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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 €9.91 (no fees, -20%) at Greenmangaming, 20% below the €12.39 (no fees) Steam price · 12 verified stores, 16 offers in stock · Updated 04h 28min ago.

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Official stores
Greenmangaming 4.7 (43.9k)
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€9.91
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Steam 1.8 (3.7k)
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€12.39
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€15.49
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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 €9.91 (no fees) at Greenmangaming, a Steam key, which is 20% under the €12.39 (no fees) it costs on the official store.

With 16 offers across 12 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.

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

That €9.91 (no fees) key is expensive for what it usually costs.

  • Those €9.91 (no fees) are 17% above what it usually costs, measured on the store price.
  • 12 stores sell the Steam Key at the same time, and with that much competition the price moves almost daily.
  • Across the 358 days we have tracked it, it has only been pricier than today on 121 days. The lowest it has ever cost is €3.54.
If you do not need it today, waiting pays off: we have seen it at €3.54 and right now you would pay €6.37 more. We will tell you the day it drops.

Worked out from 1,992 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?

11 of the 16 offers work on US — the Global ones plus the ones issued for your own region.

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 07/10/2026, 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 €9.91 (no fees).
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.

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Sins of a Solar Empire II - Reinforcements

Is it worth it?

Steam
Mostly Positive 109 reviews on Steam
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What the press says

US 7 IT 1

Softpedia

90

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

90

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

80

“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

80

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

About the game

Release date
25 Sep 2025
Genre
Strategy Simulation Tactical
Modes
PvP Multiplayer Singleplayer
Setting
Story Rich Sci-fi Space
Languages
English* French Italian

* languages with full audio

Requirements

Minimum:
  • Requires a 64-bit processor and operating system
Recommended:
  • Requires a 64-bit processor and operating system

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