Kaname Date’s case moves between crime-scene investigations and dreams searched for clues. At $3.99 from Microsoft Store, this is a chance to follow that unusual detective story if its premise appeals to you. Make sure the confirmed language options suit your preferences before buying.At $19.99 from Microsoft Store, this suits players drawn to Date’s investigations across crime scenes and dreams.
Microsoft Store·Platform:Microsoft Store·~ $19.99-80%~ $3.99ALL-TIME LOWSave $16.00 vs SteamBuy now
Steam·Platform:Steam·United States Steam official price~ $19.99Buy now
All-time low ~ $3.99across Steam & third-party storesat the recorded all-time low
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Past 36 months · Updated daily
Historical Low~ $3.992025-01Current Low Across Stores~ $3.99Microsoft StoreAt its historical low now
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01About AI: The Somnium Files
In near-future Tokyo, detective Kaname Date pursues a mysterious serial killer. He investigates crime scenes and searches through dreams for clues.Steam player reviews: 91% positive from 8,924 reviews.
$3.992025-01-16 · SSteamBase game · same records as the chart above; USD history, not a regional Steam low.
Language support
Language
Interface
Subtitles
Audio
Traditional Chinese
Yes
Yes
—
English
Yes
Yes
Yes
Japanese
Yes
Yes
Yes
Steam PC edition data · 2026-10-19
02Before you buy
Investigation
Detective Kaname Date investigates crime scenes and searches dreams for clues.
Mode and language
Steam PC lists single-player. Language data specifies English full audio and Traditional Chinese subtitles.
03Frequently asked questions
What is the story about?
Detective Kaname Date pursues a mysterious serial killer in near-future Tokyo.
Can I play solo?
Yes. The Steam PC data lists single-player.
Where does the investigation take place?
Date investigates both crime scenes and dreams for clues.
Popular Steam reviews
Native-language selection · 10 reviews
Selected helpful reviews in this language show both recommendations and criticisms. This selection does not represent the overall positive rating; opinions reflect the version reviewed.
RecommendedSteam player
AI: The Somnium Files, also known as Psychonauts: Japan Edition
So naturally being made by the Japanese this game is visual novel-esque, has a mature story with extreme amounts of gore coupled with laughable moments, numerous waifus, cringe dialogue, and a plot which requires a Phd to follow.
Also no DRM because Spike Chunsoft actually don't like treating their customers like crap....like some other publisher/devs
Great game though.
Also please upboat I legit bought this at launch to write a poo-post review ;pShow moreShow less
0.1 hours at review309 people found this helpful
Not recommendedSteam player
From someone who finished the entire game and played Uchikoshi's previous works: buy this game at a discount. Like many negative reviews have pointed out, AI: The Somnium Files is not a bad game, and I would honestly give it a more positive review if the price was lowered. But alas, here we are.
What's the issue?
The one thing, in my opinion, that AI fails at horrifically: tone. I don't think I've ever played a game with as confusing of a tone as AI: The Somnium files. The opening of the game sets the story up to be a grim, suspenseful murder mystery, and that's what it is for a good five minutes. But quickly, the root of what damages the tone (and the protagonist) is introduced. Trying to keep as spoiler free as possible, throughout the story murder investigation is quickly forgotten by the main character when presented with lewd content, and this is an actual plot point in almost every route. In my playthrough, the first few times it appeared I tried to ignore it, and the first time it was actually a little amusing. But when it showed its face time after time, I grew increasingly upset and even considered dropping the game.
If AI: The Somnium files was marketed to have a protagonist in a cartoon world of crazy hijinks, then I wouldn't have an issue with it. But it's not. It's marketed as a thrilling neo-noir murder mystery. This is not the first game that throws some comedy in a murder mystery, and I'm not saying that comedy in a serious story ruins it, in fact if written nicely it can make the game even more enjoyable: take Ace Attorney for example. But it's not written well into AI. It makes our protagonist, Date, look like a complete idiot, and it was hard to sympathize in his moments of despair when a minute before or a minute after he's crying over losing a suggestive magazine. Maybe it's just me to be extra nitpicky about this part, but there were many times I outloud said "Seriously?" when this happened.
