Single-player games like Mars Colony Builder
Below are 12 single-player Steam games similar to Mars Colony Builder, 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 Mars Colony Builder page.
Ranked picks
- 1
SpaceSlog
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required. Shares Strategy with Mars Colony Builder.
Build your spaceship, manage your crew, and explore the cosmos whilst trying to keep your crew alive and your ship fully functioning. This game features simulated ship systems and a lived in universe which creates a challenging, unique and unforgettable experience with every playthrough.
- 2
Corsair Cove
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required. Shares Strategy with Mars Colony Builder.
Build a sprawling pirate haven, raise a fleet to explore the high seas, and take on the Crown to keep the Age of Piracy alive! From ale to flintlock pistols, and from scallywags to swashbucklers, you’ll need to manage complex production chains and govern a rowdy crew to reign supreme over the seas!
- 3
Maia
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required. Shares Strategy with Mars Colony Builder.
Maia is a colony building game set in the not-so-distant future. Your colonists make planetfall on a hostile world and you must ensure their survival and their safety, constructing their off-world habitat from almost nothing and sheltering them from a dangerous, often deadly environment.
- 4
Planetbase
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required. Shares Strategy with Mars Colony Builder.
Guide a group of space settlers trying to establish a base on a remote planet. Grow food, collect energy, mine resources, survive disasters and build a self-sufficient colony in a harsh and unforgiving environment.
- 5
RimWorld
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required. Shares Strategy with Mars Colony Builder.
A sci-fi colony sim driven by an intelligent AI storyteller. Generates stories by simulating psychology, ecology, gunplay, melee combat, climate, biomes, diplomacy, interpersonal relationships, art, medicine, trade, and more.
- 6
Judgment: Apocalypse Survival Simulation
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required. Shares Strategy with Mars Colony Builder.
Build, scavenge, craft, and perform occult rituals to survive in a demon-infested, post-apocalyptic colony simulation. Will you survive Judgment day?
- 7
Surviving Mars
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required. Shares Strategy with Mars Colony Builder.
There will be challenges to overcome. Execute your strategy and improve your colony’s chances of survival while unlocking the mysteries of this alien world. Are you ready? Mars is waiting for you.
- 8
Oxygen Not Included
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required.
Oxygen Not Included is a space-colony simulation game. Deep inside an alien space rock your industrious crew will need to master science, overcome strange new lifeforms, and harness incredible space tech to survive, and possibly, thrive.
- 9
Gunsmith Simulator
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required.
Become a Gunsmith and unveil the great pleasure of working in your own workshop! Repair, restore and personalize guns to make unique pieces that every firearm lover will appreciate.
- 10
Samurai: Ronin's Path
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required.
Samurai: Ronin's Path is a dynamic action game set in feudal Japan. Fight in true samurai style, unlock new abilities, avoid death, and cut down your enemies using an extensive arsenal available to Asian warriors.
- 11
Gunsmith Simulator: Prologue
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required.
Enter the world of gunsmithing and become a real expert in making, repairing and modifying weapons in Gunsmith Simulator: Prologue. Open your workshop, be creative and excel at gunsmithing!
- 12
Euphorbia Milii
Single-player alternative to Mars Colony Builder — playable solo, no multiplayer required.
A ruined research station reclaimed by nature. Days pass, resources disappear, and decisions leave lasting marks. Euphorbia Milii is a narrative, text-based roguelike RPG where existence costs more than survival. This is vegetation…