Which digital format of Sigma Theory: Global Cold War should I buy for PC? An Account or a Steam Key ?

The account format is cheaper but has a more complicated activation process compared to a simple key or code. It may also cause access issues in the future, which is why we only recommend it to users who are familiar with this format or have used it before. If you’re looking for a simpler and safer activation process and don’t mind paying a bit more, we recommend buying the Steam Key format.

If I buy the account format of Sigma Theory: Global Cold War, will the store provide all the activation instructions?

Yes, stores that sell this format usually guide users through the entire activation process, and if any issues arise, they offer customer support services. And if they don’t help, don’t worry—we’re here to assist you too.

Can I return a digital game for PC?

Some digital formats allow returns under certain conditions.

The store does not send my order and does not respond to support. What can I do?

Don't worry, we have the solution. We will handle it ourselves.

The final price is higher than indicated.

Many stores add payment fees, taxes,... in the cart. So be prepared to spend a little more.

I'm desperate: They don't send me the game, the store ignores me. I think I've lost my money.

Calm down, don't panic. Contact us and we will help you resolve it as soon as possible.

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Buy Sigma Theory: Global Cold War CD Key for PC

Q: Why is the Steam Key of Sigma Theory: Global Cold War safer than the account format?

The Steam Key format is what we always recommend due to its ease of use and higher security compared to any other format. You just need to redeem the key in your account to download Sigma Theory: Global Cold War to your game library. The account format requires more complicated steps and is more prone to errors during activation.

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Sigma Theory: Global Cold War Steam Key: compare prices (August 2026)

A Sigma Theory: Global Cold War Steam Key — also known as a CD Key or digital code — is the official activation code you redeem on Steam and keep in your library permanently. From €0.39 (-93%) at Gamivo, 93% below the €5.39 Steam price · 11 verified stores, 15 offers in stock · Updated 52min ago.

Steam Key

Cheapest

3.8(49.4k)

€0.39 €0.46

GCDKGamivo

-15%

Copied!

Steam Key

Official store

1.8(3.7k)

€5.39

No code available

View 15 offers from €0.39

Don't like the price?We'll alert you when it drops

Historical prices

Current minimum price

Medium price

Official stores are authorized distributors, and while their prices may be higher than Key stores, their reliability is 100%.

“Choose it if you don’t mind the price difference”

Key stores are resellers and marketplaces, which is why they are usually cheaper than official stores. We only show the best ones, so you can rest assured. Plus, we offer our guarantee against any issues.

“Choose it if you’re looking for a great discount”

You still don't have enough tickets!

( You have )

Product you are redeeming

We will start the verification process of your account, which may take 48-72 hours.
If you have not broken any of our rules, we will send you the cheapest version of the game to the email address associated with your account.
In the event that the game is out of stock or only available in a format such as accounts or physical, we will offer the possibility of an exchange for a prepaid card for the minimum value of the game on our platform.
For console games, a prepaid card of different amounts will be given instead of the game, due to regional limitations.
Your tickets will disappear from your account
This promotion is only available to US, UK and EU users.
Game redemption is only allowed once every 6 months per user.

How do I earn more tickets?

You have enough tickets!

( You have )

Product you are redeeming

We will start the verification process of your account, which may take 48-72 hours.
If you have not broken any of our rules, we will send you the cheapest version of the game to the email address associated with your account.
In the event that the game is out of stock or only available in a format such as accounts or physical, we will offer the possibility of an exchange for a prepaid card for the minimum value of the game on our platform.
For console games, a prepaid card of different amounts will be given instead of the game, due to regional limitations.
Your tickets will disappear from your account
This promotion is only available to US, UK and EU users.
Game redemption is only allowed once every 6 months per user.

I accept all the rules described above

Thank you for redeeming your tickets. We will contact you shortly How do I earn more tickets?

Editions Standard

Format Steam Key

Global EU US UK

Official stores 3 stores Hide Accounts

Taxes not included!

Taxes included!

Prices without final payment fees but with discount coupons applied. Prices include payment fees and any store discount code applied. Basic price Fees incl.

Key stores

Gamivo
Kinguin
HRKGame
Eneba
Driffle
G2A
Instant Gaming
Cdkeys Com

3.8 (49.5k)

Subscription from 2.01€/month

€0.46 €0.35 How to get this price

Region Global

Product type Steam Key

Edition Standard

Fees +€0.06

4.6 (118.9k)

Subscription from 2.99€/month

€0.49 €0.44 How to get this price

Region Global

Product type Steam Key

4.2 (29.7k)

€0.57 €0.50

Product type Steam Key

4.4 (309.2k)

€0.65 €0.59 How to get this price

Region Global

Product type Steam Key

Edition Standard

Fees +€0.05

3.8 (49.5k)

Subscription from 2.01€/month

€0.74 €0.57 How to get this price

Region Europe

Product type Steam Key

Edition Standard

Fees +€0.10

4.3 (2.7k)

Subscription from 4.99€/month

€0.73 €0.66

Product type Steam Key

Edition Standard

Fees +€0.43

4.6 (118.9k)

