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Yuji Horii Creates Browser Mystery Game With Claude AI in 30 Minutes

Dragon Quest Creator Yuji Horii Made an AI Game in 30 Minutes

Dragon ball manga pages with characters watching television

Photo by CC PD on Unsplash

What changed

Yuji Horii released Interrogation Room Komiya, a free browser-based mystery game, on October 11, 2026. He said he made it with Claude AI in about 30 minutes by giving instructions rather than writing code or creating assets by hand. Players interrogate a 72-year-old former locksmith suspected of robbing a pawnshop safe.

Why it matters

The striking part is not that AI can produce a small text adventure. It is that Horii is the person demonstrating it. In 1983, he made The Portopia Serial Murder Case alone, handling its story, art and programming. Now he says a single creator can direct an AI and produce a playable game in roughly half an hour.

That makes Komiya a useful before-and-after snapshot of solo game making. The old bottleneck was having to master every craft yourself. The new bottleneck may be deciding what to ask for, then judging whether the result is actually worth playing.

The comparison has limits. The account does not establish how much human editing or testing the game received, or whether Claude produced every part without manual intervention. Still, Horii’s experiment points to a real shift in the shape of a prototype: a game can begin as a conversation, not a blank project folder.

Horii remains involved with Dragon Quest XII, while Next: The Portopia Serial Murder Case is planned for 2027. That pairing gives the experiment extra resonance: the creator is revisiting his earliest mystery work while using a tool that changes what “making it alone” can mean.

Sources (1)
  1. gamingpromax.comDragon Quest Creator Yuji Horii Made an AI Game in 30 Minutes

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