ProductsProduct / feature launchLarge Language Models · Applications1 source · Oct 14, 2026

Tree Appreciator

Build a three js game called "Tree appreciator" - it shows you two algorithmically generated trees and the game mechanics is about appreciating the differences between them.

Proof1 independent outlet

Key points

  • This one used the default Claude iPhone app (chat mode, not Claude Code mode) where I prompted Claude Opus 5.5 Max with:
  • Somewhat embarrassingly given my recent talk, I've found that telling Opus 5.5 "make sure it is fun" works uncomfortably well.
  • In this case Claude crunched for 3 hours and 7 minutes before retuning a cosy little spot-the-difference game with music and animation and achievements that's quite compelling to play.
  • Tags: game-design, javascript, ai, generative-ai, llms, claude, vibe-coding, three-js

Sources (1)

  • [1]Tree Appreciator
    Simon Willison's Weblog · Oct 14, 09:23 PM
    Build a three js game called "Tree appreciator" - it shows you two algorithmically generated trees and the game mechanics is about appreciating the differences between them.
    This one used the default Claude iPhone app (chat mode, not Claude Code mode) where I prompted Claude Opus 5.5 Max with:

Extractive summary: sentences quoted from the sources.

Hype check

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