
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 →
Media

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
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
Engagement
Hours played at review time, across 240 reviews with recorded playtime.
Reviews
Themes across 240 recent reviews and how positive each mention is. A keyword signal, not full sentiment analysis.
positive critical· bar length = how often the theme comes up
Reviews
It's good
This is one of my new favorite games, all the puzzles are super well thought out and the art and music are beautiful. If you enjoy puzzle games or a good murder mystery you have to play this game!
Спасибо за игру! Тот случай, когда разработчик любит свое дело, а не только деньги :) Игру ждала после прохождения Tangle Tower год назад. Как по мне, тут идеально сочетается анимация (как будто читаешь новеллу) и головоломки. И учитывая, что я их прошла без доп. подсказок, их сложность вполне адекватна. Отдельная благодарность за русский перевод (до последнего думала, что его не будет)! Проходить детективы на иностранном языке труднее, чем кажется: значения слов и выражений могут быть совершенно разные на английском (тем более, если дело касается длинных текстов, страниц со статьями из газет...), а это очень влияет на сопоставление фактов и понимания в целом ситуации.
A YouTuber I frequently watch played the studios first two games and I fell in love, so I was excited as I heard a third one was planned and was determined to play it myself. I. LOVED. IT! There's so much love poured into this project, the story, the characters, the clues, the puzzles. Everything is done with love in this game. Play it. Please. It's so worth it.
ya me lo he terminao sacad otro porfa gracias. Es simplemente perfecto
Mermaid Mask is a fantastic stream with gorgeous animation, clever writing, and puzzles that stay engaging from start to finish. A beautifully crafted experience.
Definitely the best game in the series! There was a very interesting plot circulating around the main mystery, such fun and deceptive characters. The music was killer and the writing great. Huge fan. 11/10. Great voice acting, fun and colorful design, easy to follow point and click, more plot than puzzles.
Great art, intriguing story, fun time
Another excellent game from the SFB folk. I have been a fan of all 4 detective grimoire game (yes, even the flash game on armor games where it all started) and this one is the best one yet. The art and voice acting are excellent, the murder mystery was also pretty interesting (including the reveal and motive for why it happened) and the puzzle were all excellent. I only had a small trouble with a single one of them due to my own confusion, but none of them felt illogical and were actually pretty well crafted. The entire cast was also very interesting. Overall, an excellent game! Definitely recommend it!
everyone play this right now so they make 100 more games, I need them
Related
Related
Trends
Steam followers (game-group members) tracked daily from when we started recording.
Momentum
Pace estimated from the game's recent review growth (our daily snapshots) at its own sales-per-review ratio — a momentum signal, not booked sales.
Audience
Audience
Games most often reviewed by the same players — an audience-affinity signal from our review sample, not full ownership data.
Estimated from the language of this game's reviews — a proxy for where players are, not official Steam demographics.
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