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
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.
- 2
Act of Aggression - Reboot Edition
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Centauri.
Act of Aggression – Reboot Edition brings the techno-thriller RTS game Act of Aggression to a higher level. The Reboot Edition offers a full gameplay overhaul in skirmish mode against the AI and in your multiplayer battles.
- 3
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.
- 4
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.
- 5
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.
- 6
Taur
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Action and Strategy with Siege of Centauri.
Taur is an action-strategy sci-fi game. Control the Prime Cannon and unlock all of its powerful weapons and abilities. Build turrets, droids, aircraft and more as you fight to protect the homeworld of the Tauron droids against a relentless invasion. Will your Taur stand against the Imperion warmachine?
- 7
AI War 2
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Centauri.
The most devious and acclaimed artificial intelligence in strategy gaming is better than ever. A grand strategy/RTS hybrid that reverses many conventions of both genres. Take territory without attracting attention, build your empire with care, and adapt to an ever-evolving galactic battleground.
- 8
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.
- 9
Warframe
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Action with Siege of Centauri.
Awaken as an unstoppable warrior and battle alongside your friends in this story-driven free-to-play online action game
- 10
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.
- 11
GRID DEFENSE: GRID WAR
Single-player alternative to Siege of Centauri — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of Centauri.
Build towers, unleash ultimates and command six heroes in sci-fi tower defense. Play all 100 Scenario stages free. Try one-minute highlights of Basic and GRID COMMAND before purchase, then take your aerial fleet into GRID COMMAND's survival battles.
- 12
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.
- 13
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.
- 14
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.
- 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!