Falling-sand physics playground

A browser-based falling-sand physics sandbox

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Description

A web-based particle physics simulation where different elements interact according to realistic rules, such as fire burning oil or plants growing in water. The sandbox maintains high performance even with tens of thousands of active particles calculated in real-time.

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Details

Why this is interesting: Detailed particle physics and element interactions handled within a single self-contained file.
Built with: Opus 5 Opus 4.8 Opus 4.7 Opus 4.6
Tags: #i-blind-tested-the-new-claude-opus-5 #experiment

Discovered: YouTube
First posted: YouTube · Jul 25, 2026
Listed: Added 8h ago

Prompt

Build a falling-sand physics playground as a single self-contained HTML file. Elements: sand, water, fire, oil, ice, steam, plant. They must interact realistically: fire burns oil and plants, water extinguishes fire, ice freezes water, steam rises and condenses back into water, plants grow when touching water, oil floats on water. Give me brush tools to paint each element, an adjustable brush size, and a clear button. It must stay smooth with tens of thousands of active particles. No external libraries, no network requests.

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