Subscription from 2.99€/month

€0.80 €0.72 How to get this price

Region Europe

Product type Steam Key

Edition Standard

Fees +€0.09

4.3 (2.7k)

Subscription from 4.99€/month

€0.94 €0.85

Product type Steam Key

Edition Standard

Fees +€0.45

4.0 (344.2k)

No code available

€0.85 How to get this price

Region Global

Product type Steam Key

4.7 (830.7k)

Product type Steam Key

Edition Standard

Fees +€0.02

4.0 (344.2k)

No code available

€1.42 How to get this price

Region Europe

Product type Steam Key

4.8 (223.8k)

Product type Steam Key

Edition Standard

Fees -

Official stores

Steam
GamesPlanet
Greenmangaming

1.8 (3.7k)

No code available

€5.39

Region Global

Product type Steam Key

4.3 (629)

Product type Steam Key

4.7 (43.9k)

Product type Steam Key

Edition Standard

Fees -

How much does Sigma Theory: Global Cold War for PC cost right now?

Sigma Theory: Global Cold War for PC starts at €0.39 at Gamivo, a Steam key, which is 93% under the €5.39 it costs on the official store.

That €0.39 already includes the GCDKGamivo coupon, so apply it at checkout or the store will show you a higher price.

With 15 offers across 11 stores there is enough competition for the price to move, so the gap between the cheapest and the rest is worth checking before you buy.

That puts it 11% under its average of €0.44 since 2019, so today is a better entry point than most days of its life.

Is it worth buying the Steam Key for Sigma Theory: Global Cold War now or waiting?

That €1.42 key is at one of its best prices.

Those €1.42 are 71% below what it usually costs, measured on the store price.
Only 5 stores sell the Steam Key, and with that little competition the price barely moves.
Not counting today, only 3 days out of the 534 days on record were this cheap or cheaper; the lowest it has ever cost is €1.21.

At this price it is worth buying the Steam Key now: what you stand to gain by waiting is a few euros, and it is not guaranteed.

Worked out from 800 daily records of the Steam Key for Sigma Theory: Global Cold War across 12 stores. See the full price history.

The price does not include each store's payment fees. The percentage is measured on the store price, without coupons, because that is how we record the history. The analysis only counts Key offers. Shared accounts, Steam Gift and physical editions stay out, because they are not the same product and their prices move differently.

Can you activate Sigma Theory: Global Cold War in US?

11 of the 15 offers work on US — the Global ones plus the ones issued for your own region.

Why is there such an expensive Sigma Theory: Global Cold War offer?

One listing is worth ignoring: the Steam key that Greenmangaming has at €17.99 is more than 46 times the cheapest offer and is not what this game costs. The number to work from is €0.39 at Gamivo.

Important Note Before Buying Sigma Theory: Global Cold War

This product, Sigma Theory: Global Cold War, is a PC game in digital version. When we say that it is in digital version, we mean that the typical box with the game inside is not sent, but that what is sent is a digital key, better known as cd key, that you will have to introduce in the Steam games platform to activate the download of Sigma Theory: Global Cold War.

Some stores may sell this game in Steam Gift format, which is a simple link that we must click to activate the game in our account.

If we receive a key instead of a Steam Gift, we must enter the key in the Steam games platform ("Add games" section of our "Games Library") to start the download.

What about Sigma Theory: Global Cold War?

Sigma Theory: Global Cold War tells the story of how in the near future, an unparalleled scientific discovery now offers new technologies beyond the human imagination. This is when the world's organs of power, such as superpowers and mega-corporations, realize that they could have the power to destroy the global financial system, eliminate entire countries, or even access immortality. Our task is to ensure that it is our nation that gets the benefits of this technology.

To achieve this, we will have at our disposal all the resources available to the country we have selected: elite spies, advanced tactical drones and, of course, our own skills in diplomacy and subterfuge.

A full-scale cold war in which the survival of humanity is at stake.

Most common FAQs when buying Sigma Theory: Global Cold War for PC in digital format:

It is a key that will allow you to download the game Sigma Theory: Global Cold War on your PC from official download platforms.

As of 06/08/2026, in United States, the best price we have found in our selection of online stores that include the key for Sigma Theory: Global Cold War on PC is €0.39.

The Steam Key format is what we always recommend due to its ease of use and higher security compared to any other format. You just need to redeem the key in your account to download Sigma Theory: Global Cold War to your game library. The account format requires more complicated steps and is more prone to errors during activation.

The only issue we’ve encountered in 13 years is receiving a duplicate key that doesn’t work. In that case, simply contact the store where you bought Sigma Theory: Global Cold War, and they will provide a new key. You can also contact us, and we’ll help you out.

Delivery times vary by store. For example, in the case of Instatgaming, Eneba, G2a, or Kinguin, delivery is usually instant or takes just a few minutes. These stores rarely delay game deliveries.

Other stores may take 30–40 minutes depending on game availability. On release days, delivery times may be slightly longer.

If you notice an unusually long delay, contact the store or us, and we’ll resolve it as quickly as possible.

