Compare SIRIUS-4 prices across trusted key stores and find the best deal. Developed by Triumvirate Games. Published by Triumvirate Games. Released on 9/2/2025. Available on PC. Genres: Adventure, Indie, Simulation, Early Access.

An open-world space sim with a story backbone and procedurally generated galaxy - landed in Alpha on day one, so your patience is doing most of the heavy lifting right now.

I want to be straight with you before you spend a single minute on this one: SIRIUS-4 is in Alpha, and the sole user review floating on Steam describes spending their session on a loading screen. That is the review. That is the entire review pool. For a sim-head like me, that data point is the most important number in the spreadsheet right now, and it points squarely at "wait." With that caveat firmly on the table, the concept underneath is genuinely interesting. You play as a contract pilot operating under the Sirius unit, working the fringe territories of human space in the aftermath of a galaxy-wide war. The structural promise is a procedurally generated galaxy, meaning the map reshuffles between runs, and a living traffic ecosystem that populates space lanes with other ships going about their business - routine radio chatter, pilots tracking their own routes, corporate freighters and pirate groups carving out territory. Pirates, religious fanatics, and supranational interstellar corporations are all named as factions you will interact with, and the pitch leans hard on atmosphere: this is supposed to feel like existing inside a world, not just clearing objectives inside a menu. Trading appears to be part of the loop alongside combat, so the fantasy is closer to Elite Dangerous or Freelancer than it is to a pure dogfighter. The structural ambition maps onto a familiar and appealing genre template. Procedural galaxies paired with faction ecosystems and open-ended pilot progression is a formula that works when it is executed well. The plot-orientation is a slight wrinkle - most games in this bracket lean sandbox and let the story emerge organically, so Triumvirate Games threading a scripted narrative through a generated galaxy is an interesting design choice, and one I would genuinely like to see finished. The developer has been upfront that the full release target is end of 2026, with no firm guarantee on that date, and that core gameplay elements are subject to change or removal during Early Access. That is an honest disclosure, but it also means you are buying a roadmap more than a game. For strategy and sim players who are comfortable early-adopting: the faction interaction model and the radio-chatter atmospheric layer are the two systems I would watch closely as development progresses. If the faction AI ends up having real teeth - dynamic territory, memory of your actions, meaningful trade route consequences - this could develop into something worth serious attention. If those systems remain thin props for a story corridor, the procedural galaxy will start to feel like wallpaper. The mod ecosystem is a complete unknown at this stage, though the developer has floated the idea of integrating community-made models and assets, which is an encouraging signal. Right now, though, there is no community to speak of and no reception data to triangulate against. Bottom line: the design vision has merit, the Alpha state does not. Check the update history in three to six months. If the loading screen situation has resolved itself and the faction systems have some flesh on them, this conversation gets more interesting. Right now, the spreadsheet says hold. Diego, Scout Team

SIRIUS-4

SIRIUS-4

Sep 2, 2025Triumvirate Games
GamerScout Says

An open-world space sim with a story backbone and procedurally generated galaxy - landed in Alpha on day one, so your patience is doing most of the heavy lifting right now.

PC
Best Price Available
€4.99
at Steam
Lowest tracked: €4.99
Track this price

GamerScout Verdict

Hold until at least mid-development - promising faction and trading bones, but Alpha-stage bugs and near-zero review data make it a hard recommend today.

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StandardEurope (EU)Steam KeyKey
€4.99
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StandardGlobalSteam KeyKey
€9.11
Priced in EUR by the store
Buy

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Price History

Lowest tracked
€4.9929 Aug 2026
Current best
€4.99
Lowest since we started tracking
Official storesKeyshops
€4.50€6.20€7.90€9.608 Jun1 Jul23 Jul15 Aug6 Sept
8 Jun — 6 Sept
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Screenshots & Media

