Main Sequence Demo is free on Steam

Our record

We first recorded this on 17 October 2026. Listed on Steam. Picked up from Steam, then checked against the store.

From the store page

Freely explore and build in your starting star system in this singleplayer demo of Main Sequence. Progress through unlocking the first two tiers of technology, culminating in the Slipstream Drive that will enable you to travel and explore the full extent of the star system. Upgrade your ship, battle enemies, and work to build the start of your automation empire. This is what will be waiting in the full game...

Excerpt from the Steam store page. Full description there.

Genres and features

IndieSimulationStrategySingle-player

Questions

Is it really free?

Yes. Main Sequence Demo is free right now on Steam, with nothing to pay.

Is this the full game?

No. A demo is a portion of Main Sequence Demo — usually the opening section — published so you can try it. It is free permanently, but it is not the complete game.

Where do I claim it?

On the official Steam page. We link straight there — we never host game files or act as a middleman.

Earlier giveaways of Main Sequence Demo
Ended	Store	Ran for
—	Steam	—

Earlier giveaways of Main Sequence Demo

Ended

Store

Ran for

—

Steam

—