Simon Willison reported on a new game experiment built using the default Claude iPhone app in chat mode. The developer prompted Claude Opus 5.5 Max to construct a Three.js game named Tree Appreciator, designed to display two algorithmically generated trees and center its mechanics on appreciating the differences between them. According to the report, telling the model to ensure the game is fun yielded surprisingly effective results during the generation process.
Development Using Chat Mode
The experiment highlights the capabilities of utilizing standard chat interfaces on mobile devices for rapid prototyping and software generation. Instead of specialized coding environments, the developer relied on the default mobile chat mode to instruct the AI model to handle both the technical implementation via Three.js and the conceptual design elements of the game mechanics.
Unresolved Details
The available information does not specify the exact code output length, execution performance across different mobile devices, or whether the generated Three.js code requires manual debugging after creation. The announcement also did not detail the full prompt parameters used beyond the initial instruction, leaving the exact mechanisms behind the algorithmic tree generation largely unknown.
Further observation of mobile AI-assisted development will show how standard chat interfaces continue to influence rapid prototyping workflows.
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