Planned Release Date: Q4 2026

About This Game

Every coin you earn, you can see happen.

No abstract ticking number. A marble rolls, hits a peg, chimes — and a coin pops out. That's the whole game, and it's the whole difference. Buy an upgrade and the mill physically rebuilds itself: a new marble rolls in, a new ring bolts on, a bumper lights up. The numbers are a by-product of the machine.

THIS GAME ENDS. ON PURPOSE.

• ~3 hours to the finale — a real ending, with credits.

• 100% of the achievements are reachable in that time. No grind wall, no season pass.

• No dark patterns. No microtransactions. No "wait 4 hours or pay". No ads. Ever.

Then, if you want to stay: an endless sandbox with everything unlocked.

The mill is an instrument

Every hit is pitch-quantized to a pentatonic scale, so a thousand random collisions come out as a chime melody instead of noise. Each era raises the root a fifth — copper C, silver G, gold D, diamond A — so you can hear your progress with your eyes closed. Copper is a muted wooden tock; diamond is glass.

At full tilt the mill fires around 1,900 collisions a second. It doesn't get louder — it gets denser.

Build it out, melt it down

• Rings bolt on one by one — the machine grows outward like a mandala, up to six rings.

• Five bumper types: peg, bell, mint (coin geyser), amplifier, prism.

• Melt the mill down to keep permanent ingots, then rebuild faster in a new material — copper, silver, gold, diamond.

• Every melt deals you three perk cards and you keep one for the run. A reroll costs an ingot.

• A rare golden marble rolls through. Click it in time for a bonus. Miss it and you lose nothing.

ASMR mode

One key hides the whole interface. No numbers, no shop, no events — just the machine and the chimes.

Good to know

• There is no offline income. The mill runs while you're watching it — this is a game you sit with, not a tab you check.

• It's short by design: ~3 hours to 100%, and then a sandbox to play in.

• Runs on integrated graphics. It's meant for a laptop on a quiet evening.

More from StoneForge Labs

This mill builds itself. In Ballfall you build your own — marble by marble.Wishlist Ballfall

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

Marble Mill's text was written with generative AI assistance — the in-game strings, the achievement and perk descriptions, and this store page.

Nothing else is AI-generated. The mill is drawn by the game's own renderer rather than from image files: the build contains no art assets beyond the window icon, which a script in the project generates. Every chime is synthesised in code as it plays, so the game ships no audio files at all. And nothing is generated while you play — there is no AI model in the game and no calls out to one.