MIAZMA or the Devil's Stone

MIAZMA or the Devil's Stone

Private Moon Studios · 2018 · Adventure, FMV, Point & Click

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Screenshots

About MIAZMA or the Devil's Stone

Jonathan Hunt is a journalist from New York. Solving the case of Yoomurjak’s ring earned him the reputation of an expert of mysteries in the past. This time he is asked by a nuclear physics institute to throw light upon a disappearance, but the mission turns into a hunt for a peculiar meteorite that fell on earth centuries ago. What is inside the devilish stone? There must be a good reason why certain persons have been trying to get hold of it at all costs.

Playing as the main character in third-person perspective, you will
- Investigate a curious disappearance and search for clues
- Decipher secret documents
- Solve puzzles left behind from the past
- Explore the enigmas of obscure laboratories in a top-level scientific institute
- Interview characters about what they know and what they do
- When in trouble, use the laws of nature and common sense to escape
- Unravel the legend of mysterious cosmic treasures and prevent disaster!

Key features:
• Immersive storyline
• Third-person perspective
• Live-action cinematic scenes
• Over 20 real locations to explore
• Over 20 characters by excellent actors and voice artists
• A series of puzzles and challenging tasks perfectly integrated in the plot
• Smart apps for various tasks
• Easy mode: optional tutorial, in-game hints and skip-puzzle functions
• Logged dialogues
About the previous episode: Yoomurjak’s Ring
The story begins when Jonathan Hunt, a journalist from New York, arrives in the city of Eger in Hungary for a break. He has local ancestry and speaks the language, but this is not the only motive for his visit. In the heritage of his great-grandfather, the globetrotter professor Samuel Hunt (known from the Agon series), he found two letters dated back in 1898. The letters were from a somewhat lunatic Hungarian scientist about a time machine he claimed to be working on. The references point to Eger, and Jonathan wants to find out what happened to the man and his preposterous invention. But soon he realizes that someone is desperately trying to stop him…

About the development of Miazma
Like Yoomurjak’s Ring, this title is also an FMV adventure game, developed by the same crew. It takes you to real locations with live-action cinematic approach. The game designer is Pierrot, also known for his adventure game series Agon.

Miazma was developed with the support of the Institute for Nuclear Research of the Hungarian Academy of Sciences (Atomki) in the framework of scientific project Understandable-available physics. English localization was supported by EPS, NuPECC and ENSAR2. Additional supporters: KIA Motors Hungary.

What Steam players say

Recent verbatim reviews from Steam — separate from playze.io community reviews below.

Recommended Feb 9, 2026
Well this sucks! Anyone else notice the pattern of Steam creators who make an otherwise good game, players encounter a game breaking bug, then the developer disappears and never answers?! This WAS a very good FMV - not cheesy, good locations, characters, story etc - then I encountered the PLASMA Puzzle and cannot progress. I even used the Skip button but it doesn't let you progress. My gripes are.. cut-scene with every location change (once would have been enough!), Too many locations available, only to be the wrong one which creates lots of unnecessary backtracking for no reason, too many objects with too many characters only for them to say, I don't know about this. Most of the puzzles were just mega difficult or completely dumb. And never ever an in-game hint about what to do or where to go next. Not even the slightest nudge. But despite all of this, it was a very good game up until the bug. IS THE DEVELOPER EVER GOING TO ADDRESS THIS??!!!
3 found this helpful
Not recommended Apr 16, 2026
A full motion video point-and-click adventure game with an intriguing setting and with a promising premise that is substantially encumbered by questionable design choices and by terrible puzzles. Positive: - All characters are interesting and purposeful, exuding wit and charm with every contact. Their dispositions are distinctive, unique, and congenial. Interacting with the varied cast of persons is a pleasure, and taking part in conversations with each individual is rewarding and engaging. Learning about each of their vocations, concerns, and motivations expands the scope of the adventure in ways that are intricately connected and relevant to the ultimate goal, further enhancing an escalating event that ripens slowly and profoundly with the passing of each in-game day. - Debrecen commands the dual qualification of operating as both a splendid city and as a figure of influence. Within its environs, residents and citizens of the past and of the present embody and signify a deep cultural resonance that is recognizable with each step of the investigative journey. Its borders, roads, and structures display visages of historical dignity and contemporary beauty, existing in the world wi…
2 found this helpful
Recommended Jan 8, 2026
I really enjoyed [i] Miazma: The Devil's Stone [/i] and honestly think it was better than the first game. the story picks up in a cool way, and the voice acting was pretty great, which made the characters feel more understandable, and you weren't too late with reading the subs, lol. the devs didn’t exactly expand on the original concept (about the main character etc.), but it still felt like another good part of the story. the gameplay and visuals also got a nice boost compared with the first part. the only thing I didn’t enjoy was the last puzzle — it was pretty tough and kind of took away from the flow. as for Jonathan, the main character, I wasn’t a big fan of the fact that he was after so many women and seemed like a bit of a womanizer, which made him a little less likable. he also sometimes behaves very arrogantly, but I think that was just his character designed by the devs from the begining. [b] overall [/b], if you’re into FMV games, I’d definitely say give this one a shot. it’s def a solid sequel,
2 found this helpful
Recommended Mar 25, 2025
Good FMV game from around 2007, Pros: A big pacing and cinematography improvement from Yoomurjack's Ring. There are some tough puzzles in here, but they are all in the last half. Interesting use of Hungarian physics history Cons: Mild amount of 90's level misogyny. All 3 women are physicists, but there's a weird demonstrative tone with them Acting isn't great, but it's mid level compared to other FMVs
2 found this helpful
Recommended Jun 9, 2026
Definitely not as good as the previous Yoomurjak's Ring because it's half the length, has no world exploration and no FMV for the dialogue (only an image slideshow) but it has more action early on. Still a pretty cool puzzle adventure game that I enjoyed and would play again. P.S. You'll sometimes see Jonathan do some pretty funny stuff if you wait half a minute at certain locations!
Recommended Oct 10, 2025
Miazma or the Devil’s Stone, developed by Private Moon Studios and published by M.INDIE, is a modern continuation of the classic live-action adventure format that blends mystery, science, and the supernatural through full-motion video storytelling. As a spiritual successor to Yoomurjak’s Ring, it revisits the investigative exploits of Jonathan Hunt, a journalist whose curiosity once again leads him into a labyrinth of strange disappearances and ancient secrets. Set primarily in Hungary, the game invites players to explore a world of cryptic scientific experiments, forgotten legends, and shadowy institutions, all centered on the mysterious “Devil’s Stone,” a meteorite shrouded in myth and danger. It’s an experience that wears its roots proudly, embracing the charm and ambition of traditional point-and-click adventures while translating them into an FMV framework that feels more cinematic than nostalgic. From the moment the game begins, Miazma establishes a tone that is both grounded and unsettling. Jonathan Hunt arrives at a research institute where one of the scientists has mysteriously vanished, leaving behind a trail of clues that connect to a centuries-old artifact with potenti…

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