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A game built on an old phone without knowing what it would be

"Vibe discovery": a game that took shape on an old phone with no requirements set up front.

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Credits

  • HN submitter kikkupico Source ↗

Earliest dated source: 15 Jan 2026

The full story

The whole spec was one line: "Create a web-based game that leverages the accelerometer creatively." The author typed it into Claude Code running on a four-year-old Redmi Note 9 phone with 4 GB of RAM. Over six iterations they discovered what they wanted, and three hours later had Inertia, a WebGL marble game with procedural terrain. They call it "vibe discovery": unlike vibe coding, you don't know the requirements up front.

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Sources

From the maker's own write-up or code. We summarise what they report; we haven't tested it ourselves.

  • Hacker News: Show HN: I built a game on my old phone without knowing what I was buildingBlog or write-upkikkupico.com

    The write-up of the process and the phone dev set-up.

  • Hacker News discussion (11 points)Forum threadnews.ycombinator.com
    HN submitter: kikkupicoPosted 15 Jan 2026

    The Show HN post.

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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.

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