Single-player games like Outpost: Infinity Siege
Below are 16 single-player Steam games similar to Outpost: Infinity Siege, 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 Outpost: Infinity Siege page.
Ranked picks
- 1
The Riftbreaker
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Action with Outpost: Infinity Siege.
The Riftbreaker is a solo or Co-op base-building, survival game with Action-RPG elements for up to 4 players. Hack & slash countless hordes of enemies. Build up your base, craft powerful weapons and research new inventions to survive.
- 2
Mindustry
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Strategy with Outpost: Infinity Siege.
An open-ended factory management game with RTS and tower defense elements.
- 3
Taur
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Action and Strategy with Outpost: Infinity Siege.
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?
- 4
Armed to the Gears
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Action and Strategy with Outpost: Infinity Siege.
Control a fully armed Mech and fight through cyberpunk cities, military bases and industrial ruins. Capture and defend territories, build turrets and structures, and wage war against powerful enemies!
- 5
Vectorio
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Action and Strategy with Outpost: Infinity Siege.
Build. Automate. Defend.
- 6
Generation Zero®
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Action with Outpost: Infinity Siege.
Generation Zero is a stealth-action shooter where you wage guerilla warfare against lethal mechanical enemies. Explore a vast open world map inspired by the Swedish Cold War era, take part in the resistance alone or with up to three friends in seamless co-op.
- 7
Per Aspera
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Strategy with Outpost: Infinity Siege.
Make Mars your own! Take control of the world’s most sophisticated AI (AMI) and terraform the surface of the Red Planet for a city-building experience on a planetary scale. Transform this barren world into a lush paradise and explore the surface for any ancient secrets that may be waiting.
- 8
Iron Brigade
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Action and Strategy with Outpost: Infinity Siege.
Join The Mobile Trench Brigade and protect humanity from the evil Monovision menace!
- 9
Orcs Must Die!
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Action and Strategy with Outpost: Infinity Siege.
Slice them, burn them, skewer them, and launch them - no matter how you get it done, orcs must die in this fantasy action-strategy game from Robot Entertainment.
- 10
RimWorld
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Strategy with Outpost: Infinity Siege.
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.
- 11
Diplomacy is Not an Option
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Action and Strategy with Outpost: Infinity Siege.
Diplomacy is Not an Option is a strategy game set in a medieval fantasy world. Build your town and defenses, raise huge armies and fight against massive hordes of enemies. How long can you survive?
- 12
Cataclismo
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Strategy with Outpost: Infinity Siege.
Design and build fortresses brick by brick to stand against endless hordes of Horrors in this real-time strategy game with resource management, siege defense, and exploration. Lead from the ramparts, push back the darkness, and hold fast against the creatures of the Mist.
- 13
From Glory To Goo
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Strategy with Outpost: Infinity Siege.
From Glory To Goo is a Sci-Fi survival RTS set on an alien world. Serve as humanity's bulwark by establishing a colony and supporting your colonists still in orbit. But beware, for The Goo, a relentless and shape-shifting force approaches from all sides, even above and below.
- 14
Stranded: Alien Dawn
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Strategy with Outpost: Infinity Siege.
Brave a new world in Stranded: Alien Dawn, a planet survival sim placing the fate of a small marooned group in your hands. Forge your story through compelling and immersive strategic gameplay as you make vital decisions to protect your survivors.
- 15
Stronghold 2: Steam Edition
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Strategy with Outpost: Infinity Siege.
Tax, torture or treat your peasants! Rehabilitate criminals or sentence them to death? Decide as you enjoy jousting over a lavish banquet, all while under siege from the warmongering Lord Barclay.
- 16
Project Morpheus: Prologue
Single-player alternative to Outpost: Infinity Siege — playable solo, no multiplayer required. Shares Action and Strategy with Outpost: Infinity Siege.
Welcome to Project: Morpheus, you will reprise yourself as EAST, and play your way in this world where reality and dreams collide.