Build a civilization that will stand the test of time in the largest space-based strategy game ever! Choose from dozens of unique races and make a name for yourself across the galaxy through diplomacy, espionage, technological advances, and more.
Recent Reviews:
Mixed (28) - 46% of the 28 user reviews in the last 30 days are positive.
All Reviews:
Mostly Positive (5,735) - 76% of the 5,735 user reviews for this game are positive.
Release Date:
May 14, 2015

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Packages that include this game

Buy Galactic Civilizations III

Includes 3 items: Galactic Civilizations III, Galactic Civilizations III - Mega Events DLC, Galactic Civilizations III: Crusade Expansion Pack

Buy Stardock Pack 2018

Includes 9 items: Ashes of the Singularity: Escalation, Ashes of the Singularity: Escalation - Co-Op Map Pack, Ashes of the Singularity: Escalation - Juggernaut DLC, Galactic Civilizations III, Galactic Civilizations III - Builders Kit DLC, Galactic Civilizations III - Map Pack DLC, Offworld Trading Company, Offworld Trading Company - Almanac DLC, Sins of a Solar Empire®: Rebellion


Recent updates View all (89)

March 20

Galactic Civilizations III v3 Preview: Strange new worlds

There are thousands of alien planets in Galactic Civilizations III, but not all of them are safe to colonize. Extreme worlds can be found all through the galaxy, and in v3.0 we're adding some new ones.

Want to know more? Check out this week's dev diary. If you could visit any planet in our solar system, where would you want to go? Share your thoughts with us!
12 comments Read more

February 8

Stronger, smarter, faster - v2.8 for Galactic Civilizations III brings major AI improvements

AI for the massive-scale space strategy game now more human-like thanks to v2.8's "supreme commander" system update

For a complete list of changes, see the changelog at the bottom of the post!

What’s New in v2.8:

v2.8 leverages one of the greatest advantages of Galactic Civilizations III: its new, 64-bit, core-neutral game engine. Since most PC gamers have at least 4 CPU cores, we took the opportunity to develop a semi-genetic algorithm based AI that allows the computer to play much more like a human would.

GalCiv III is already known for its good computer opponents. To continue creating new depth of experience for our playerbase, the new asynchronous “supreme commander” AI will observe and send priorities for computer empires, which will feel much more like playing against another human.

We want players to have lots of viable strategic choices. To that end, we have been making lots of balance updates over the past year. v2.8 will help players play as a “tall” empire as well as a “wide” empire by giving them the potential to tilt the balance of the galaxy through smaller empires and well-run nation states.

The final focus of the new update has been in the ongoing drive to make the game more approachable without sacrificing its celebrated depth. A number of new UI elements to streamline gameplay, additional in-game descriptions, and more. Some changes are minor improvements, like moving rarely-used features to a different place, but other changes like defense modifications for ships will make the game even more intuitive and satisfying.

