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Detectives Grimoire and Sally investigate a locked-room murder aboard a submarine, questioning its crew, examining clues, and solving puzzles.
Released 16 Jul 2026
Inspect 3D Clues
Question Submarine Crew
Explore a Strange Submarine
Detective Grimoire and his partner Sally investigate the murder of Captain Mortuga, found dead in a locked room aboard an unusual submarine. The crew members are suspects, and the circumstances of the death remain unclear.
Explore the submarine’s rooms, inspect clues and objects, and question the crew. Evidence can be brought up in conversations, helping the detectives uncover information about the suspects and their connections to the case.
Solve puzzles and piece together the investigation as it unfolds. Clues can be examined as 3D objects, while notes organize evidence and what characters have said about it; hints can help when a puzzle proves difficult.
Developed by SFB Games · Published by SFB Games
Players repeatedly praise the characterful writing and dialogue, memorable cast and voice performances, and the submarine’s visual style and atmosphere. Many also enjoy following the mystery through its clues and appreciate the puzzles, though opinions differ on their difficulty and how much evidence-based conversation the investigation requires.
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
| Platforms | Windows, macOS |
|---|---|
| Achievements | 21 |
| Age ratings |
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| Controller support | PlayStation, Xbox |
| Controller required | No |
| Demo | View demo on Steam |
