Play it: https://granulab-workflo17.vercel.app
A falling-sand powder game in the Dan-Ball lineage: paint elements into a 1280×720 world and watch them interact. 63 element ids, and 21 of those are blank slots for elements you invent yourself in the in-game maker.
What's simulated:
- A half-resolution temperature field covers the world. Fire, magma, torches and sparks pump heat in; ice and snow pull it out. Every phase change is registry data, not special-case code: ice melts, water boils, steam condenses into clouds that rain, sand turns to glass at magma contact, and a hot enough wall will detonate the nitro on the other side of it.
- Contact chemistry (salt + water, acid, virus, clone) comes from a data-driven reaction table.
- A quarter-resolution wind field carries fan beams, saltating sand, and explosion shockwaves.
- Rigid objects: balls bounce, boxes stack, wheels read the slope under each rim and roll downhill, bubbles float up. Powders pile on top of all of them.
- A playable stickman (arrow keys). His head absorbs the last element it touched: a fire head burns things, a superball head jumps higher, a bird head floats. A fighter AI will chase you around the sandbox.
- Custom elements are full citizens: the maker dialog sets state, density, flammability, thermal profile, and up to six reaction rows, and they persist in localStorage.
- A whole scene compresses to a share code of roughly 280 characters you can paste in chat. There are no accounts and no backend.
npm install
npm run dev
npm run build compiles the AssemblyScript core and bundles with Vite.
TypeScript + Vite, WebGL rendering, and a sim core written twice: once in
TypeScript and once in AssemblyScript compiled to WASM. The WASM engine is the
default; npm run parity proves the two engines produce bit-identical worlds, and
?engine=ts switches back if you want to compare. Background modes include a
thermography view, so you can watch the heat field itself.
If something behaves in a way that surprises you, or the UI loses you somewhere, an issue is welcome. "I expected X and got Y" is plenty.