
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 1529 recent reviews and how positive each mention is. A keyword signal, not full sentiment analysis.
Reviews
One of the best deduction games i've ever played
A perfect sequel! No notes! I had a GREAT time playing Mermaid Mask, just as I did playing Tangle Tower. They're both delightfully written, have gorgeous art, and are very funny. Definitely worth playing!
This studio just keeps getting better - keep em coming! Great mystery, great storytelling, awesome puzzles (only 1 or 2 that were a miss for me, rest were incredible).
Media

Related
Related
Price dynamics, follower growth, revenue and sales trajectories with interactive tooltips
This and every other Pro feature is free until October 20, 2026. A free account is all it takes.
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
Mało kto potrafi zaprojektować growy whodunit tak, jak SFB. Trafili na swoją złotą formułę już przy Tangle Tower, a tu dodatkowo ją doszlifowali.
Another masterpiece of a Detective Grimoire game! Was a wonderful experience I am simply sad to be finished with. Can't wait for the next one in the series!
Funny and interesting point and click detective game. Well written and fantastically voiced.
A great game in a great series. If you like cozy puzzle detective, this is the gold standard. Fully voice acted, great art, not very difficult on either puzzles nor the mystery itself, but not too easy either. I got a bit stuck on one puzzle that I had to look up, and I had basically solved it but had one minor error. The only negative about this game is that now that Ive completed this one, I cant go play another one that is just as good, and get the same type of experience. Please make another one in the series, thank you <3 PS: It did not take me 33 hours of active time, I couldnt put it down so I fell asleep in bed with it, so remove like at least 8 hours :P
awesome game can't wait for more
I wish I had known about SFB Games forever ago, I could have been ultra hyped for The Mermaid Mask and bought it sooner. This was immense fun. [spoiler]At the end they mention how making games like this is not sustainable, it truly is a sad thing. They develop and publish their own games, I do hope they can continue, but I also hope they're able to live their lives too.[/spoiler]
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.
Related
| Game | Estimated lifetime revenue | Reviews | Review score | Price |
|---|---|---|---|---|
| $1.8M | 6.8K | 95% | $19.99 | |
| $607.9K | 1.8K | 92% | $14.44 | |
| $83.2K | 291 | 87% | $15.99 | |
| $37.1K | 183 | 87% | $9.99 | |
| $13.2K | 109 | 95% | $8.99 | |
| $3.2K | 13 | 62% | $14.99 |
Related
| Game | Estimated lifetime revenue | Reviews | Review score | Price |
|---|---|---|---|---|
| $1M | 1K | 87% | $34.99 | |
| $1.1M | 1.3K | 90% | $19.99 | |
| $1M | 2.9K | 89% | $14.99 | |
| $1.1M | 7.7K | 94% | $12.99 | |
| $1M | 2.6K | 96% | $11.99 | |
| $1.1M | 3.1K | 80% | $14.99 |