About SIRIUS-4

I want to be straight with you before you spend a single minute on this one: SIRIUS-4 is in Alpha, and the sole user review floating on Steam describes spending their session on a loading screen. That is the review. That is the entire review pool. For a sim-head like me, that data point is the most important number in the spreadsheet right now, and it points squarely at "wait." With that caveat firmly on the table, the concept underneath is genuinely interesting. You play as a contract pilot operating under the Sirius unit, working the fringe territories of human space in the aftermath of a galaxy-wide war. The structural promise is a procedurally generated galaxy, meaning the map reshuffles between runs, and a living traffic ecosystem that populates space lanes with other ships going about their business - routine radio chatter, pilots tracking their own routes, corporate freighters and pirate groups carving out territory. Pirates, religious fanatics, and supranational interstellar corporations are all named as factions you will interact with, and the pitch leans hard on atmosphere: this is supposed to feel like existing inside a world, not just clearing objectives inside a menu. Trading appears to be part of the loop alongside combat, so the fantasy is closer to Elite Dangerous or Freelancer than it is to a pure dogfighter. The structural ambition maps onto a familiar and appealing genre template. Procedural galaxies paired with faction ecosystems and open-ended pilot progression is a formula that works when it is executed well. The plot-orientation is a slight wrinkle - most games in this bracket lean sandbox and let the story emerge organically, so Triumvirate Games threading a scripted narrative through a generated galaxy is an interesting design choice, and one I would genuinely like to see finished. The developer has been upfront that the full release target is end of 2026, with no firm guarantee on that date, and that core gameplay elements are subject to change or removal during Early Access. That is an honest disclosure, but it also means you are buying a roadmap more than a game. For strategy and sim players who are comfortable early-adopting: the faction interaction model and the radio-chatter atmospheric layer are the two systems I would watch closely as development progresses. If the faction AI ends up having real teeth - dynamic territory, memory of your actions, meaningful trade route consequences - this could develop into something worth serious attention. If those systems remain thin props for a story corridor, the procedural galaxy will start to feel like wallpaper. The mod ecosystem is a complete unknown at this stage, though the developer has floated the idea of integrating community-made models and assets, which is an encouraging signal. Right now, though, there is no community to speak of and no reception data to triangulate against. Bottom line: the design vision has merit, the Alpha state does not. Check the update history in three to six months. If the loading screen situation has resolved itself and the faction systems have some flesh on them, this conversation gets more interesting. Right now, the spreadsheet says hold.

Diego
Diego · Scout Team

Strategy & simulation

Tags

singleplayertier:indieProcedural GalaxyFaction EcosystemStory-Driven SimOpen-World FlightPost-War SettingAlpha StateTrading LoopAtmospheric World

System Requirements

Minimum

OS
Windows 10
Memory
8 GB RAM
Storage
60 GB available space
Graphics
NVIDIA GeForce GTX 1050 Ti 4GB
Processor
Intel Core i5-4670K 3.4GHz

Recommended

OS
Windows 10
Memory
16 GB RAM
Storage
60 GB available space
Graphics
NVIDIA GeForce RTX 2080 SUPER
Processor
Intel Core i7-10700K

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Game Info

Developer
Triumvirate Games
Publisher
Triumvirate Games
Release Date
Sep 2, 2025

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Frequently asked questions about SIRIUS-4

How much does SIRIUS-4 cost?

As of 6 September 2026, the cheapest in-stock offer for SIRIUS-4 is €4.99 at Steam, out of 2 live offers we track across verified key stores. Prices change daily — the table on this page is refreshed continuously.

Where can I buy SIRIUS-4 cheapest?

The lowest in-stock price we track for SIRIUS-4 is €4.99 at Steam (6 September 2026). We compare 2 live offers from verified key stores — the full table with every store and its trust score is on this page.

What platforms is SIRIUS-4 available on?

SIRIUS-4 is available on PC.

When was SIRIUS-4 released?

SIRIUS-4 was released on 2 September 2025.

Who developed SIRIUS-4?

SIRIUS-4 was developed by Triumvirate Games.