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Buy Sins of a Solar Empire II - Reinforcements Steam Key

Q: Why is the Steam Key of Sins of a Solar Empire II - Reinforcements 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 Sins of a Solar Empire II - Reinforcements to your game library. The account format requires more complicated steps and is more prone to errors during activation.

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Sins of a Solar Empire II - Reinforcements Steam Key: compare prices (August 2026)

A Sins of a Solar Empire II - Reinforcements 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 €3.07 (-80%) at Difmark Digital Keys, 80% below the €15.49 Steam price · 10 verified stores, 11 offers in stock · Updated 56min ago.

Gift cards

Cheapest

€3.66 €3.07 -80% Save €12 vs Steam View deal

Gocdkeys

-16%

Copied!

Steam Key

Official store

€15.49 View deal

No code available

See 12 keys from €3.07

Historical prices

Medium price

Current minimum price

Reinforcements prices: 11-month price history →

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”

Editions Standard

Format Steam Key

Global EU US UK

Official stores 5 stores Hide Accounts

Resellers

No payment fees With payment fees Basic price Fees incl.

Promoted store

Difmark Digital Keys 4.1 (14.2k)

Coupon

Gocdkeys -16%

Copied!

€3.66 €3.07

Store Difmark Digital Keys

Region Global

Product type Steam Key

Edition Standard

Fees +€0.26

YUPLAY
Eneba
Driffle
K4G
G2A

YUPLAY 4.8 (2.5k)

Product type Steam Key

Eneba 4.4 (312.9k)

€6.87 €6.18 How to get this priceHow to get

Store Eneba

Region Europe

Product type Steam Key

Eneba 4.4 (312.9k)

€9.34 €8.41 How to get this priceHow to get

Store Eneba

Region Global

Product type Steam Key

Edition Standard

Fees +€0.72

Driffle 4.4 (9.2k)

Subscription from 4.99€/month

€12.15 €10.94

Product type Steam Key

K4G 4.3 (17.6k)

€13.55 €11.65

Product type Steam Key

Edition Standard

Fees +€1.49

G2A 4.0 (346.2k)

No code available

€13.97 How to get this priceHow to get

Store G2A

Region Global

Product type Steam Key

Edition Standard

Fees +€0.04

Official stores

Greenmangaming
GamesPlanet
Fanatical
GamersGate
Steam

Greenmangaming 4.7 (43.9k)

No code available

€9.91

Store Greenmangaming

Region Global

Product type Steam Key

Edition Standard

Fees -

GamesPlanet 4.3 (629)

No code available

€11.53

Store GamesPlanet

Region Global

Product type Steam Key

Edition Standard

Fees +€1.29

Fanatical 4.6 (78.7k)

Product type Steam Key

GamersGate 3.6 (527)

Product type Steam Key

Steam 1.8 (3.7k)

Product type Steam Key

Edition Standard

Fees -

About Sins of a Solar Empire II - Reinforcements

With the conflict between the TEC, Advent and Vasari forces rushing towards a climax, new warships are being called into action. Each sub-faction has deployed dynamic new command ships to help redefine their fleet compositions. These massive new units are deployed from a titan factory and easily dwarf regular capital ships.

Command-Class Ships

TEC Enclave – Takadaran Command Fortress: A massive support platform doubling as a mobile cruiser-scale shipyard, capable of producing TEC cruisers in the field.
TEC Primacy – Khevarkov Modular Battleship: A high-speed strike vessel with customizable hardpoints for railguns, missiles, or hangar bays.
Vasari Alliance – Sularkon Tyrant: A city-ship fortress with integrated Phase Gate, designed to lock down entire sectors.
Vasari Exodus – Anarkrul Wanderer: A colossal refugee-carrier turned warship, bristling with defenses and heavy strikecraft support.
Advent Wrath – Oblivia Dreadnought: A heavily armored frontline warship wielding a devastating Super Heavy PsiKinetic Lance.
Advent Reborn – Justicia Dreadnought: A vertical dreadnought that grows deadlier as allies fall, culminating in catastrophic retaliation.

Factional Victory Conditions

In addition to new units, the Reinforcements DLC includes three new Factional Victory Conditions to better customize your gameplay:

Vasari – The Departure: Build massive Vasari command ships and escape the sector through a star.
Advent – Mass Conversion: Use your command ship dreadnoughts to transform entire star systems into loyal territory in sweeping waves.
Trader Emergency Coalition – Super Novalith Offensive: Construct the ultimate Novalith cannon capable of obliterating planets to force peace through sheer destructive power.

How much does Sins of a Solar Empire II - Reinforcements for PC cost right now?

Sins of a Solar Empire II - Reinforcements for PC starts at €3.07 at Difmark Digital Keys, a Steam key, which is 80% under the €15.49 it costs on the official store.

That €3.07 already includes the Gocdkeys coupon, so apply it at checkout or the store will show you a higher price.

Supply is thin — 11 offers from 10 stores — and thin supply keeps prices steady rather than falling.

It is €0.12 away from its all-time low (€3.54, back in July 2026).

Is it worth buying the Steam Key for Sins of a Solar Empire II - Reinforcements now or waiting?

That €3.07 key is at one of its best prices.

Those €3.07 are 60% below what it usually costs, measured on the store price.
10 stores sell the Steam Key at the same time, and with that much competition the price moves almost daily.
Not counting today, the lowest we have recorded for the Steam Key across 318 days is €3.54, and today it sits exactly there.

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 1,480 daily records of the Steam Key for Sins of a Solar Empire II - Reinforcements across 14 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 Sins of a Solar Empire II - Reinforcements in US?

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

Why is there such an expensive Sins of a Solar Empire II - Reinforcements offer?

One listing is worth ignoring: the Steam key that Steam has at €15.49 is more than 5 times the cheapest offer and is not what this game costs. The number to work from is €3.07 at Difmark Digital Keys.

Most common FAQs when buying Sins of a Solar Empire II - Reinforcements for PC in digital format:

It is a key that will allow you to download the game Sins of a Solar Empire II - Reinforcements on your PC from official download platforms.

As of 27/08/2026, in United States, the best price we have found in our selection of online stores that include the key for Sins of a Solar Empire II - Reinforcements on PC is €3.07.

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 Sins of a Solar Empire II - Reinforcements 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 Sins of a Solar Empire II - Reinforcements, 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 49 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 49 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: 2026-08-27 12:01:47

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What the press says

Softpedia

Sins of a Solar Empire II is a great space-based real-time strategy game. It is designed to primarily appeal to those who liked the original,... Read more

Gaming on PC

Sins of a Solar Empire 2 is a more than worthy follow-up to the acclaimed 2008 original, offering a noticeable visual glow-up, but also improving... Read more

Saving Content

“Sins of a Solar Empire II” is more than capable of standing on its own even without a proper campaign. It already has great features,... Read more

GameLuster

Stardock Entertainment and Ironclad Games bring us a worthy sequel which dazzles the eyeballs and challenges the tactical skills of 4X players everywhere. Only the... Read more

IGN

Sins of a Solar Empire 2's spectacular space battles are an excellent reward for learning to manage at least some of this complex real-time strategy... Read more

PCGamesN

Sins of a Solar Empire 2's frantic, always real-time pace is both a thrill and a significant hurdle. Its banal space-opera vibes and even worse... Read more

NoobFeed

Sins of a Solar Empire II is a simplified Stellaris, and it is damn good at what it does right. With its many, many flaws,... Read more

The Games Machine

Sins of a Solar Empire 2 burrows a few aspects from the 4X genre, but it's mostly a very focused strategic game where war is... Read more