v2.8 Changelog
  • Required starbase spacing reduced from 4 to 3.
  • Balance pass on defenses based on new combat update that makes defenses a lot more worthwhile.
  • Updated AI ship blueprints to reflect the changes to the battle system.
  • Pacing improvements for the Crusade tech tree.
  • Fixed typo.  Near bay Nearby ships.
  • Industrial Sector maint reduced from 2 to 1
  • Recruit Celebrity requires an Aurorus Arbortetum instead of Helios Ore because, uh, why would any celebrity be interested in raw ore? How does that even work? Hey, famous movie star, here's some metallic ore for you. Please do a USO tour. Because... you know, you'll get some ore!  As the famous saying goes, you will attract more celebrities with flowers than...ore.
  • Fixed shipyard window to always show the military production generated by the sponsors regardless of if there's a ship in the build queue or not
  • Fixed issue in influence system where it was displaying "Foreign ship in your ZOC" alerts for ships owned by allied players
  • Torians can once again increase their population cap (opt-in bug)
  • Restored missing improvement and tech text that was missing from the opt-in.
  • Commander ships are no longer stackable in a fleet
  • Mega Resort -- changed the bonus from +25% bonus to a flat +4.
  • Financial buildings now provide +1 to influence growth
  • Major boost to defenses: Defenses are now reduced by the squareroot of damage rather than full damage making defenses much better.
  • Base Research Lab returned to base game
  • Cultural Festival now requires Cultural Influence
  • Peacekeeper event won't trigger until at least turn 200 (instead of 100)
  • Defenses on Peacekeepers reduced so that they can be worn down faster.
  • "Go to" renamed to Auto Pilot.
  • More AI research focus attention
  • AI improvements to planetary improvement choosing.
  • Cosmetic change to the FOW color.
  • Cosmetic change to the size of ships on the main map.
  • Cosmetic change to the starbox visuals.
  • When receiving messages from a Civ, it names the Civ in the title bar.
  • Added tooltips to the various "idle" button states.
  • Added tooltip support for notifications.
  • Clarified message for insufficient population to eject a colony ship.
  • Crash fix in the event that the AI can't negotiate with another AI for a tech trade.
  • Fixed AI related multiplayer desync bug  
  • AI better at early game administration resource and late game invasion legions
  • Upgrading to a ship to a colony ship class penalty increased.
  • You can no longer colonize planets with empty colony ships.  This also addresses a problem where the Yor AI could quickly colonize the entire galaxy.
  • You can no longer launch colony ships from a starbase without population
  • AI now will adjust how big its fleets need to be based on the assignment of the fleet.  Thus, scouts and survey ships don't need escorts while mega fleets now need larger fleets.
  • AI smarter at picking quality ship designs.
  • AI much better at going after key technologies based on the conditions of the game
  • Streamlined the base game tech tree.
  • Tweaked the AI fleet governor to use defenders.
  • Adjusted the culture tree to be more in line with the planetary improvements
  • Set default colony ship population to 1.0
  • Minimum population for colony ships increased from 0.5 to 1.
  • Decreased the spacing between civilization starting positions and pirates
  • Base game laser weapon now comes with Militarization tech.
  • Nerfed several of the crazy Lost Treasures DLC rewards
  • Navigation Center is now a Galactic Wonder
  • Eliminated ship moves going up based on the level of certain planetary improvements
  • Galactic Navigation Center global moves decreased from 3 to 1 (yeeesh!) ...and it now longer provides an additional 0.5 points per level! (double yeesh!)
  • Galactic Navigator's Guild benefit reduced from providing 4 moves per turn to 1! ...and it no longer provides an additional 0.5 points per level in moves!
  • Galactic Mainframe research bonus increased from 0.3 to 0.5
  • Starport level benefit increased from 0.5 to 1
  • Synthetic Race population increase Promethion cost reduced from 10 to 1
  • Synthetic Race population increase Duranitum cost reduced from 5 to 1
  • Synthetic Race population increase improvement increases by 0.5 instead of 1
  • Changed default invasion from 1 legions to 2.
  • Base Game: Custom factions with the "Raider Ship Style" will now get the proper ships awarded by events and anomalies.
  • Fixed crash in battle tooltip if privateer is stationed by itself in a starbase or shipyard
  • Fixed several improvements tooltips that were saying they were both "one per player" and "one per galaxy"
  • Fixed typos and sTough
  • Added dialog if the game fails to start because the graphics driver fails to initialize.  This is usually caused by out-of-date drivers.  
29 comments Read more


“The new gold standard in 4X space strategy”
9/10 – GameWatcher

“Such a wealth of victory conditions and customization options that the experience feels new with every playthrough.”
8.6/10 – IGN

“A mix of familiar mechanics and new ideas that can keep both fans and newcomers occupied for a frighteningly long period of time.”
9/10 – Softpedia

About This Game

What if one day, humans woke up to find that they weren’t alone in the galaxy? They make their way into space and discover other alien civilizations with their own histories and motivations looking to make a name for themselves. Choose your race - Human, Drengin, Altarian, and so many more - and lead your civilization into a golden age in one of the largest 4X strategy games ever made!

