A living frontier · free · in your browser
Make a life on the edge of settled space — miner, farmer, entertainer, healer, builder, beast-tamer, pilot. The frontier doesn't care which. It only asks that you work it.
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Eternal Expanse is a persistent multiplayer world in the spirit of the great sandbox MMOs — the kind where the economy is player-made and a profession is an identity.
You wake as a Unit — a robotic settler — aboard Haven Station, in orbit over the desert world Meridian. Below: canyon country, dune seas, hydroponic farms, a frontier settlement, and wilds full of creatures that don't want to be tamed. Above: wreck fields to salvage in zero-G, and stars that are further than they look.
There is no quest arrow marching you to an ending. There's ore that needs mining, crops that need tending, meals that need cooking, buildings that need raising, cantina crowds that need entertaining, wounds that need healing, and cargo that needs hauling — and other people doing all of it beside you. What you become is up to you.
Everything runs in the browser. No download, no install — an account, a name, and you're on the station.
Systems that feed each other, the way a frontier actually works.
Prospector, farmer, entertainer, healer, artificer, courier, bounty hunter, politician and more — levelled by doing, taught by other players.
Nearly everything worth having is gathered, crafted, cooked or performed by someone. Quality matters. Escrowed contracts keep trade honest.
Claim ground on Meridian — huts, tents, modular homes, whole community settlements with shared projects, storage and hired keepers.
Own a fleet of working droids: gatherers, servers, fabricators. Fit modules, set their orders, and they keep working while you're away.
Tame pack animals, ride them across the dunes, load their saddlebags, milk the goats. Yes, the goats matter.
Buy a hull, walk its interior, fly between the station, the wreck fields and the planet — or hire your pilot droid to run the haul routes.
Factions with real standing, bounties on real players, arrests, judgments, and elected community government with a treasury.
Sandstorms roll the dunes, day turns to dusk, NPCs keep their own schedules — the world doesn't pause because you logged off.
Enough to get from the login screen to your first paid work.
Behind the frontier
No studio, no team, no publisher. If you build with AI too, everything I learned doing it is free below.
I've wanted to make this game since I was a kid. A whole planet you can mine, farm, build on and fly off — with other people living in it.
Most of the AI-made games you've seen are a flat 2D clone or a block-world knockoff. This one is a real 3D multiplayer world — professions you level by doing, an economy players actually run, droids that keep working while you're logged off, and sandstorms that roll in whether or not you're online. It runs in a browser tab. There is nothing to install and nothing to pay.
Building it was the easy week. Making it work for strangers was everything after — and that's the part no model warns you about.
A test suite that stayed green while players sat looking at a black screen. Models so heavy the world could barely load. A one-terabyte drive quietly eaten down to its last gigabyte by the agent's own logs. None of that is a coding problem, and none of it is in any tutorial.
So every time something broke, I wrote down the rule that fixed it. Fourteen of them are Claude Code skills now — they are what actually built this, and they're what the free book is about. If you're making anything with an AI agent, it should save you the weeks it cost me.
Play the game, or take the shortcut I didn’t have. The book walks through every failure and the rule that fixed it, alongside the Claude skill that now does the remembering for me. Free, and the whole book is on the page — no signup to read it.