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A factory automation game where you are the mind of a self-replicating interstellar probe. Turn barren rock and ocean into sprawling industry that feeds the data centers you run on. Launch copies of yourself until they fill the sky. No enemies. Build at your own pace.

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About Fill the Sky

Land. Build. Launch.

A probe settles onto an empty island beside an ocean, carrying little besides the knowledge of how to build.

Fill the Sky video 1

Begin with scraps, build a massive factory.

You are the mind of a self-replicating interstellar probe. Start small: mine,

smelt, assemble. Then learn to build the ships that will carry copies of yourself to the stars.

Technology shapes your factory

Belts, ships, pipes.  Then mass drivers to relieve spaghetti (if you choose).

Engineer in peace

No enemies, and no clock.

Night falls, the stars come out and smoke drifts across the landscape. Photo

mode captures it all.

Find the bottlenecks

Hold a key and the factory shows you the slow areas: full belts, starved

machines. Trace and fix the issues. Upgrade.  Save optimized blueprints and use them to expand quickly.

Watch it over and over.

Open Rewind and watch a time lapse of your factory from the first miner to the last launch.

Speed up, pause, use the camera to roam freely.  Jump to any moment and restart from that point.

The first launch is only the beginning.

Features

Build across an island chain in the open ocean: belts, harbors, ships, pipes, mass drivers
Solar, wind, batteries, coal, oil and nuclear power. Balance demand with supply
Deep and endless tech tree.
Utilization overlays on one key, undo everywhere, a blueprint library
Rewind: replay your whole play through as a montage, scrub to any moment, take control from there
Real-time 3D world with a free floating camera
Single-player

Peaceful engineering. Fill the sky.

Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.

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