage relations with various NPCs, such as lobbies, armed groups, and politicians, and make choices that involve alliance, deception, or assassination. Discretion or direct confrontation in field operations also depends on the player's preferences and strategy.
Alternatives to Sigma Theory
Looking for apps like Sigma Theory? Here are 6 similar Android apps on Google Play. The highest rated is ScourgeBringer (4.6/5), and 1 of the 6 are free to download.
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Battle Chasers: Nightwar 4.1
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Shattered Plane: Turn-Based St 4.1
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Warhammer Quest: Silver Tower 4.3
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ScourgeBringer 4.6
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Crowntakers 4.4
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Zombicide: Tactics & Shotguns 3.9
| App | Rating | Price | Installs | Last updated | Compare |
|---|---|---|---|---|---|
| Sigma Theory | 4.0 / 5 | $6.99 | 10,000+ | Jan 9, 2026 | |
| Battle Chasers: Nightwar | 4.1 / 5 | 9.99 USD | 100,000+ | May 26, 2026 | Compare |
| Shattered Plane: Turn-Based St | 4.1 / 5 | 0.99 USD | 1,000+ | Mar 15, 2020 | Compare |
| Warhammer Quest: Silver Tower | 4.3 / 5 | Free | 100,000+ | May 19, 2026 | Compare |
| ScourgeBringer | 4.6 / 5 | 6.99 USD | 100,000+ | Mar 4, 2025 | Compare |
| Crowntakers | 4.4 / 5 | 2.49 USD | 5,000+ | Jun 8, 2017 | Compare |
| Zombicide: Tactics & Shotguns | 3.9 / 5 | 5.99 USD | 10,000+ | Jul 10, 2019 | Compare |
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