
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
Better than the previous game in every way without trampling its legacy. The killer reveal and story after it were handled much better than the previous game as well. The characters besides the killer were also very interesting and well designed. The game is 10ish hours if you take your time really consider every line of dialogue. Great for any returning fans or mystery fans in general. Playing the previous entry is something I would heavily recommend but isn't totally necessary.
10/10 murder solving game
Finished the game, every character is fully voiced with an amazing OST and the gameplay is much longer than the previous installation in the franchise. Every character has an opinion on every item you present them! The only qualm I have is that to get any missing achievements; you will have to replay the whole game since it saves after a certain scene that won't allow you to explore the rooms. Aside from that, this game is a MUST TRY if you liked the previous games. Also, I hope the devs will add steam point shop items for this game, I'd buy them in a heartbeat.
답답하거나 너무막힐 때마다 친절한 가이드가 있어 매우 친절한 추리게임입니다 짧고 아쉽다고 느껴질 정도로 좋았어요 후속작이 더 많이 빨리 나오면 좋겠네요
Waited for this totally absolute masterpiece (again!!!) I love everything about this game the story, the mechanics, the voicing, the music, THE ART THE DIALOGUES YUM!!!!!!!
I can't wait to re-play it and note down all the clues within clues the developers left. Incredibly polished game. Best in the series. If you're looking for a visual novel detective story, this is up there with Phoenix Wright and Professor Layton.
A magnificent continuation to an already great franchise. Those who enjoy mysteries, sharp and witty writing, excellent voice work and art direction: look no further. It is worth it!!
An absolutely thrilling story from start to finish. I absolutely ADORED the dialogue, and all the characters were so incredibly fun. Absolutely an amazing addition to the Grimoire series of games.
i hate taking breaks with this one, its too good to stop. i love these games, the characters are amazing, the music is catchy, and the cases are interesting. i want this series to never stop. dont be like J.D. Wirman.
进度只到 33%, 目前感觉案件要比前作 TANGLE TOWER 要稍微复杂些,搜到的物品也更多。谜题稍微需要想一下但也不难。如果喜欢这个系列的可以闭眼入。
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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