grain.

A tiny laboratory for gravity, flow & erosion.

SIMULATION LIVE
Sandbox100 × 100 cells
Click & drag to pour · 1–4 select 60 FPS

Run & lifetime records

Autosave ready
LIVE PARTICLES0of 10,000 cells
RUN PEAK0Best: 0
PAINTED THIS RUN0Best: 0
ACTIVE RUN TIME00:00Lifetime: 00:00
Sand painted0This run: 0
Water painted0This run: 0
Wall painted0This run: 0
Acid painted0This run: 0

World and records save automatically on this browser. Only newly painted cells count toward painting totals; the starter scene does not. Acid consumes itself and one adjacent grain of sand or wall.