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Image: reddit.com · Video still: Weekend Opus 5.5 Project - Multiplayer Insaniquarium game mod, escalating all the way to a new MOBA game mode

Worked Proof shown

A multiplayer Insaniquarium mod with a MOBA mode

Claude, given a decompiled copy of Insaniquarium, built a co-op mode and four more game modes, including a MOBA, over one weekend.

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Credits

  • Reddit poster SpudMyBud Source ↗

Earliest dated source: 29 Sept 2026

The full story

The poster had wanted to make a multiplayer Insaniquarium mod for months but lacked the time. With Opus 5.5 they gave a single prompt plus a decompiled version of the game as starting help.

About four hours later a co-op mode worked after a single attempt. By Monday morning there were five new game modes, the favourite being a MOBA mode playable against friends or locally against bots. The trailer was also made by Claude.

How it was done

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Sources

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

  • Reddit: Weekend Opus 5.5 Project - Multiplayer Insaniquarium game mod, escalating all the way to a new MOBA Forum threadreddit.com
    Reddit poster: SpudMyBudPosted 29 Sept 2026

    The maker's post on r/ClaudeAI.

    If it disappears: archived copy of Reddit: Weekend Opus 5.5 Project - Multiplayer Insaniquarium game mod, escalating all the way to a new MOBA (opens in a new tab)

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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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