Single-player games like Imperium Galactica II
Below are 20 single-player Steam games similar to Imperium Galactica II, 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 II page.
Ranked picks
- 1
Imperium Galactica
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
Imperium Galactica. The Universe is yours... if you can handle it. The fourth millennium. Mankind has colonised the galaxy. Created an Empire. Now, it is crumbling. The aliens are restless. The oppressed are building armies. And a strange invader is headed for the heart of the Empire.
- 2
Galactic Civilizations III
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
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.
- 3
Sins of a Solar Empire®: Rebellion
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
Command a space-faring empire in Sins of a Solar Empire: Rebellion, the new stand-alone expansion that combines 4X depth with real-time strategy gameplay.
- 4
Stellaris
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
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.
- 5
Emperor of the Fading Suns Enhanced
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
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.
- 6
Sword of the Stars: Complete Collection
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
Sword of the Stars: Complete Collection is the original Sword of the Stars games and the three expansions Born of Blood, A Murder of Crows and Argos Naval Yard. It is the year 2405, and human scientists have discovered a new technology that allows travel from star to star at speeds faster than light.
- 7
Battlefleet Gothic: Armada 2
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
Battlefleet Gothic: Armada 2 is the new real-time strategy game adapted from Games Workshop’s famous tabletop game that portrays the epic space battles of the Warhammer 40,000 universe.
- 8
ENDLESS™ Space 2
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
ENDLESS™ Space 2 is a Strategic Space Opera, featuring the compelling “just one more turn” gameplay, set in the mysterious ENDLESS™ Universe. As the leader of your civilization, will you impose your vision and build the greatest stellar empire?
- 9
Master of Orion
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
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
Master of Orion 2
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
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.
- 11
Total War: WARHAMMER II
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
Strategy gaming perfected. A breath-taking campaign of exploration, expansion and conquest across a fantasy world. Turn-based civilisation management and real-time epic strategy battles with thousands of troops and monsters at your command.
- 12
Command & Conquer™ Remastered Collection
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
Command & Conquer and Red Alert are both remastered in 4K by the former Westwood Studios team members. Includes all 3 expansions, rebuilt multiplayer, a modernized UI, Map Editor, bonus footage gallery, and over 7 hours of remastered music.
- 13
Total War: SHOGUN 2
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
Total War: SHOGUN 2 is the perfect mix of real-time and turn-based strategy gaming for newcomers and veterans alike.
- 14
Sins of a Solar Empire II
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
Battle for galactic dominance in this real-time 4X strategy game with unrivaled scale! You’ll explore, expand, exploit, and exterminate through military force, diplomacy, trade, culture, influence, and other underhanded tactics.
- 15
SkyDrift
Single-player alternative to Imperium Galactica II — 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.
- 16
Sine Mora
Single-player alternative to Imperium Galactica II — 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.
- 17
Sine Mora EX
Single-player alternative to Imperium Galactica II — 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.
- 18
Haegemonia: Legions of Iron
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
From the makers of the award-winning Imperium Galactica 1 and 2 games, discover a powerful space-opera like RTS game.
- 19
Haegemonia: The Solon Heritage
Single-player alternative to Imperium Galactica II — playable solo, no multiplayer required. Shares Strategy with Imperium Galactica II.
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.
- 20
Skydrift Infinity
Single-player alternative to Imperium Galactica II — 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.