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Image: reddit.com · Sonnet 5.5 and threejs is amazing at updating old dos games!

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An old DOS game, Cyberbox, rebuilt for the browser

Claude was given the exe of an old DOS game and rebuilt it for modern browsers with five themes, 1:1 levels and a shareable level editor.

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Credits

  • Reddit poster basedradio Source ↗

Earliest dated source: 29 Sept 2026

The full story

The poster likes giving Claude the exe of an old DOS game and having it modernise it. Their example is Cyberbox, which they used to play.

The result runs in a browser on desktop and mobile, has five themes each with its own style and sound, ports each level over 1:1, and adds a shareable level editor.

How it was done

Tools

Themes

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Sources

From a short post by the maker, so the details are as they tell them.

  • Reddit: Sonnet 5.5 and threejs is amazing at updating old dos games!Forum threadreddit.com
    Reddit poster: basedradioPosted 29 Sept 2026

    The maker's post on r/ClaudeCode.

    If it disappears: archived copy of Reddit: Sonnet 5.5 and threejs is amazing at updating old dos games! (opens in a new tab)

  • The project: web-ten-sage-26.vercel.appBlog or write-upweb-ten-sage-26.vercel.app

    Linked in the post.

Related builds

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Prompt & Solder

An independent community project. Not affiliated with Anthropic.

What this is. Real projects where people used Claude to build, fix, port, revive or take apart something, from jailbroken Kindles to rebuilt DOS games, plus the times it went badly wrong. Every build links to where it was shared, and every source is listed here.

How far to trust it. We summarise what people reported and say what each build rests on: a full write-up with code, a short post, or a passing comment. We haven't tested them ourselves. Photos are shown from the original sources with credit. Only modify hardware you own, and back up first.

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