
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 200 reviews with recorded playtime.
Reviews
Themes across 200 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
An amazing upgrade, improves upon every aspect of Tangle Tower. Great for lovers of Ace Attorney & Professor Layton style games.
[i]Just the way it's meant to be. [/i]
I started following SFB games since the release of Crow Country and got on my PlayStation back in 2024. Earlier this year, I finally decided to checked out the Detective Grimoire series. Each Grimoire game improved with Tangle Tower being the most recent and best out the series until this one came out. I kid you not, this is flat out my favorite game not only out of the Detective Grimoire series, but in my opinion, the best game SFB games have released. The story for this one hits, the puzzles were really fun and creative, the cast were so much interesting this time around that it help make the plot more interesting. The new 3d chibi for some scenes looked great and when the story ended, I was left stunned at how much this exceeded my expectations. Fantastic OST, great usage of 2d artwork and 3d models, perfect atmosphere and sets for each area and room. I hope the series continues as I feel like the story isn't done just yet and there is still more to tell, especially since this game really ties the last two grimoire games into this one. Maybe the return of some familiar faces, who knows. For now, this game feels like a great ending point. Till next time Grimoire and Sally.
The writing's great. The music's a bop. I was engrossed the whole time. The game doesn't insult your intelligence. I highly recommend this game if you love detective games or logic puzzles.
👍
wow. what a game.
Fun.
It's FREAKING AMAZING. I couldn't stop playing it
Good sequel. I, for one, will buy as many of these as the developers choose to make.
和缠结塔比起来进步好大!角色塑造太有特色了特别喜欢......对了你们想看红绿侦探讲相声不
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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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