The creator of Dragon Quest, Yuji Horii, at age 72, used Claude’s Artifact feature to create a playable investigation mystery game in about 30 minutes and shared it on X. From AI remakes in 2023 to his G-CON talk in 2025, and now this hands-on implementation, he has consistently remained grounded in the user’s perspective. This incident highlights a harsh reality: as the barriers to programming and art diminish, what is truly scarce is game design itself.
(Prior context: A netizen went viral with "Fallout: New York" created using Claude, then allegedly received a copyright infringement notice and took it down)
(Background: Google's new experimental product "Playground": Generate customized game worlds with a single prompt, in collaboration with the Unity game engine)
Hori Yuji, aged 72, publicly released a detective game he created using AI on X on October 11, 2026, completing it in just about 30 minutes. As of the morning of October 13, the post had garnered 2.72 million views.
He is the creator of the Dragon Quest series, which has surpassed 100 million shipments and downloads combined. In 1983, he single-handedly wrote the story, created the artwork, and programmed "The Portopia Serial Murder Case." 43 years later, he chose to walk the path of "making a game alone" once again, using Claude.
He said: Just give AI a command
Horiyama wrote in the X post that back when he made "Port Town," he came up with the story himself, drew the graphics himself, and coded everything himself. Now, with AI, even if you can't draw or code, you can simply give instructions to AI and create a remarkably polished game all by yourself—he finds it astonishing. The post ends with a playful Easter egg warning: Don't click the "speed up" button in the game.
In the past, when I created "Portopia Serial Murder Case" on a PC, I came up with the story myself, drew the illustrations, wrote the code, and made the entire game alone. Now, with AI, I can create a decent game by myself—even without drawing skills or programming knowledge—just by giving instructions to the AI. I'm truly amazed...
— Yuji Horii (@YujiHorii) October 11, 2026
KuCoin
The game link he provided is a Claude Artifact sharing page, which can be played directly in a browser. According to Japanese media such as Famitsu, the game is titled "Komi of the Interrogation Room," and centers on a theft case involving a pawnshop safe: after midnight that day, the back door of the pawnshop "Sanzendo" was broken into, and a scroll painting titled "Landscape" was stolen. The 72-year-old retired locksmith, Komi, has been named as a suspect.
The player takes on the role of a police officer and must extract a confession from the suspect within two hours before their lawyer arrives. This is done by interrogating to obtain statements, then confronting inconsistencies between the statements and evidence to systematically dismantle each lie. The game has two parameters: the higher the "Shake" level, the more likely the suspect is to confess; if "Resistance" reaches 100, the suspect will refuse to speak. Four lies must be exposed to trigger the final questioning, and the number of lies exposed affects the通关 evaluation. This command-driven, confrontation-based gameplay is hard not to associate with the 1983 text-based detective adventure.
Another coincidence is that the suspect, Komiya, and Horii are both 72 years old.
What is Claude Artifact?
Artifact is a feature of Claude: users describe their needs in natural language, and Claude directly generates executable web applications, creating a one-click shareable link—anyone can play by simply opening a browser, without installation or a development environment. This is one of the lowest-barrier entry points to vibe coding (using spoken commands to direct AI to write code) in 2026. What Horii did is hand this entry point from engineers to someone with 43 years of game design expertise.
European and American responses have been lukewarm; what are the controversies?
Japanese media largely viewed it positively, seeing it as a return to the roots of solo development; Western舆论 was less forgiving. Kotaku’s headline stated that Horiyoshi found AI amazing because he no longer needs to code or draw, and the report also mentioned his recent praise that AI “hardly spouts nonsense anymore.” GamesRadar’s headline directly used the term “AI slop,” and the related post on Reddit’s r/videogames received only a 21% upvote rate, with players commenting that their respect for this great creator had diminished slightly.
The debate in Japan is more specific. Supporters argue that individual development possibilities have been unlocked and prototype validation speeds have greatly increased; opponents express concerns about copyright issues with generative AI and emphasize that a 30-minute prototype is fundamentally different from a commercial product, which also requires debugging, QA, and rights management. These concerns are valid—there is indeed a long way from a functional prototype to a market-ready product.
Three-year journey: He wasn’t pushed along.
Looking back, this was not a spur-of-the-moment decision. On April 24, 2023, SQUARE ENIX released 《AI Tech Preview: The Portopia Serial Murder Case》 for free on Steam, reimagining Portopia using natural language processing to address the frustration players experienced back then—knowing what to do but being unable to guess the correct command strings—though Steam reviews were largely negative.
On November 14, 2025, at the G-CON talk during G-STAR in Busan, South Korea, he said he was impressed by tools like ChatGPT and wanted to create a mystery game where players could discuss with AI subordinates while questioning AI to identify the culprit; the 4Gamer record of the talk also noted that he reflected on how, back then, he learned only four BASIC commands and immediately started building, encouraging young developers to first build something and put it out into the world—even failure is learning. Eleven months later, this idea took shape as an interrogation game, built entirely by himself.
Scarcity lies in the design, not the code.
A 72-year-old creator who adopted and publicly implemented new tools earlier than many younger individuals, while embracing feedback. Second, the shift in scarcity: when code and art can be generated through prompts, design skills such as “how to guide players step-by-step toward the truth within two hours” become the most irreplaceable asset. Komiyama’s two parameters and four lies rely on mastery of interrogation psychology, not syntax.
Of course, 30 minutes doesn't equate to a product, and issues of copyright and quality haven't disappeared. But if the barrier to creation truly drops to zero, what matters next won't be who can code, but who has ideas worth bringing to life.
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