
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 | 2.8Kreviews | 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 1520 recent reviews and how positive each mention is. A keyword signal, not full sentiment analysis.
Reviews
I liked the characters more in Tangle Tower but the sequel was still just as amazing. They did a better job with the ending too. Really hoping they make another sequel
So worth the wait!
I feel fortunate to have had steam recommend me this game - unbelievably charming and a joy to play from start to finish. the puzzles are fun and interesting, the story and characters are well-written, the voice acting and music are both great, and the art ties it all together. can't say enough good things about this game. looking forward to playing more from this studio.
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
好玩!
Great artwork, voice acting, story, and gameplay!
A wonderful leap forward in narrative, design, and execution from Tangle Tower. It was exciting to see how the team has honed in their craft. Every conversation point is well written and the game is without any generic statements or wasted space. The chemistry between the two detectives is great and makes for a fun journey while solving the mystery. The Mystery this time is the biggest level up since Tangle Tower. That game had a great mystery box, that was unfortunately lackluster once opened. The premise to the murder this time is a wonderful closed mystery room that actually delivers and a superbly crafted and well delivered resolution that exceeds expectations as a murder-mystery narrative.
yes
I LOVED tangle tower and I was so excited to know SFB was making another similar game! And it's just as amazing as I imagined!! It has all the pros of the last game - incredible orchestral soundtrack, unique, memorable characters, enthralling story, creative puzzles - and somehow makes it even BETTER with new ways to interact with evidence, even more commentary from the suspects, and plenty of callbacks to the previous games. It was so much fun trying to piece together all the connections and what it could all mean. But even without any knowledge from the previous games, this one still presents a captivating mystery that stuck with me even when I wasn't playing. SERIOUSLY recommend!
Felicia! When I catch you Felicia! Another great continuation in the series. This game really benefits from you having played the pervious one, Tangled Tower, however it's not necessary but there will be clear easter eggs you won't get. And the seemingly continuation of the mystery around Felicia is something I hope they keep going. There's many clever things to be done with her character and the mystery around her and I'm excited to see where the devs go with it should they choose too.
Cara, o que dizer sobre a SFB? Conheci eles com Tangle Tower, e descobri depois que eles haviam feito o meu jogo de infância preferido, e para minha felicidade eles haviam anunciado outro jogo do Grimoire, o Mermaid Mask. Então, o que dizer sobre o Mermaid Mask? Um jogo 10000/10, os caras conseguiram pegar o que era incrivel em Tangle, e melhorar mil vezes. A história é muito cativante do inicio ao fim, eu queria terminar logo e mal conseguia parar de jogar; os personagens incriveis. E você nunca desconfia do culpado, e nem do que realmente vai acontecer. Da para perceber o carinho que eles poe nesses jogos, e principalmente quando você le as anotações da galeria de arte, e digo, parabéns a todos que trabalharam no jogo, e nas artes. Gostaria que muitas pessoas conhecessem esse jogo pois VALEU CADA CENTAVO.
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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