Research new technology, design starships, and colonize new worlds as you face threats and conquer challenges from new and mysterious sources. Negotiate trade and treaties, wage wars, spy on your enemies, and promote outstanding citizens. And when you've finished that, play again as one of the many included alien civilizations each with its own history, technology tree, ship components, and more.

Galactic Civilizations III now bundles in the Crusade expansion and Mega Events add-on content for an even greater gameplay experience! Join the ranks of galactic leaders today, and answer the question: how will you rule your galaxy?


Each new game offers an array of options as you set it up - choose your map size, abundance of planets and resources, frequency of events, and more for a unique play experience every time. Galactic Civilizations III also removes linear victory conditions and offers you multiple objectives that you can choose to pursue in order to win, such as military conquest, cultural domination, technological ascension, or political alliances. The new multiplayer capabilities also allow you to expand your challenges and fights beyond an AI in order to face off against fellow players. All of this, topped with a rich and in-depth custom ship designer ensure an immersive and exciting experience as you decide how to rule your galaxy.


  • The ultimate sandbox experience: Each game has a unique map, worlds, and challenges to face -- all on a massive scale. Play against 16 to 100 opponents.
  • Multiple paths to victory: Win through military conquest, cultural domination, technological ascension, or political alliance.
  • Create your own history: Each sandbox game lets you create a new future history for your civilization.
  • Story-based campaign: Learn the ancient histories of the alien civilizations and one possible future for the human race.
  • Massive technology tree: Research a technology tree with immense breadth and depth. Each playable faction has their own unique specializations. Your choice determines how you play and win.
  • Faction & Ship Customization: Create a civilization with its own look, ships, technologies, and even options for how the AI will use them.
  • Multiplayer: Play online with friends with full support for custom civilizations, saved multiplayer games, and much more.
  • A deep economy: Every world is unique with many different resources that can change the course of your strategy each game.
  • Planetary Governors: Utilize individual planetary leaders to govern your worlds, deciding what improvements to build and when, which leaves you to focus on larger strategic goals.

  • Civilization Builder: Create a custom faction complete with leader, ideology, and abilities. Customize your own galactic navy and create unique dialogue for your faction.
  • Invasions: Train your citizens to be soldiers and invade enemy worlds. Carefully plan your attacks, and don’t forget to leave your homeworld defended, too!
  • Espionage: Spies can steal technologies, circulate rumors to create civil unrest, sabotage enemy worlds, or even go so far as to assassinate enemy citizens.
  • Galactic Citizens: Shape the course of your civilization’s destiny with talented individuals called citizens. Choose from over a dozen unique roles - commander, engineer, farmer, celebrity, and more.

  • Complex Decisions: Use skill and strategy to overcome unexpected challenges
  • Galaxy-wide Events: Deal with issues on a galactic scale
  • Guide your Civilization: Comfort your people through assassinations of beloved leaders, choose how to handle the discovery of a mysterious alien artifact, face down the Dread Lords, and more.

System Requirements

    • Requires a 64-bit processor and operating system
    • OS: 64-bit Windows 10 / 8.x / 7
    • Processor: 1.8 GHz Intel Core 2 Duo / AMD K10 Dual-Core
    • Memory: 4 GB RAM
    • Graphics: 512 MB DirectX 10.1 Video Card (AMD Radeon HD5x00 Series / Nvidia GeForce 500 Series / Intel HD 4000 or later)
    • DirectX: Version 10
    • Network: Broadband Internet connection
    • Storage: 12 GB available space
    • Sound Card: DirectX Compatible Sound Card
    • Requires a 64-bit processor and operating system
    • OS: 64-bit Windows 10 / 8.x / 7
    • Processor: 2.3 GHz Intel Core i5 Processor or Equivalent
    • Memory: 6 GB RAM
    • Graphics: 1 GB DirectX 10.1 Video Card
    • DirectX: Version 10
    • Network: Broadband Internet connection
    • Storage: 15 GB available space
    • Sound Card: DirectX Compatible Sound Card
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