---
name: opus-5-5-game-the-volcano-test-voxel-sandbox
description: "Use when you want a game like az9713's \"The Volcano Test: voxel sandbox\". Runs their exact Claude Opus 5.5 prompt."
source: https://github.com/az9713/opus-5.5-builds
prompt_source: https://az9713.github.io/opus-5.5-builds/opus55-15-variations-specs.html
author: "az9713"
model: claude-opus-5-5
---

# The Volcano Test: voxel sandbox

A free prompt from the Omo "Opus 5.5 game prompts" collection.

- Made by az9713 and shared on GitHub: https://github.com/az9713/opus-5.5-builds
- Prompt quoted word for word from: https://az9713.github.io/opus-5.5-builds/opus55-15-variations-specs.html
- Play the original: https://az9713.github.io/opus-5.5-builds/builds/06-volcano-test/index.html
- Model as stated by the creator: Claude Opus 5.5. Omo has not re-run it, so your result will differ.

## How to use

1. Open Claude Code (or a Claude chat for a single-file HTML game) running Claude Opus 5.5.
2. Paste the prompt below.
3. Change the theme, characters or rules if you want your own version.
4. Play it, then ask for fixes in plain words.

## Prompt

```text
Make a voxel sandbox game in the browser on a volcanic island.
Let the player walk, mine blocks, and place blocks. Show a hotbar at the bottom center.
Add water and lava that flow block by block.
When lava touches water, turn the lava into obsidian.
Make the volcano erupt on a timer and send lava down its sides.
Use heavy shaders: reflective water, soft shadows, sun rays, bloom, and a glow from the lava.
Add black-sand beaches, palm trees, and ash clouds.
Add a full day-night cycle with sunset, moon, and stars.
```

---
The prompt and the game belong to their creator. Listed on omo.space with credit and a link to the original.
Creator and want it removed? https://omo.space/support