simonwillison.netarticleTree Appreciator
Simon Willison describes another game experiment, this time in the Claude iPhone app in chat mode rather than Claude Code. He prompted Claude Opus 5.5 Max to build a three.js game called "Tree appreciator" with two algorithmically generated trees and a mechanic based on appreciating their differences, and added "think hard about how to make sure it is both fun and beautiful". After about 3 hours 7 minutes of work it returned a spot-the-difference game with music, animation and achievements. He notes that simply telling Opus 5.5 to "make sure it is fun" works surprisingly well.
TL;DR Willison's one-prompt experiment: Claude Opus 5.5 Max spent 3 hours building a polished three.js spot-the-difference game called Tree Appreciator.
Organisations named here
- Anthropic
- Simon Willison
Technologies named here
- Claude Opus 5.5
- three.js
- Claude iPhone app
- Claude Haiku 5.5
- Claude
Techniques named here
- Telling the model to make the output fun
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