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Imperium

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Imperium screenshot 1
Imperium Official Trailer trailerWatch trailer on Steam ↗

Imperium

Petroff Games · Published by Petroff Games · Official site ↗

Last updated 19 Sept 2026

Imperium is a single-player 4X space strategy game. Colonize alien worlds, design your own spaceships, research exotic technologies, and outmaneuver rival empires through diplomacy or open war. Build a galactic empire and rule it your way.

Free to PlayComing SoonDJCTQ l

Free

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Prices can lag the live Steam store — always confirm before buying.

Indie, Simulation, Strategy · 2026 · More free games

About this game

Imperium is a single-player 4X space strategy game about building a civilization among the stars. Begin with one colony and a single home star, then expand across a galaxy of alien worlds — researching exotic science, designing your own fleets, and bending rival empires to your will through diplomacy or open war. Every game generates a new galaxy, a new balance of power, and a new empire to call your own.

Colonize a Living Galaxy

  • Explore procedurally generated galaxies ranging from a dozen systems to well over a hundred.
  • Settle planets, moons, and asteroids — each with a surface you develop tile by tile.
  • Construct more than 50 surface structures and orbital installations: factories, laboratories, hydroponic gardens, defense towers, embassies, and more.
  • Terraform hostile worlds and uncover ancient ruins left behind by a vanished civilization.

Design Your Own Fleets

  • Engineer warships from the keel up across five hull classes, from nimble scouts to colossal capital ships.
  • Combine more than 90 components — power cores, drives, scanners, shields, and an arsenal of exotic weaponry.
  • No two commanders fly the same fleet. Two players using identical hulls can wage completely different wars.

Research Exotic Technologies

  • Advance through a tech tree of more than 60 technologies, from your first orbital shipyard to galaxy-spanning megastructures.
  • Harness serious, far-future science: gravity manipulation, frequency-based weaponry, and exotic physics.
  • Crown your empire with mega-projects — encircle a star with a Dyson Sphere, or bridge the void with a Starlane Gate.

Rule Through Diplomacy or War

  • Share the galaxy with 21 playable species — Veylilith, Phasaryn, Oculari, Litharrak, and many more — each with its own homeworld, fleet aesthetic, soundtrack, and signature ability.
  • Negotiate non-aggression pacts, trade agreements, and full alliances — or declare war and take what you want by force.
  • Establish embassies and build diplomatic influence across rival courts.
  • Outthink rival empires driven by distinct AI personalities and strategic postures that scheme, expand, and fight in character.

Claim Victory Your Way

  • Triumph through military elimination, territorial supremacy, conquest of every home star, or by forging a galactic alliance.
  • Shape every playthrough: choose your galaxy size, the number of rival empires, and the temperament of the galaxy itself.

Crafted to Be Played

  • A deep 4X wrapped in a clean, modern interface — atmospheric visuals and a sci-fi soundtrack.
  • Characterful AI that makes every rival empire feel like an opponent worth beating.
  • Built-in modding tools let you reshape the tech tree and redesign the game's items.

A galaxy is waiting. Make it an Imperium.

System Requirements

Will my PC run this? →

Minimum

Minimum:
  • OS: Windows 10 64-bit
  • Processor: Intel Core i5-4460 / AMD FX-8350
  • Memory: 4 GB RAM
  • Graphics: Vulkan 1.0 GPU, 2 GB VRAM (GTX 950 / R7 370)
  • Storage: 2 GB available space
  • Sound Card: Any

Recommended

Recommended:
  • OS: Windows 11 64-bit
  • Processor: Intel Core i7-8700 / AMD Ryzen 5 3600
  • Memory: 8 GB RAM
  • Graphics: GTX 1060 6GB / RX 580
  • Storage: 2 GB available space
  • Sound Card: Any

Supported Languages

English

Latest news

  • AnnouncementsOfficial

    The Imperium demo is live!

    The free demo is up on Steam right now, ahead of Next Fest.What's in it: a small galaxy, 3 AI opponents to out-build or out-fight, and three playable species (Veylilith, Throk, Zyyth Azr) to start your empire with. It's capped at year 1500 so you can see a full early-to-mid game arc without a Q4 launch spoiling itself.The full game underneath is 21 playable species, ships built component-by-component across 5 hull classes, a 68-tech web, and diplomacy that runs as a real economy - embassies, espionage, treaties, and a Galactic Senate you can get elected Premier of.Download it, break it, tell me what you think - bugs, balance, first impressions, all of it. I read everything here and on Discord.Wishlist link if you want to be notified at launch: Thanks for being here this early.
    Read full article on Community Announcements (PetroffGames)
  • Community & EventsOfficial

    Announcement Trailer & See You at Steam Next Fest in October

    Imperium is a single-player 4X space strategy game: colonize alien worlds, design your fleets component by component, research exotic technologies, and outmaneuver rival empires through diplomacy or war. Every game generates a new galaxy - and a new empire to call your own.🎬 Watch the trailer on the store page above, or on YouTube.🚀 What's next:October 19–26 - Steam Next Fest: free playable demo, and I'll be around all week for feedback and questionsFull release - coming shortly after the fest. If Imperium looks like your kind of galaxy, add it to your wishlist - it genuinely helps a solo developer more than you'd think, and you'll get pinged the moment the demo and the release go live.Want to talk 4X or follow development? Join us on Discord.- Daniel, Petroff Games
    Read full article on Community Announcements (PetroffGames)

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