As well as this, in moments when it tries to be like Zero Escape, it makes absolutely no sense because of the different world building between Zero Escape and The Somnium Files (this issue presented itself near the end.) There's only so many times you can ignore plot holes.
What's good about it?
Overall, these things threw a wrench in the game for me, but like in Uchikoshi's previous work, the twists are still impressive, and there are some exceptionally moving character moments in the story. Two routes in particular were actually very touching in its build up and endings. When it's trying to be a murder mystery, or just a story, without any outside interference, it's pretty damn good. While there were many times I was groaning, I can say there were moments I was hanging on a characters' words in interest and shock. AI: The Somnium files is not a bad game, and to me it's disappointing that with just a little tweaking, this would be a game I'd be giving a positive review. But for what it is, it does not deserve the price it has.
Get it on sale.Show moreShow less
24.1 hours at review285 people found this helpful
RecommendedSteam player
No censorship, original ♥♥♥ voice acting, traditional chinese langauge included, made by Spike Chunsoft..
Now gimme a reason why i shouldn't buy this!Show moreShow less
0.5 hours at review222 people found this helpful
Not recommendedSteam player
AI is not bad, and I would ultimately say I have mixed feelings on it more than negative ones. However, I find myself in the strange place of only feeling comfortable recommending this game to people that are NOT fans of the Zero Escape games, and even then, I'm not so sure it's worth full price.
First and foremost, this game is considerably shorter than the Zero Escape games, at about 15-20 hours for a full playthrough, yet priced 20 dollars higher than any of those games. While there are some definite improvements in regards to visual polish, namely in the animations, I wouldn't say the increased production values are so good that they justify the price tag.
The main issue with AI is that it feels disjointed and incomplete. You really get the sense that there were many things the game wanted to be at the same time, but never really perfects any of them. The game wants to be a murder mystery with a dark and serious tone, but then jumps into sections of cartoonish, wacky hijinks that completely spoil that atmosphere. In the middle of incredibly climactic and dramatic moments, the tension will be dissolved immediately by bizzare antics, often with played-out "power of friendship" moments. As a big fan of both Phoenix Wright and Zero Escape, I'm totally fine with a more light-hearted detective game, but AI's failure to ever set a consistent tone robs the game of ever having a huge emotional impact with either its melodramatic highs, or its gritty, dark lows. This may sound nitpicky, but I am not exaggerating when I say that these tonal shifts are so jarring and strange that they made me compelled to write this review.
More than just its writing, the game lacks clear direction in basically every aspect. It wants to be a more focused adventure game, but still tries to shoehorn in the branching narratives that defined Zero Escape, even though the reason for their inclusion never really makes sense and is never really explained properly. It wants to still be sort of a puzzle game, but the puzzle sections are either entirely guesswork, with correct paths being discovered by randomly interacting with objects in subconscious dream worlds, or with solutions so obvious they don't deserve to be called puzzles. It still kind of wants to be a speculative, intellectual exploration of a scientific idea, like in Zero Escape, but also tries to focus much more on character-driven, emotionally powerful stories, most of which unfortunately fell flat for me, although one in particular was brilliantly executed.
I could go on about these flaws, but this isn't the place for it. I wouldn't say that AI isn't worth playing, but its easily the worst thing Uchikoshi has directed, and doesn't deserve its price tag. When the price drops to the 30 dollar range, I'd say its probably worth it, but until then, I would recommend sticking clear.Show moreShow less
17.8 hours at review191 people found this helpful
RecommendedSteam player
THIS IS GETTING A SEQUEL LETS GOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOShow moreShow less
21.4 hours at review122 people found this helpful
Not recommendedSteam player
Let's start off with the good parts - It's a mystery game with an interesting mystery, a couple twists that make you go "this changes everything about the things I've learned" and there are several emotional moments with great voice acting. I completed this game and don't really regret the time spent, so this is definitely a game that I can see a lot of people enjoying.
It's mostly Visual Novel with some light puzzles. Generally speaking your choices outside of the puzzles don't change the story, so don't expect anything on the level of 999 or Virtue's Last Reward. It's in a similar vein of story-telling to those two, but far more streamlined. Just manage your expectations if you like those games.
