Single-player games like Expansion
Below are 12 single-player Steam games similar to Expansion, 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 Expansion page.
Ranked picks
- 1
Mars Horizon 2: The Search for Life
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
Lead your space agency in The Search for Life in this authentic strategy simulation game. Investigate the solar system and collect evidence of life. Manage base building, rocket designing, launches, and mission planning to Mars and beyond, leading the way in the future of space exploration.
- 2
Starpoint Gemini Warlords
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
Strategy from the front lines! Starpoint Gemini Warlords combines 3rd person capital spaceship combat with 4X strategy and RPG gameplay elements. Build mighty war fleets and send them into battle or lead them into combat yourself. Become the Warlord and conquer the Gemini system!
- 3
Space Tyrant
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
Terrorize the galaxy for fun and profit! Space Tyrant is a surprisingly deep beer & pretzels strategy game set in a darkly humorous future. Build a mighty space force, disintegrate peaceful aliens, and rule irresponsibly on your relentless march to total domination.
- 4
Galactic Civilizations® I: Ultimate Edition
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
Galactic Civilizations is a space based strategy game in which you are in control of humanity's destiny.
- 5
X3: Reunion
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
X3: Reunion continues the epic space saga, blending deep space trading and intense real-time combat. Explore a vast universe, establish your empire, and shape the new frontier. With enhanced graphics and intricate economies, it's a journey of strategy, simulation, and interstellar intrigue.
- 6
The Last Federation
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
From the creators of AI War: Fleet Command comes an all-new grand strategy title with turn-based tactical combat, set in a deep simulation of an entire solar system and its billions of inhabitants. You are the last of a murdered race, determined to unify or destroy the 8 others.
- 7
Gemini Wars
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
Take control of a fleet commander returned from exile, rise through the ranks of the United Space Federation forces and join an epic war across the stars.
- 8
Battlestar Galactica Deadlock
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
In Battlestar Galactica Deadlock™ you’ll take command of the Colonial Fleet in defense of the Twelve Colonies during the First Cylon War. Lead many different types of ships in this 3D tactical game. Every decision counts, your strategy will be vital – can you ensure mankind’s survival?
- 9
Void Monsters: Spring City Tales
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
Avenge your parents' death by becoming the greatest monster trainer of all time!
- 10
Fantasy Hero Manager
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
Recruit and manage a party of self-aware heroes in a quest to find the legendary land of Vrool and the Fountain of Eternal youth!
- 11
Gods of Havoc: Into the Void
Single-player alternative to Expansion — playable solo, no multiplayer required. Shares Strategy with Expansion.
Gods of Havoc heralds a return to the classic God-Game: watch as your worshippers spread across the galaxy; guide their destiny through dreams; shape their worlds with magic; destroy their enemies with devastating spells; and manipulate space for their advantage! An intense and cunning strategy game. Part of the 'Gods of Havoc' Trilogy!
- 12
Void Monsters 2: The Blight
Single-player alternative to Expansion — playable solo, no multiplayer required.
Summon and train hundreds of unique monsters, and build a party strong enough to turn back The Blight.