
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% | — | $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 1498 recent reviews and how positive each mention is. A keyword signal, not full sentiment analysis.
Reviews
Ооо, да! Я ощутила себя настоящим детективом, стиль мое почтение, сюжет интригует, игра на 13 ч прекрасно проведенное время. Чувствуешь когда делали с душой. Отдельное спасибо за локализацию на русс
전작 탱글 타워를 좋아해서 이번에도 재미있게 플레이 했습니다!
A must-play, with quippy dialogue, beautiful animations, and a very interesting story. Lots of attention to detail and a satisfying ending. Good as a standalone, but I highly recommend playing Tangle Tower first because of the number of references to it.
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
genuinely beautiful and an amazing mystery
A very solid detective game. Visuals and voice acting are top notch.
Very much worth the wait! Once again, incredible character designs with such gorgeous writing.
This is easily one of my FAVOURITE stories and games, if not the best. I like the Tangle Tower a lot but I did not expect the Mermaid's Tongue to be THIS GOOD!!!! I binged play it as much as I can (and was surprised it gave me 10+ hrs of gameplay wow). The story was very well written and the logics flows very smoothly to me in the end (this feels so satisfying as not all clues seemed apparent to me in the middle of the game). And I was very pleased to see some connections between the games of the franchise. The story was mysterious, eerie, tragic yet heart-warming, humorous and lively at the same time! It will definitely have a place in my heart for a long time. Also I can't stress how much I love the characters, the animations and the voice acting!!! I would say the whole team has outdone themselves - again! I can't wait to see the theme of the next story (personally I prefer this one compared to the Tangle Tower, but please surprising me). (It's my first time writing a review this long so I hope this shows how much I love this franchise and the team will be able to receive my love for their work!)
Absolutely amazing experience. Anyone with a love for mystery will be spoiled rotten by this game. Buy it and play it so the team can make more (if they are so inspired). Until then, see you next time, Grimoire and Sally.
It's another amazing entry in a great series, the mystery kept me invested throughout. The best parts are the story, the character design, and [i]the music[/i]. The clues really fit together, it felt like any question I had or irregularity I noticed was eventually exposed and answered. It also tied into the previous games, especially Tangle Tower, in exciting and rewarding ways. Sometimes you figure something out way before you're allowed to ask a character about it properly, but that's a common occurrence in a lot of mystery games. The only times I got stuck were when I missed 1-2 clues in the background, and on the one puzzle that I felt wasn't explained/implemented well ([spoiler]the pinboard near Moon's tent[/spoiler]). The characters were a lot of fun to interact with, the ending was amazing, and the mystery was very well-constructed. I'd absolutely recommend this to anyone, in my opinion it's well worth the full price!!
Ein ganz wundervolles Point-And-Click Game. Man sieht die konsequente Weiterentwicklung aus den Vorgängern. Die Rätsel haben mir gut gefallen. Voice-Acting und Soundtrack fand ich exzellent. Bin wirklich traurig, dass ich es durchgespielt habe und hoffe sehr, dass es mindestens einen Nachfolger geben wird!
Selling now
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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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