Sigma Theory is a strategy app developed by Plug In Digital.
Download Statistics
Sigma Theory has been downloaded 12 thousand times. In the last 30 days, the app was downloaded 180 times. It is ranked #125 in strategy.
User Ratings
Sigma Theory is rated 4.03 out of 5 stars. The rating is based on 140 ratings.
App Information
Sigma Theory costs $6.99 to download. The APK download size is 148.34 MB. The latest version available is 1.2.12. The last update was on October 13, 2025.
Technical Requirements
Sigma Theory requires Android 5.1+ or higher. The app has a content rating of Medium Maturity. The app has been available on Google Play November 2022.
Description
Sigma Theory is a Turn-based Strategy game in a futuristic global cold war from the award-winning creators of Out There.
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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.
★★★★★Adrian Nicolicea· Nov 19, 2025
Decent game, good replayability, good decision-making, nice graphics, cute story, cute endings, but it gets too repetitive. Wife mechanic also sucks is more of a negative wildcard than anything. Great experience overall, played for 3 days like crazy.
★★★★★L· Mar 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
★★★★★Riley Chance· Aug 18, 2023
Own about this and the PC copy, this runs leagues smoother than the PC copy of this game. And it's fun too. Sigma Theory AKA politician having a heart attack simulator is you taking the perspective of a spymaster and diplomat who's trying to help your country win a Cold War for new technologies that will redefine what it means to be human. I will not spoil the god tier ending. But be warned that there is a pun intended somewhere in this. So synchronize the Doomsday Clock to 1 a.m. and have fun
★☆☆☆☆Sweet Balls· Jan 1, 2023
I only give it one star because I already pay $6 for this game, only for the countries I always main in the Steam version (USA, China, South Korea and Germany) to be in the pay wall for another $4?! Which is all free in the Steam version ffs! Those countries are not even unlockable here in mobile version once you finished the game using the free countries you have. Steam version dlcs only have Nigeria and Brazil in the paywall, and they cost $2 each. Sheesh!
★☆☆☆☆Chico· Nov 14, 2022
I bought this game and the added content. For some reason unknown to me, it says I was refunded, and now my bought content is locked. Fix this bug. Bought the bundle again and after a few days it refunded me again... smh
★★☆☆☆Adam K Bice· Feb 24, 2026
A tutorial would be nice. Choose story mode as it seemed to be a regular game "enhanced with a personal narrative." The Classic mode may have a built-in tutorial, but it should really be an option presented to the player before starting any first-time play through.
★☆☆☆☆Suellen Laing· Oct 18, 2022
Can't even start the game, recruitment failed, recruitment failed fine...game failed to interest me then
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