Real Agent Cases

Vibe-code a 3D town-building game with Claude Code

Source date:
Last verified:
Method:
How we verify

Evidence: Article or interviewA newsletter, journalist or interview account of what happened.

Outcome

From a single informal prompt, Claude Code built a working 3D game for placing buildings and driving around in about four minutes; follow-up prompts added a fire truck, traffic, and fires.

Reported by One Useful Thing:Working game in about four minutes

This is the source's own number. We haven't measured it.

Agent

Claude Code

Prompt Original prompt

Exact prompt as published in the source.

make a 3D game where I can place buildings of various designs and then drive through the town i create.

Source

https://www.oneusefulthing.org/p/speaking-things-into-existence

By Ethan Mollick · Published Mar 11, 2025 · Added Oct 15, 2026 · Last verified Oct 15, 2026

  • Claude Code (Sonnet 4.5) wrote every line of code and every test for the datasette-os-info plugin with minimal prompting, and the author shipped it.

    Claude Code · Coding · Source date:

  • Migrate two websites from WordPress to Wagtail with Claude CodeRecreated promptEvidence: Described by poster

    Over a weekend Claude Code migrated two sites from WordPress to Wagtail (PHP to Python), including server setup, data transfer, testing and fixes, and redesigned a homepage; the poster reports nothing broke and traffic and tools stayed in place.

    Claude Code · Coding · Source date:

  • Migrate a 50-screen app from Firebase to Supabase with Claude CodeRecreated promptEvidence: Described by poster

    Going feature by feature, the poster used Claude Code to generate database schemas, write queries and fix daily errors; they report migrating about 85% of a 45–50 screen Flutter app from Firebase to Supabase in 10–20 days.

    Poster says:~85% migrated in 10–20 days

    Claude Code · Coding · Source date: