
An impossible locked-room murder: Captain Mortuga lies dead beside an ancient cauldron aboard the world’s strangest submarine, crewed by sketchy suspects. A handcrafted point-and-click with sharp humour and tricky puzzles. Dive into the next mystery from the creators of Tangle Tower & Crow Country.
Modeled estimate, not a reported figure. How we estimate →
Prices
The United States storefront in every case, so this compares stores and not countries.
Prices
Each in the currency that store quoted — not converted: the gap between two rows is the publisher's pricing, not an exchange rate.
Every market we collect.
About
In the pitch-black waters beyond a long-abandoned fishing town, the enigmatic captain of the world's strangest submarine has been murdered. Some say he was an immortal time-traveller. Others say he was a vampire, cursed to stay hidden beneath the waves forever...
Found alone in a locked room, with only an ancient stone cauldron to suggest how he might have died, it's up to Detective Grimoire and Sally to piece together what really happened. Was it a curse, released from the cauldron? One of the submarine's eccentric crew? Or does the bizarre truth run even deeper...
• Every clue is a fully realised 3D object waiting to be examined for hidden secrets
• Grimoire and Sally are back, and joined by a fully voiced cast of mysterious suspects
• A hauntingly beautiful original soundtrack performed by the Budapest Art Orchestra
• Explore every hand-painted inch of The Mortuga Submarine, where not all is as it seems...
*Voice audio is only in English
Genres
Sums Steam only; PlayStation publishes no volume signal, so the true total is higher by an unknown amount.
| Store | Price | Audience | Score | Chart | Est. revenue |
|---|---|---|---|---|---|
SteamYou are here | $19.99 | 2.9Kreviews | 99% | — | $1.1M |
| $19.99 | 69ratings | 96% | — | not modelled |
Matched by title — a reused name can pair the wrong games. * is a critic aggregate. Prices and positions are each store's United States storefront; Epic charts worldwide. Audience and Score too, except Steam's, which is worldwide.
Engagement
Reviews
Themes across 1527 recent reviews and how positive each mention is. A keyword signal, not full sentiment analysis.
Reviews
Genuinely enthralling (as my unbroken, 10-hour, went-until-3-AM playthrough can attest to). It's got gorgeous art, captivating writing, and amazing voice performances, all tied up in a setting and story that I actually found kind of terrifying at times. You'll find few mystery games more worth your time, I'd wager.
I thoroughly enjoyed every moment of this game. I cannot recommend it enough. If you like a good mystery, good puzzles, and good writing, give it a try.
Media

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Price dynamics, follower growth, revenue and sales trajectories with interactive tooltips
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Stats
All-time low is the lowest price we've recorded for this game since we started tracking it.
Languages: English*, French, Italian, German, Spanish - Spain, Japanese, Korean, Portuguese - Brazil, Russian, Simplified Chinese, Spanish - Latin America, Traditional Chinese*languages with full audio support
Hours played at review time, across 1.5K reviews with recorded playtime.
positive critical· bar length = how often the theme comes up
the game has nice plot. Very least plot holes. But the best parts are game design, 3d clues and my best of all, narrations. I really love the ending tbh. [spoiler]i mark spoiler because there is a weakness that is the spoiler. they are 2 riddles that i find to be the hardest which i really don't like. are the Machine with 3 magnets and panels to cover that you have to precisely cover them and the mushrooms which you have to count how many mushrooms on the board. but you have to shine lights and then stop to determine the 4 words of "types of mushroom". especially to me as Vietnamese who just got 6.5 IELTS since it's too scientific. [/spoiler]
Tangle Tower (el juego anterior) ya era una de mis novelas visuales favoritas. Me sorprendió MUCHISIMO como pudieron mejorar tanto un juego con respecto al otro, cuando, aparentemente no le notaba defectos a su precuela. El nivel de pulido de este juego, sus puzzles, su narrativa, su arte... Por dios, no hay manera de describir lo mucho que me gustó desentrañar los misterios detras de este asesinato. :)
It's good, buy it.
A very well written story with extremely high production value, especially in the art, animations and voice acting. I enjoyed the supernatural elements of the narrative that possessed just enough ambiguity to burrow into your mind and linger after the credits roll. The game is quite easy but of reasonable length (depending on how much you engage with the clues and suspects). Certainly well worth the price tag for the overall quality of the experience. The detective elements are overall lighter than games like Return of the Obra Dinn and the Golden Idol games but still satisfying and enjoyable despite their simplicity. Highly recommend.
Muy bueno, hubieron mejoras para esta entrega y yo creo que estuvieron bien implementadas, aunque el humor a cambiado utilizaron mayor cantidad de "word puns" que en ingles se entienden pero que en otros idiomas se pierde un poco la gracia.
My favourite game of 2026! Loved Tangle Tower, loved Secret of the Swamp, was so excited for Mermaid Mask and was not disappointed! Incredible design in all areas, fab music, and such fun object interactions. Amazing game from SFB, always a blast to see their mystids and recurring characters <3
Fantastic voice acting strong and engaging story fun dynamic between the leads great game over all
Is good. A very good game with fun puzzles and a compelling mystery, tied together with witty and punny humor.
Selling now
See how fast this game is selling right now — estimated copies and revenue per day from recent review growth.
Active players
Estimated daily and monthly active players (DAU/MAU) modeled from peak concurrency.
Players by region
Where this game's players are, estimated from review languages.
Players also reviewed
The games this title's players most often review too — audience affinity.
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| $1.8M | 6.8K | 95% | $19.99 | |
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| Game | Estimated lifetime revenue | Reviews | Review score | Price |
|---|---|---|---|---|
| $1.1M | 3.6K | 81% | $9.99 | |
| $1.1M | 1.3K | 90% | $19.99 | |
| $1M | 1.7K | 63% | $19.99 | |
| $1M | 2.9K | 89% | $14.99 | |
| $1.1M | 7.7K | 94% | $12.99 | |
| $1M | 2.6K | 96% | $11.99 |