Having said that I can't really recommend this to anybody who shares my taste in games writing. The protagonist is just too insufferable. He has a heart, a backstory and some touching relationships, sure. He occasionally makes some frustrating decisions or forces you to say really stupid things - not that big of a deal. The problem for me is the downright pathetic writing of comedic relief moments.
Have you ever seen an old Looney Tunes cartoon, where a wolf sees a lady and goes AWOOOGA with stomping feet, tongue hanging out and heart eyes? That's the main character's relationship to one of the game's most prevalent and reoccurring support characters - the Porn Magazine.
There's an episode of the TV show 'Friends' that introduces a supporting character who introduces himself along the lines of: "Hello, I'm doctor So-and-So, and I love Fonzie from Happy Days!" Every subsequent appearance of that doctor in the episode then has him reference Fonzie in every line of dialog. That's the main character about porn magazines.
Have you ever seen Darth Vader, ripping himself from a Space Hospital Bed and belting out a heartbroken "NOOOOO"? That's the main character about being forced to part from a porn magazine. OR from stolen women's underwear.
Have you ever seen a man of faith fall to his knees, teary-eyed in awe of of God's great grace? That's the main character - and several more nameless goons besides - when presented with a porn magazine, or even the IDEA of a porn magazine existing in their vicinity. AND, if you were starting to really fall in love with this guy, his reaction to the idea of groping a high-school girl. He's past 30, by the way. It does not come across as all that endearing.
I am only slightly exaggerating - this joke starts off low-key in the first couple of hours but the further in you get the more frequent it becomes. By the latter half of some story branches, there is literally a reminder about how much the main character loves porn in every single scene.
There are several life-threatening action events in this game. All but one of them are resolved partially through the use of porn magazines. If you get into an action scene and ask yourself: "How will our team get out of this one?" I'm going to spoil you: Porn magazines. "But wait," you say, "How does that make sense?" The answer is - just click to the next damn textbox and do the damn quick-time event until this farce is over and we can move on.
If this sounds like a fun time for you, sure! You'd probably enjoy this game plenty. It might ruin the joke for you by repeating it endlessly without variation, but by that point you can just start aggressively clicking through to get to the interesting parts.
If this sounds like no big deal, great! Have at it, I put the positive spin up top. If that sounds like your jam, go get your jam on.
If this sounds like a pain, consider that you can just skim past the Wahoo Looney Tunes Porn Magazine stuff to get back to mystery, emotional connection and actual banter. You can't really skip the action scenes, but they're fairly short in length anyway. If you know about it beforehand, you might be able to adjust your expectations and enjoy the game no problem. Maybe.
But if you can't be bothered to sift through stuff you know you're gonna hate up-front - and honestly, power to you - then feel free to skip this one. Get one of those other games you've had your eyes on that WON'T cave your skull in with a rolled up porn magazine.
Maybe Uchikoshi will get an editor onboard for the next one.Show moreShow less
19.4 hours at review176 people found this helpful
RecommendedSteam player
An AI for an Eye
It's been a while since I was this hooked on a game and this one hooked me right from the start and didn't let go. I was supposed to just test it to see if it works on my potato laptop, but I couldn't put it down. It made me laugh, it made me cry, it made me experience a whiplash of emotions.
AI: The Somnium Files is a game by Uchikoshi Kotaro, the creator of the famous Zero Escape trilogy, and developed by Spike Chunsoft so you should expect high production values. It's an adventure/visual novel hybrid similar to Zero Escape, but this time the two segments are completely intertwined every step of the way. It gave me that same feeling of a larger looming mystery you gradually reveal in a non-linear way the previous trilogy had. It's also quite different at the same time.
