Single-player games like Imperium Galactica
Below are 17 single-player Steam games similar to Imperium Galactica, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Imperium Galactica page.
Ranked picks
- 1
Imperium Galactica II
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
Reintroducing a classic from the golden era of gaming, the original empire building space RTS, Imperium Galactica 2 is back and looking better than ever with new high-res textures and vivid colors.
- 2
Stellaris
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
Explore a galaxy full of wonders in this sci-fi grand strategy game from Paradox Development Studios. Interact with diverse alien races, discover strange new worlds with unexpected events and expand the reach of your empire. Each new adventure holds almost limitless possibilities.
- 3
Master of Orion 2
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
Forge an empire in a universe where population growth is stripping away planetary resources. Colonize unknown planets and trade with other races for their knowledge.
- 4
Horizon
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
Horizon is a turn-based space strategy game of galactic exploration and conquest in which you are in control of humanity’s destiny. You will explore deep space, find new frontiers and discover alien artifacts hidden on long-abandoned planets.
- 5
Galactic Civilizations III
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
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.
- 6
Space Empires IV Deluxe
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
The award-winning Space Empires IV Deluxe is the latest edition in the Space Empires series. A grand strategy title in the space 4X (explore, expand, exploit, and exterminate) genre, Space Empires has already found a place in the heart of strategy gamers everywhere.
- 7
Emperor of the Fading Suns Enhanced
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
Command interstellar forces in this epic return of the 4X strategy classic. From planetary politics to galactic warfare, the stakes couldn’t be higher as you lead your Royal House through battles on land, sea, air, and the vast reaches of space.
- 8
ENDLESS™ Space - Definitive Edition
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
ENDLESS™ Space is a turn-based 4X strategy game, covering the space colonization age in the ENDLESS™ Universe, where you can control every aspect of your civilization as you strive for galactic domination.
- 9
Master of Orion
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
The ascendant spacefaring 4X strategy game returns! A new chapter in the epic Master of Orion saga is poised to once again capture the imaginations of millions of gamers.
- 10
Nexus - The Jupiter Incident
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
Ambitious megacorporations monopolize the conquest of space and the colonization of the solar system. At the very edge of the solar system, the companies make a discovery that will shift the technological advantage and upset the balance. And so a new conflict is born: "The Jupiter Incident."
- 11
Haegemonia: Legions of Iron
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
From the makers of the award-winning Imperium Galactica 1 and 2 games, discover a powerful space-opera like RTS game.
- 12
Dune War
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
Explore the desert. Mine rare crystals. Build your base. Survive the machine assault. Dune War features a single-player intro campaign and an endless high-score mode where every run is a fight over who control the dunes.
- 13
SkyDrift
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required.
Get closer than ever before to the world of adrenaline pumping sky-racing where flyboys can test and master their flying and combat skills against the deadliest opponents! Admire amazingly detailed terrains. Unlock state-of-the-art planes and personalize them with unique racing skins.
- 14
Sine Mora
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required.
Sine Mora is a horizontal shoot'em up that provides a unique take on challenge, where time is the ultimate factor.
- 15
Sine Mora EX
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required.
Sine Mora EX is a side-scrolling shoot'em up that provides a unique challenge, where time is the ultimate factor. Mixing classic shooter sensibilities with contemporary presentation, Sine Mora EX is a gorgeous shoot'em up offering both a Story Mode that weaves an excessive tale and an Arcade Mode.
- 16
Haegemonia: The Solon Heritage
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica.
A stand-alone expansion pack to Legions of Iron, discover new innovations and even more stunning visuals that launch the Haegemonia experience into light speed.
- 17
Skydrift Infinity
Single-player alternative to Imperium Galactica — playable solo, no multiplayer required.
Skydrift Infinity is an action-packed arcade game focusing on the experience of flying alone, and with others, in a light, quick, fast-paced style.