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The man who made The Portopia Serial Murder Case has built an interrogation game with AI. And he says it took him “only about 30 minutes.”
Here’s the bottom line. Yuji Horii, known for Dragon Quest and The Portopia Serial Murder Case, posted on his own X account about making a game with the help of AI. It’s called Komiya in the Interrogation Room, a mystery adventure you can play for free in your browser.
You play as the police officer assigned to a pawnshop safe break-in. The suspect is “Komiya,” a 72-year-old former locksmith. Your job is to interrogate him and dismantle his lies.
A guy who built an adventure game by himself more than 40 years ago is now doing the same thing with AI in half an hour. Let’s unpack that, and what it actually means.
What is Komiya in the Interrogation Room? A browser mystery adventure Yuji Horii made with AI
Komiya in the Interrogation Room is a mystery adventure game Yuji Horii created with the help of AI, and it’s playable for free in a browser.
You take the role of a police officer questioning the suspect in a “pawnshop safe break-in” case, sitting across from “Komiya,” a 72-year-old former locksmith. Komiya lies sometimes, and your job is to find where his statements contradict each other and hit those spots with evidence until they collapse. That’s the core loop.
Anyone who’s played The Portopia Serial Murder Case will recognize the shape of this immediately. Press him, find the contradiction, get him talking. The template Horii brought to Japanese adventure games over 40 years ago, condensed into miniature.
How does Komiya in the Interrogation Room work? Two stats: Agitation and Resistance
Komiya in the Interrogation Room runs on two parameters, “Agitation” and “Resistance,” and if Resistance hits 100, Komiya clams up and refuses to talk.
Which means leaning on him as hard as possible isn’t the winning strategy. Hitting him with evidence raises Agitation, but push the wrong way and Resistance climbs too. The moment Resistance maxes out, you can’t get another statement out of him, so you’re constantly judging how far to go.
Your end-of-game rating depends on how many of his lies you exposed. So you’re not scored on whether you cleared it, but on how much of his story you broke down. Thirty minutes of work or not, the logic behind that balance is pure game designer.
| Item | Details |
|---|---|
| Title | Komiya in the Interrogation Room |
| Created by | Yuji Horii (using AI) |
| Genre and price | Mystery adventure. Free in your browser |
| Your role | A police officer investigating a pawnshop safe break-in |
| The suspect | “Komiya,” a 72-year-old former locksmith. Lies sometimes |
| Parameters | “Agitation” and “Resistance.” At 100 Resistance, he goes silent |
| Scoring | Your ending rating changes based on how many lies you exposed |
| Development time | “Only about 30 minutes,” per Horii himself |
Why did Yuji Horii share his AI-made game? The Portopia contrast is the point
What Horii emphasizes in his X post is the gap between what making games was like back in the Portopia days and what it’s like now.
By his account, on Portopia he handled the story, the art and the programming all by himself. Now he just gives instructions to an AI and one person can put together a halfway decent game. “Honestly, I’m amazed,” he wrote.
That contrast is the whole story. The guy who did everything alone in 1983 is now doing it alone in 30 minutes. This is about what happens when someone who can already make games gets AI — not about anyone being able to build a mystery adventure in half an hour. Knowing where to apply pressure to make it interesting, knowing what should drive Resistance up: that judgment doesn’t arrive in 30 minutes.
…Still, hearing “30 minutes” makes me want to go build something. Genuinely.
Where can you play it? Where it’s hosted and what to know first
Komiya in the Interrogation Room can be played directly in a browser via the link Horii shared in his X post. There’s nothing to buy and nothing to install.
One caveat worth noting. Since this is a solo project put together in a short window, there’s been no official word on how long it will stay up or whether the URL will be maintained. If you want to try it, better to do it sooner rather than later. There’s also been no announcement about saves, leaderboards or anything else that implies long-term support.
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Komiya in the Interrogation Room: everything announced
To recap the confirmed details: Yuji Horii posted on his own X account about making a game with AI, releasing the mystery adventure Komiya in the Interrogation Room free in the browser. You play a police officer interrogating “Komiya,” a 72-year-old former locksmith who is the suspect in a “pawnshop safe break-in” case.
The system runs on two parameters, “Agitation” and “Resistance,” and he goes silent if Resistance reaches 100. Your ending rating changes based on how many lies you exposed. Horii says development took “only about 30 minutes.”
The thing to pay attention to isn’t the 30-minute build time — it’s the two-parameter design. Agitation and Resistance move at the same time, and push too hard and the whole interrogation ends in silence. That’s the exact pleasure Portopia established, reproduced in its smallest possible form. The AI built the implementation. The game design is Yuji Horii’s.
The tools change, and the person who can tell what’s fun still comes out ahead. That’s what those 30 minutes proved.
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