Genre wise, it's a sci-fi murder mystery set in the near future where you play as the detective Date Kaname as he investigates a series of bizarre murders. Victims are set up in theatrical ways and all are missing a left eye. Incidentally (or not) our protagonist has an artificial left eye, equipped with a super advanced AI - Aiba (eyeball...yeah, puns) which serves as his partner and companion. The relationship and banter between these two is the highlight of the game. Date is a Psyncer who uses the Psync machine to enter the dreams of suspects or witnesses as part of investigation.
https://steamcommunity.com/sharedfiles/filedetails/?id=2298080382
GAMEPLAY
Whereas Zero Escape had separate puzzle and VN/narrative sections, Somnium Files has a more varied and interwoven gameplay although it doesn't have traditional logic puzzles. The bulk of the game is investigation, going to locations, talking to characters and clicking, lots of clicking (from a fixed position). Every location has numerous hotspots that a point'n'click fan in me couldn't help but click on...everything. And I'm glad I did as that way you get lots of funny comments. Actually that optional side banter is so much fun and it contributes greatly to characters and the world to feel more alive and fleshed out. It's also needed for achievements. What's more, when you go back to the same location the hotspots are active again, but the comments, jokes and puns are different every time. It's amazing how much attention to detail went into this. The dialogue is prompted through this random clicking or actual talking to characters. You have numerous dialogue options and you get to use all of them like in most adventure games.
There are shootouts with QTE, but they're rather easy. They feature a hilarious running joke. Aiba has a way of motivating Date to increase his speed (up to 3.6 times) with the power of an elusive porno mag. There are also interrogations of suspects where you present the right evidence(s) similar to Danganronpa just not timed. And these lead to psyncing.* (more in comments)
Somnium aka the Dream World is the most challenging and interesting part of the game. You control Aiba in 3D and solve puzzles. The 'puzzle' is actually in deciding what hotspot to engage with and then making a choice of action. You only have 6 minutes but that's not a problem per se, because when you don't move and just observe, the time stands almost still. But every action costs a certain amount of seconds so there's quite a bit of time management involved. The other challenging thing is that, since this is a dream world, the logic is often twisted and vague, so there's a lot of trial and error and out of the box thinking. Actually, that wandering in the 'dark' and using intuition is part of the appeal and there are often more ways than one to solve a Somnium. If you make a mistake or run out of time you can retrieve steps to previous checkpoints or just restart the whole segment from a flowchart. Somnium is also the place where routes branch.
https://steamcommunity.com/sharedfiles/filedetails/?id=2298082893
Let’s not forget this is a visual novel at its core so yes, there are routes and branches. Because of the nature of Somnia you’re not actually aware when you make a choice, exception being the first one. But there’s a flowchart that slowly shapes itself as you progress and you can jump around to any point you’ve unlocked like in Zero Escape.
STORY AND CHARACTERS
I’ve written more about gameplay than the story so far which is a first for me. That’s because it’s difficult to avoid accidentally spoiling something and that would be a great shame. It’s a murder mystery after all, structured in a way that by going through the routes and branches you slowly piece together the big picture. So the twist won’t hit you out of nowhere cause you’ll already have a lot of hunches if not the details and the mechanics. I strongly suggest going down the red path first and Mizuki’s route by choosing the left cage in her Somnium. Mizuki’s route is the most heartfelt and wholesome. The other major route, the right purple one, is more revealing and baffling, but also quite poignant. Playing the routes back to back and alternating between the two crucial branches will gradually form a mindblowing story full of twists and turns, but one that is also very emotional. It’s tightly woven with no threads hanging, more compact and less convoluted than Zero Escape. It manages to imbue the mystery with a touching personal story similar to 999.**
Characters infuse this smart puzzle with vibrant life. Most of them are fun and colourful, especially Date. He's hilarious, wacky, pervy and a bit of an idiot. Aiba is there to slap him out of his more eccentric moments and the two make a hilarious double act (she's the 'straight man' in this comedy duo) Date is a peculiar case of a protagonist, there to give us a straight male perspective (VN version at least), but is also quite an eye candy and a proper bishonen. So there's a bit of dissonance between the way he thinks like an average guy, but looks like Adonis. (Thanks for all the close-ups of his beautiful face) Although he's a 'perv' who makes a lot of stupid dirty jokes and starts glitching in presence of tiddies (standard behaviour I presume), I wouldn't call him a creep. But, Aiba would. Actually, he's often made fun of by the characters and the game itself.***
On a serious note, Date is a good, likeable character with a heart of gold.
