Single-player games like Complex SKY
Below are 8 single-player Steam games similar to Complex SKY, 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 Complex SKY page.
Ranked picks
- 1
Apocalypse Factory
Single-player alternative to Complex SKY — playable solo, no multiplayer required. Shares Strategy and Simulation with Complex SKY.
Automate production, defend your machines, and build the Escape Ark to save what’s left of humanity.
- 2
Copacetic
Single-player alternative to Complex SKY — playable solo, no multiplayer required. Shares Strategy and Simulation with Complex SKY.
The 3D Pipes screensaver, but a resource management game, inside of a cube, about genocide. Place factories and modules around the walls of your mind, avoiding tangles as you wire them all together. Travel across the galaxy harvesting all sentient life. Space is limited, and the only enemy is you.
- 3
Factory Town 2: Paradise
Single-player alternative to Complex SKY — playable solo, no multiplayer required. Shares Strategy and Simulation with Complex SKY.
A Town Builder + Factory Sim where you fully automate a tropical village and feed a giant volcano. Use conveyor belts, trains, boats, zip lines, pipes, water wheels and more to produce massive amounts of items and keep everyone happy!
- 4
Biofactory
Single-player alternative to Complex SKY — playable solo, no multiplayer required. Shares Strategy and Simulation with Complex SKY.
Build your living factory using organs and fleshy biomachines. Combine your pulsating machines to automate and scale up production. Mine, harvest, produce and assemble weird materials in a grimdark biopunk setting. You are an evolving hive-mind brain, driven by one instinct: The factory must grow.
- 5
RAILGRADE
Single-player alternative to Complex SKY — playable solo, no multiplayer required. Shares Strategy and Simulation with Complex SKY.
RAILGRADE is the train RTS game! Construct dense vertical railroads, build cities, construct vast factory chains with train automation! Restore an off world colony's economy all in the intense story driven campaign or relaxing sandbox mode!
- 6
Modulus: Factory Automation
Single-player alternative to Complex SKY — playable solo, no multiplayer required. Shares Simulation with Complex SKY.
Build, automate, & optimize production lines across sky islands with real spatial constraints. Every production line is an open-ended puzzle: which operators to use, how to route your belts and how to fit your factory into the landscape. Your solutions, like your factories, are uniquely your own.
- 7
Hammerting
Single-player alternative to Complex SKY — playable solo, no multiplayer required. Shares Strategy and Simulation with Complex SKY.
Manage a Dwarven mining colony in the unexplored mountains of Mara. As conflict rages in the Overworld, you will need to craft, explore and fight as you provide the allies of your choice with the finest weapons and gear to assist them in the battle for glory.
- 8
InfraSpace
Single-player alternative to Complex SKY — playable solo, no multiplayer required. Shares Strategy and Simulation with Complex SKY.
Create an extrasolar efficiency utopia from scratch! In this sci-fi city builder you need to start mining operations, plan production, and lay down transportation routes to ensure a smooth supply chain.