Helios
The orbital station in Helios: a ring of depots, habitats and a shipyard above Earth

Ten thousand years to move the Sun.

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.

The plan, as humanity wrote it

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 turbines, solar fields and a fusion campus on the North American coast

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 lunar base: solar arrays, ice mining and an electrolysis plant linked by roads

The Moon pays its own way

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

A swarm of solar collectors circling the Sun

Catch the Sun’s light

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

A vast mirror beside the Sun bends its light into thrust, with the black hole's path drawn past it

Move the Sun

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

A production game that keeps getting bigger

Grounded in real science

Capacity factors, ore grades, delta-v and trip times follow real numbers, compressed so they play well.

Each era automates the last

Run factories by hand on Earth; later they run themselves while you plan launches, then worlds.

Historic spacecraft drop by

Saturn V, Hubble, Lunokhod and 27 more cross your screen. Catch one for a bonus and its story.

A lineage, not one lifetime

Humanity chose you and your grandchildren. Kyle I hands over to Kyle II, and the years keep counting.

Begin on Earth

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.

Prefer itch.io? The itch.io page is coming soon.