https://steamcommunity.com/sharedfiles/filedetails/?id=2306536619
The humour may not be everyone's cup of tea, but personally I loved it. The jokes are full of bad puns, pop culture references and sexual innuendo. It was so bad sometimes that it made it even more hilarious. Some people probably won't appreciate the stark contrast between serious crime scenes and stupid jokes. But I love a good whiplash. I must note that this is only the case at the beginning of routes while the investigation is slowly rolling. When stakes become high, jokes are toned down or absent altogether. In those moments clicking things won't give you any funny lines. I greatly appreciated the gradual tone shift. Furthermore, many random lines turned out to be not so random.
This attention to detail permeates everything and that is also true of visual presentation. Everything is dynamic, character models and avatars are animated with natural body movements and facial expressions even though still a bit stylised. Instead of CGs there are cut-scenes, cinematics like in Zero Time Dilemma. Somnium scenes are the most beautiful and full of creativity befitting the dream world. Music is also quite memorable. There's a haunting main theme waiting for you right on the title menu.
I wish I could play it again for the first time. Highly recommended!
Psynced by Dugoja In The SomniumShow moreShow less
56.9 hours at review113 people found this helpful
Not recommendedSteam player
This is a really tough one. The last 1/4 of the game is actually amazing and I think this is one of the best murder mystery mixed with sci-fi elements that i'll ever witness. That being said, you have to get over a mountain of ANIME CRINGE(tm) to get there. If you're a weeb, you're already immune to ANIME CRINGE(tm) so you can just go ahead and ignore this and buy it. If you are a normal person like me, it will probably be too much for you to handle to even get to the amazing last portion. For me, for some reason, I trudged through the cringe, literally having to get up and walk away for some parts, and I was sooo close to ALT-F4'ing and uninstalling like 10 times during the Iris route... and god help you if you get that route first.
There's something about these Japanese visual novels, and even their RPGs, where it's clear the developers are so afraid to take themselves and their stories seriously for more than 2 minutes straight. When you get to the last quarter of the game, it takes itself entirely seriously and it becomes amazing because of it, and it executes an extremely complicated plot excellently. I almost want to recommend it just because of the climax. But I am one of those people that is vehemently against the "trust me, it gets good after 15 hours!" mentality where you have to wade through the ♥♥♥♥♥♥♥♥ to get to the good stuff. Because of that, I can't recommend this for the vast majority of people.Show moreShow less
22.2 hours at review155 people found this helpful
RecommendedSteam player
Not done yet, but good so far.
However, I'm posting this to give awareness that a few parts can crash, so save frequently so you don't lose a lot of progress.
reporting back since I just finished it:
Fantastic game, but as far as I know, it will still crash at the PSyncing Warehouse part. My recommendation (even though it ♥♥♥♥♥♥♥ BLOWS) is to save after every step and slowly inch yourself forwards since there's no specific point it crashes, just here and there.Show moreShow less
4.7 hours at review102 people found this helpful
Not recommendedSteam player
As a fan of the Zero Escape series (especially the puzzles) I was very excited to play this game by the same creators. However after 6 hours of gameplay I couldn't stomach any more. It feels like every other sentence uttered by the main character is straight from the mind of a horny 13 year old who thinks sex=comedy. The continuous sexualisation of the female characters, and having to hear Date's opinion on their f*ckability completely took me out of the game (and don't get me started on Aiba's female form). I get that we are meant to laugh at Date's incessant lechery, and it is almost a staple of anime and shounen-esque Japanese media, but that is partly the problem. The need to inject something sexual into every scene is so tired, cringey and overdone, it just feels incredibly cheap in a game that is supposed to be a (albeit somewhat goofy) murder mystery drama. It's sad because outside of those issues the game was fairly enjoyable. The gameplay was not what I had hoped, but the story seemed to be heading somewhere solid. If gratuitous objectification in your media is not a concern of yours you can disregard this review and have a crack at the game.Show moreShow less
6 hours at review139 people found this helpful
Source: original Steam user reviews. Helpful votes are an archived snapshot, not live data. Last collected: 08/15/2026.
