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Salvatore Zappalà’s Weblog · Aug 11, 2026

My “Rally Adventure” one-shot game, made with Opus 5 medium thinking

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salvozappa.com

· 2 minutes read

Rally Adventure

TL;DR: I gave Claude Opus a single prompt asking for an off-road driving game with a retro Screamer Rally look, and let it fan out sub-agents. A few hours later I had Rally Adventure: Three.js, TypeScript and Rapier, every texture and every sound generated in code.

After seeing the tweet by Jake Verbaten on his fire truck game I’ve decided to give it a try.

This is the prompt, strongly inspired by his:

I want you to build a car driving game. Make the graphics as beautiful as you
can, but I want a retro feeling. Think along the lines of screamer rally (find
screenshots). It's ok to have a retro look but it needs to have textures. Focus
on the physics and the car model for now. We can think about level design later.
Make a basic level that has enough slopes to test the physics.
Fan out sub-agents and have sub-agents tackle each one individually so that the
game is utterly perfect. Avoid workflows and favor teammates and subagents.
Don't stop until you are absolutely woowed with the quality when compared to a
real quality game. To check the quality, find and build a corpus of reference
images from the internet. It should literally compare them side by side blind
and say which one looks better.
Do this in ThreeJS & TypeScript.
Always focus on broad perfection acrolss all details of the game, never pidgeon
hole, always focus on the big picture, when in doubt zoom out. work on the
biggest highest impact features for graphics, gameplay, fun factor and total
cohesion.
This is an off road adventure game, you drive an off road jeep. The setting is
in the wild outdoors.

It took a few hours and honestly the result is much better than I expected.

One thing that I found particularly interesting is that Claude developed its own tools to work on audio, rendering, among other things.

The tools Claude built to develop the game The tools Claude built to develop the game

Try it

Link to the game: https://salvozappa.github.io/rally-adventure/

Source code on GitHub: salvozappa/rally-adventure

It’s not original to say that this opens a world of possibilities. And also that it will make evident that game design is not an easy skill to acquire, and that’s the hard part now.

Read the original on salvozappa.com

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