Start where we are
Wind, solar, a materials plant and a research campus on a real globe. Fission and fusion when you have earned them, and a launch pad when Earth can finally afford to look up.
Earth industry, playable
A black hole will cross the Solar System in the year 12,000. Start with today’s factories, grow an economy across space, and build the engine that carries everyone out of its path.
Checking the latest build…. An early build.
Every era of Helios hands the last era’s busywork to automation, so you are always making the next big decision rather than babysitting the old ones.
Wind, solar, a materials plant and a research campus on a real globe. Fission and fusion when you have earned them, and a launch pad when Earth can finally afford to look up.
Earth industry, playable
Ice in the polar craters becomes propellant. Landers fly home fuelled, and cargo to orbit stops depending on every kilogram lifted from Earth.
Orbit, Moon and the asteroid belt, playable
Asteroid metal, a shipyard in orbit and collectors built at Mercury add up, ring by ring, to a swarm around the Sun. Humanity becomes a civilization that runs on a star.
Planned chapter
We cannot change the black hole’s path. A mirror the size of a world can change ours: sunlight pushed one way, the Sun and every planet drifting the other, out of harm’s way.
The ending
Capacity factors, ore grades, delta-v and trip times follow real numbers, compressed so they play well.
Run factories by hand on Earth; later they run themselves while you plan launches, then worlds.


Saturn V, Hubble, Lunokhod and 27 more cross your screen. Catch one for a bonus and its story.
Humanity chose you and your grandchildren. Kyle I hands over to Kyle II, and the years keep counting.
Checking the latest build…
First launch on macOSThis early build is unsigned. Right-click Helios and choose Open the first time; after that it opens normally.
First launch on WindowsIf SmartScreen says it protected your PC, choose More info, then Run anyway.
Helios runs on Mac and Windows. Send yourself this link and open it on your computer.
Prefer itch.io? The itch.io page is coming soon.