October 9, 2026 COTB Physics

The Dance

Cultures of the Belt was always meant to be Minecraft in space, with the kind of pain-in-the-ass physics that physics actually has. For a long time it wasn’t. The tethers were drawn, not felt. Ore vanished into robots. Robots changed direction for free. It looked like mining. It wasn’t.

This month we tore that out and put physics back in.

A sunlit voxel asteroid carved hollow, a yellow hauler in the foreground and another overhead, a miner on its tether working the cut, Jupiter on the horizon.
A rock the fleet has been working. The hollow is real: every block in it was cut, popped and caught.

Delta-v is the money

Everything in the belt costs delta-v, the change in velocity your propellant can buy you. Robots carry real propellant mass at real exhaust velocities, so the rocket equation isn’t a formula we wrote down. It’s what happens when a hauler full of ore tries to stop. Every robot shows a delta-v bar. When it gets low, the robot says so with the numbers: what it has, what it needs to get home.

Miners don’t carry much. They can’t carry propellant, a mining laser, all that equipment and get home. So they ride haulers like a carrier, and the hauler carries the budget.

Tethers that pull

Cables are real now. A miner fires a harpoon from its carrier. The dart flies under the rock’s weak gravity and bites a real block on the surface. Then the miner reels itself in. A taut line pulls both ends. A slack one pulls nothing. Snatch it too hard and it snaps, and you see why.

Blocks that pop

Cut a block out of a rock and it pops off the surface with the rock’s own spin, arcs under the rock’s gravity, and either falls back like slow popcorn or escapes for good. The miner’s magnet catches what it can, and the miner feels the tug. Nothing silently disappears: ore lost to space is counted, and it’s still out there.

The dance

This is our favourite thing in the game. A miner hanging off a spinning rock on its line has momentum for free. So instead of flying home, it waits for the right moment in the rock’s spin, lets go, and coasts. Its carrier backs off for a run-up and meets it at a point they agreed on. The miner trims its course with little puffs of its jets. It’s always cheaper to catch than to miss, so it will burn every last gram to make the catch.

Eight frames: a planned ghost path and meeting ring, a miner on a line from a rotating asteroid, the release, the coast, and a catch ring flashing on the carrier.
The dance, eight frames from the real simulation: plan, on the line, release, coast, catch.

When it misses, it misses for a reason you can see. It misjudged the spin. Its carrier was busy. It ran out of propellant aiming. Those are the moments we built the game for.

ARIA is watching

ARIA, your colony’s AI, narrates from the actual numbers. She’s not allowed to invent facts, and a fact checker rejects her lines when she tries. Inside that rule, she’s whoever she turns out to be. Mostly, she’s bored. Sometimes she isn’t.

A carved asteroid with RUNAWAY alerts on the right and ARIA's purple speech card at bottom left.
After two robots were lost: “I’m starting to think the rocks are lonely and this is how they get even.”

Mail from the inner system arrives in bursts, light-minutes late. ARIA reads it first and tells you which offers are worth your time and which letters can wait.

What will the culture of the Belt be?

That’s the question the game is asking. Your robots run on algorithms, and the fleet’s culture is described from what actually happened: how often they chose their own work, how far from home they roam, how many they’ve lost. Nothing in it is a score. Nothing pays out. We don’t want you optimising a culture. We want to watch one emerge.

A panel titled Fleet Culture listing dimensions such as autonomy, isolation and grief, each with a one-line explanation citing counts of real events.
The Culture panel. Every line says because, and cites what happened.

The real solar system

The planets are real size now, wearing real NASA and USGS maps from Cassini, Viking, Dawn and Galileo. From the belt, Jupiter is a dot. Zoom out and the view eases into a map of the whole system.

Earth at true scale with the Blue Marble map, Africa and Europe in view.
Earth, from the game's photo mode (F10 hides the HUD and every marker).
Saturn with its concentric rings, lit from the side.
Saturn, at true scale, with the Cassini bands.

What’s not done

Physics in the mining sites is honest. Between the rocks it isn’t yet. Out there, things coast in straight lines instead of falling around the Sun, and that has made robots wander off in ways that are funny exactly once. The next big piece is one gravity for everything: robots that fly orbits, where burning toward a rock leaves you behind it. We’re also still teaching the colony to mine ice before it runs out of propellant. Ice is propellant, and a fleet without it doesn’t come home.

Physics is real and unforgiving. The spectacle is faked as convincingly as we can.

Play it now at play.multiversestudios.xyz/cultures-of-the-belt/. Pay what you can.