Single-player games like Siege of Centauri
Below are 18 single-player Steam games similar to Siege of Centauri, 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 Siege of Centauri page.
Ranked picks
- 1
Sins of a Solar Empire: Trinity®
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Centauri.
In Sins of a Solar Empire: Trinity, you are the leader of a civilization embroiled in a galactic war, fighting for the survival of your entire race against relentless foes.
- 2
Ashes of the Singularity: Escalation
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy with Siege of Centauri.
A massive-scale real-time strategy game where you command entire armies on a dynamic battlefield. Conquer multiple worlds across several single-player campaigns; or play with your friends in multiplayer combat.
- 3
There Came an Echo
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Centauri.
There Came an Echo is a real-time strategy game in which the player assumes command of a small squadron, using an advanced voice recognition system to issue orders. It features a character-driven sci-fi narrative that stars Wil Wheaton, Ashly Burch, Laura Bailey, Yuri Lowenthal, and more!
- 4
Supreme Commander: Forged Alliance
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy with Siege of Centauri.
The last days of man are at hand.. Two years after the Infinite War the once great warring nations now lie in ruins, and humanity’s hope for a brighter future is nothing but a bitter memory. A new, seemingly unstoppable enemy, supported by the zealots of The Order, now seeks to eradicate mankind: UEF, Aeon Loyalist, and Cybran alike.
- 5
Colony Siege
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy with Siege of Centauri.
Colony Siege combines the best of RTS and tower defense, including base building, mazing, and unit physics. Defend Earth's remaining colonies using an arsenal of deadly weapons to torch, slice, throw, and impale swarms of alien invaders.
- 6
Stronghold Crusader HD (2012)
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy with Siege of Centauri.
The highly anticipated sequel to the best-selling Stronghold, Stronghold Crusader HD throws you into historic battles and castle sieges from the Crusades with fiendish AI opponents, new units, 4 historical campaigns and over 100 unique skirmish missions.
- 7
Element TD 2 - Tower Defense
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Centauri.
Element TD 2 sees you combine powerful elements to create unique towers. Prove your defenses against challenging foes, and compete or cooperate with others to determine who has mastered the elements.
- 8
Sins of a Solar Empire II
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy with Siege of Centauri.
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.
- 9
DG2: Defense Grid 2
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Centauri.
Great strategy is timeless. Build, adapt, and defend across dynamic maps, solo or online - every session brings new strategies, new solutions, and new surprises. Now is the perfect time to enter the grid.
- 10
Aircraft War
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Action and Indie with Siege of Centauri.
Fight against enemy planes with the fun Aircraft War! Challenge your friends with single and double player modes. Conquer the sky, enjoy the victory!
- 11
Command & Conquer™ Generals Zero Hour
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Action and Strategy with Siege of Centauri.
Command & Conquer Generals Zero Hour brings you closer to the enemy than ever before. Engage opposing forces at hot spots around the globe as you match strategies and arsenals against the new masterminds of modern war.
- 12
Ashes of the Singularity II
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy with Siege of Centauri.
In this massive RTS game, command vast armies fighting for control of entire worlds. Control the forces of Earth, the mechanical AI Substrate, or the enigmatic Post-Human Coalition as you battle across the solar system in single player, cooperative multiplayer, or competitive multiplayer.
- 13
Sins of a Solar Empire®: Rebellion
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Action and Strategy with Siege of Centauri.
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.
- 14
Galactic Civilizations III
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy with Siege of Centauri.
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.
- 15
Galactic Civilizations IV
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy with Siege of Centauri.
Take command of a civilization that has just achieved faster-than-light travel in Galactic Civilizations IV, the newest entry in the award-winning space 4X strategy game series. Explore the galaxy, colonize worlds, shape cultures, make alliances, fight wars and pioneer new technologies.
- 16
Star Control®: Origins
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Action with Siege of Centauri.
Star Control is a space role-playing game in which you command Earth's first interstellar starship on a mission to save the Earth from hostile alien empires.
- 17
Fallen Enchantress: Legendary Heroes
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Centauri.
Fallen Enchantress is 4X strategy game from the makers of Sins of a Solar Empire and Galactic Civilizations. Build a civilization in the magical world of Elemental. Recruit heroes, train armies, build cities, forge alliances and save the world in this rich world where it's never the same game twice.
- 18
Galactic Civilizations® II: Ultimate Edition
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Centauri.
Get the complete GalCiv II saga including Galactic Civilizations II: Dread Lords, the expansion pack Dark Avatar, and the newest expansion pack Twilight of the Arnor!