
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 160 reviews with recorded playtime.
Reviews
Themes across 160 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
探偵グリモワールシリーズ最新作 今作はロンチから日本語対応されています ありがたい…! 過去作とのつながりは一切ないですが、過去作を知ってるとニヤリとできる会話がちょいちょい出てきます。 ポイントアンドクリックの推理アドベンチャーゲームです 基本システムやぬるぬる動くアニメーション、フルボイスはそのままに、今作は証拠品を3Dモデルでぐりぐり動かして見れるようになったことでさらに推理探偵っぽさがパワーアップ 謎解きは相変わらず割としっかり聞き込みして文章とかも読まないと難しいです。 PVやSSもガッツリネタバレになってしまうので注意。 ちなみにロンチだとこのゲームの定価のお値段とほぼ同じくらいでシリーズ全作がそろったバンドルを買えちゃいます。めっちゃお得です!!!
This game was definitely well worth the wait! I first wishlisted this game close to when it was announced in December of 2023 and have been keeping a close eye on its development, especially since I was such a major fan of Tangle Tower after discovering it on Apple Arcade. As with Tangle Tower, the art direction, mystery, puzzles, and music are superb, with the new 3D models for the clues being absolutely stunning! I truly believe there is no other games like the Detective Grimoire series, all of them just ooze with pure passion, talent, and love for the medium of video games and point-and-click mysteries. An absolute must play and one of my favorite games of 2026. Hope to see Grimoire and Sally in another 7 years (or whatever SFB Games puts their passion into)!
Loving this. What a great entry for this series. The voice acting! The characters and environments and mysteries ... there are so many little moments in the dialogue that made me laugh out loud to myself. Amazing work.
终于出了续作,上次玩还是看陆夫人玩前作瞬间被圈粉立马入手到现在已经好几年了,SFB赶紧给我出续作啊!出必买!
Yes they did it! A few years after the great Tangle Tower, SFB Games manage to double down and make the fourth Detective Grimoire installment another great detective game! It's great to see those game evolve so much between each episode. Even though The Mermaid Mask juste looks from afar like "The successor to Tangle Tower", lots of subtle details have been added once again to make it even more nicer to play. Among which, the full modelisation in 3D of all clues, whuch definitely helps fo fully fledge out the "detective vibe". Art is there, music is there, I love how the story and characters manage to feel so unique and whimsy at the same time, without looking in any way like something that's been done before on any previous installment. It was a great to havethe opportunity to dwelve again into a Grimoire and Sally adventure, and have a new glimpse at the universe surrounding them. If SFB Games wanna try their luck at yet another installment, I will be up for it, as it seems the world has still so much to offer. Definitely a series that does not pale in comparison, and can stand proudly amongst the Ace Attorney and Golden Idol series to just name my favourites.
No spoilers here. I just beat it. Nothing went as I predicted it would, and yet the ending didn't feel like it came out of nowhere. Characters amazing, as always. Writing just as funny as ever. Art, both background and character, was stunning. Music was gripping, just like the first game. Every aspect of this game was crafted with love and care.
缓慢推进中,目前进度51,除了船的步数那个比较难看了别人实况外,还挺简单的。也看到好多熟悉的名字,期待后面的剧情。。。
This game is one of few point and click games that I could play over and over again without growing tired of it; the art is impeccable and the sound design and music to accompany it creates such an immersive world and adds to the depth of it's characters. Speaking of the characters, I simply couldn't get enough of them; each one was so jam packed with personality it made listening to all of their dialogue so worthwhile and borderline addicting. To put it simply there is no way you could hate this game, the arcs are too tight, each chapter leads to the next - beginning, middle, end - and bang. Not a line wasted.
Se você gostou de Tangle Tower, esse jogo é mais do que recomendado <3
La construction est plutôt similaire aux précédents opus. L'humour, les voix, les caractères et les puzzles sont toujours aussi bons. J'adore cette série, je l'attendais depuis un moment et je ne suis pas déçu !
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
Estimated from the language of this game's reviews — a proxy for where players are, not official Steam demographics.
Audience
Games most often reviewed by the same players — an audience-affinity signal from our review sample, not full ownership data.
Related
| 2Dark | $343.1K | 867 | 78% | $24.99 |
| UMIGARI | ウミガリ | $342.4K | 1K | 82% | $12.99 |
| New Star™ Soccer 5 | $343.3K | 868 | 70% | $9.99 |
| Summer's Gone - Season 1 | $343.3K | 705 | 94% | $14.99 |
| Dread Flats | $343.3K | 1.6K | 84% | $5.99 |
| Jerez's Arena Ⅲ | $343.4K | 618 | 91% | $19.99 |