
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
If you loved Tangle Tower, you will also love Mermaid Mask! Another great point and click detective game with great voice acting and storytelling. I love all the quirky characters! The ending was much more satisfying than TT. Although you don't need to play TT before MM to understand the characters and the story, the lore eluded to throughout make it worth playing TT first in my opinion. There is even a reference to the original game (Detective Grimoire) hidden in the story! The puzzles were interesting and challenging, but not so hard that you couldn't eventually figure it out on your own. And the hint system is a great helper if you feel truly stuck.
Great fully voiced game. Highly recommend this fun who did it mystery game. Please support this gem. Its not often that you get high quality games like this. Would love to see a sequel.
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
8/10 Every character was great. From design to voice, each one felt alive and wonderful. The story was stronger and better than Tangle Tower. Loved it. I did not see the twist coming and they were well executed. Some of the puzzles just needed better UIs or a better description on what to achieve. Some were just confusing or too difficult.
Very naiz
These Detective Grimoire games just keep getting better.
Great game. Puzzles aren't too bad. Except for one later on ([spoiler] pirate keys [/spoiler]). I didn't guess the culprit correctly this time. But there is cool foreshadowing such as ([spoiler] Gripp being the only one to point out the necklace fragment on the iron bell and him being called number 2 by Sym when you talk about the suspects with her[/spoiler]. Overall, very fun game and a step up from Tangle Tower. More compelling killer this time around.
Listen. Secret of the Swamp is one of the best games ever. Tangle Tower is like ten times better than it. And Mermaid Mask is ten times better than *that.* Just get all of them.
Absolutely amazing experience. SFB Games really know how to make an amazing detective game!
Excellent game. I started with Tangle Tower and then played the previous game in the series. The Mermaid Mask feels like an even more focused and well written game than the previous installments, though I love them all. The characters are very memorable and well designed and acted, and I found the puzzles fun. They were neither too hard nor too easy, in my opinion. The story had some interesting turns, and I liked the little nods to the previous games. In this series, I really enjoy how the main mystery connects to some supernatural elements in the world, and The Mermaid Mask takes this even further! Definitely recommend this game even if you haven't played the others.
10/10 game, they did it again! Another absolute banger game with incredible art, animation, plot and voice acting. Genuinely an all around great game! 100% worth buying and playing!
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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