At Gocdkeys, we only list the most well-known stores that have passed our quality checks. One of the most important factors is good customer support, and all listed stores offer it.

There have been occasions when those services were overwhelmed, which is why we also offer 24/7 customer support to help resolve any issues or questions.

In any case, we always offer a 100% guarantee, so you won’t have any problems, and if you do, we’ll resolve them as soon as possible.

Need more help? Use our FAQs.

Gocdkeys - Transparency and credibility

At GOCDKEYS we display real prices from 48 verified stores. Some links may be affiliate links, which help us keep the service running at no extra cost to users. Prices and conditions are always exactly the same as those offered by the store. All stores go through our own store verification methodology, so you can buy with complete confidence.

If you have doubts before buying, we explain why CD keys are legal and break down the most common myths and facts about digital games, so you can make your decision with clear and up-to-date information.

More than 4.5M users in 14 years have trusted us to find the best deals — Trustpilot 4.1/5 ★
We compare 48 verified stores where we find the best deals for gamers
24/7 support to help you with any issues in your purchases
We track prices every 2 hours and sort by final cost - Last update: 2026-08-06 18:04:58

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About of Sigma Theory: Global Cold War

Release date	04/22/2019
Users rating	0/5 (0 Comments)
Steam comments	Mostly Positive Mostly Positive (889 Comments)
Categories	Strategy
Tags Strategy Simulation Singleplayer 3D Management Economy Sandbox Moddable Turn-Based Strategy Difficult

Languages

English*, French, German, Russian, Simplified Chinese*languages with full audio support

Reviews

Impulsegamer

Lead your nation to uncover the singularity... at any cost? Read more

Gamersky

Sigma Theory is a cold war spy game and it seems fun at first sight. But only after a few hours, the gameplay becomes repeated... Read more

Requirements

PC
Mac
Linux

Minimum:

OS *: Windows Vista
1,3 GHz CPU
1 GB RAM
NVIDIA GT 440 or AMD Radeon HD 5550 w/ 512 MB
1 GB available space

Recommended:

OS *: Microsoft® Windows® 7
Dual-core 2Ghz CPU
2 GB RAM
DirectX® 10 compliant graphics card
1 GB available space

Minimum:

Mac OS X 10.7
Dual Core 2Ghz
2 GB RAM
Hardware Accelerated Graphics with dedicated memory
500 MB available space

Minimum:

Ubuntu 12.04+
1,3 GHz CPU
2 GB RAM
1 GB available space

How to obtain more tickets

Download our Extesion!

Write a store review!

+15 Tickets

To win the tickets, your email in Gocdkeys must match your email in Discord.

The comment must be original, with a minimum of 250 characters, will be reviewed manually and can take up to 48h to be approved.

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Buy Sigma Theory: Global Cold War CD Key for PC

Share this game

Sigma Theory: Global Cold War Steam Key: compare prices (August 2026)

Recommended

Cheapest

Official store

How much does Sigma Theory: Global Cold War for PC cost right now?

Is it worth buying the Steam Key for Sigma Theory: Global Cold War now or waiting?

Can you activate Sigma Theory: Global Cold War in US?

Why is there such an expensive Sigma Theory: Global Cold War offer?

Most common FAQs when buying Sigma Theory: Global Cold War for PC in digital format:

Need more help? Use our FAQs.

What do our users think of Sigma Theory: Global Cold War for PC Digital?

No comments.

About of Sigma Theory: Global Cold War

Languages

Reviews

Related news

feedburner | 2019-11-22

feedburner | 2019-04-30

Requirements

How to obtain more tickets

Top PC Digital Essentials

Sigma Theory: Global Cold War

Buy Sigma Theory: Global Cold War CD Key for PC

Sigma Theory: Global Cold War Steam Key: compare prices (August 2026)

Recommended

Cheapest

Official store

You still don't have enough tickets!

Product you are redeeming

You have enough tickets!

Product you are redeeming

How much does Sigma Theory: Global Cold War for PC cost right now?

Is it worth buying the Steam Key for Sigma Theory: Global Cold War now or waiting?

Can you activate Sigma Theory: Global Cold War in US?

Why is there such an expensive Sigma Theory: Global Cold War offer?

Most common FAQs when buying Sigma Theory: Global Cold War for PC in digital format:

Need more help? Use our FAQs.

What do our users think of Sigma Theory: Global Cold War for PC Digital?

No comments.

About of Sigma Theory: Global Cold War

Languages

Reviews

Related news

feedburner | 2019-11-22

feedburner | 2019-04-30

Requirements

How to obtain more tickets

Top PC Digital Essentials

Battlefield 6

EA Sports FC 27

Minecraft

GTA 5 - Grand Theft Auto V

Call of Duty: Modern Warfare 4

ARC Raiders

Microsoft Office 365

Windows 11

Robux Gift Card

Windows 10 Professional

FORTNITE V-BUCKS

Microsoft Office 2021

Microsoft Office Home and Business 2024

Windows Server 2025

Valorant Riot Points Card

Related games

Ultimate General Civil War

Men of War: Assault Squad 2 Cold War

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Super World War

Sigma Theory: Global Cold War

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