The Volcano Test: voxel sandbox

A sandbox game az9713 built with Claude Opus 5.5. Copy the exact prompt free.

The Volcano Test: voxel sandbox cover
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by az9713FreeOpus 5.5 game prompts

az9713 built this with Claude Opus 5.5 and shared the full prompt on GitHub; it is quoted below word for word. One of 15 builds made with Claude Opus 5.5 in Claude Code, each a variation on a viral original. The repository publishes every prompt and the check each build had to pass. A variation on "The Minecraft Test" by @noahwachnik.

The prompt

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.

Prompt by az9713, quoted word for word from their GitHub repository. Model as stated by the creator; your result will differ.

What’s inside

  1. Copy the prompt below, or download it as a SKILL.md
  2. Paste it into Claude Opus 5.5, ideally in Claude Code so it can write, run and test the game
  3. Swap in your own theme, characters or rules where the prompt names theirs
  4. Play it, then ask for fixes and polish in plain words

What you’ll bring

  • Claude Opus 5.5 (Claude Code, or a Claude chat for single-file HTML games)
  • A browser to play the result
  • Your own twist on the idea, if you want one

What you’ll get

  • A playable browser game in the spirit of the one above, written by Claude
  • The code, which you can keep editing

Perfect for

  • Anyone who wants to make a game without coding
  • Developers testing what Opus 5.5 can build
  • Teachers and parents making a game with kids

Also found as

opus 5.5 game prompt · claude game prompt · one shot game prompt · sandbox · the volcano test: voxel sandbox

Questions

What is The Volcano Test: voxel sandbox?

The Volcano Test: voxel sandbox is a sandbox game that az9713 built with Claude Opus 5.5. This page quotes the prompt they shared, word for word.

Who made it, and where was the prompt shared?

az9713 made it and shared the prompt on GitHub: https://az9713.github.io/opus-5.5-builds/opus55-15-variations-specs.html. You can find more from them at https://github.com/az9713/opus-5.5-builds.

How do I use the prompt?

1. Copy the prompt below, or download it as a SKILL.md. 2. Paste it into Claude Opus 5.5, ideally in Claude Code so it can write, run and test the game. 3. Swap in your own theme, characters or rules where the prompt names theirs. 4. Play it, then ask for fixes and polish in plain words.

Is it free?

Yes. Copying the prompt and downloading the SKILL.md costs nothing on Omo. You run it with your own access to Claude Opus 5.5.

The video and the prompt belong to az9713. Omo lists them free, with credit and a link to the original post. Creators can ask us to remove a listing at omo.space/support.