Pixel-art card game built with Claude Opus from a single prompt: Claude Opus launch video

Originally posted by @aisongman on X · posted Sep 26, 2026 · curated by MotionHunt, updated Oct 16, 2026

In short

The post presents a pixel-art, Hearthstone-style 1-on-1 card game that the author says was built with Opus 5.5 from a single short prompt. The author says the gameplay and UX are almost identical to Hearthstone, with different graphics, and has open-sourced the full source code.

How it was made

The author states the game was built with Opus 5.5 in one go from a single prompt, with no game design doc, detailed mechanics, or UI spec. No controlling tool, rendering method, build time, or cost was shared.

Tools: Claude Opus
Effort: Single prompt with no design doc or UI spec, per the author
Source: Source code

Why it works

The prompt is one short line with no design doc, mechanics, or UI spec, according to the author.
The only visual direction is the pixel art style, which keeps the request open on everything else.

Remix it for your product

Create a [PRODUCT]. Just make it. As best you can. [FEATURES].

Fill in your product, set the direction and add your logo. Copy the brief or download a ZIP for Claude Code.

Customize this prompt

FAQ

What tool made this launch video?

This video was made with Claude Opus.

Can I see the prompt behind this video?

The prompt has not been published. Check the original post on X for details from the creator.

What kind of product is this video for?

It is a launch video for a other product.