The Mermaid Mask Wiki
The Mermaid Mask is a hand-drawn detective mystery from SFB Games, released July 16, 2026 as the latest chapter in the Detective Grimoire series. Detective Grimoire and Sally Spears board the Mortuga Submarine to solve a locked-room murder at sea. This wiki collects spoiler-aware walkthroughs, puzzle solutions, maps, and tracking tools so you can investigate every deck without getting stuck.
Last updated: July 2026
Quick Start
New to the Mortuga case? Start with controls, core gameplay, and the hint system before diving into the submarine.
Walkthrough Progress
Follow Detective Grimoire from the Stonetop Inn prologue through the Mortuga Submarine crime scene and crew interrogations.
Prologue
Meet the cast at Stonetop Inn and learn why the Mortuga voyage turns deadly.
Submarine Sweep
Explore every compartment of the Mortuga Submarine and catalog physical evidence.
Illusion Theatre
Investigate the locked-room crime scene after restoring Control Room power.
Child's Room
Card lens chest puzzle, glass eyeball clue, and Symmetry Silkmoth introduction.
Crew Interviews
Cross-examine suspects, catch contradictions, and narrow the list of possible killers.
Puzzle Solutions
Step-by-step solutions for every logic puzzle aboard the Mortuga, from dial locks to compass boards.
Submarine Map
Orient yourself across Stonetop and the Mortuga Submarine with labeled location guides.
- Map Overview High-level layout of every explorable area in The Mermaid Mask.
- Stonetop Inn Rooms and points of interest at the inn where the case begins.
- Town Square Shops, NPCs, and side paths around the coastal village.
- Mortuga Submarine Deck-by-deck breakdown of the submarine where the murder unfolds.
Characters & Suspects
Profiles for Detective Grimoire, allies, and every crew member with motive to kill aboard the Mortuga.
- Detective Grimoire The returning sleuth from the Detective Grimoire series leading this investigation.
- Sally Spears Grimoire's sharp-witted partner who keeps the case file organized under pressure.
- Magnus Mortuga Owner of the submarine and a central figure in the Mortuga family legacy.
- Captain Seafoam Commanding officer of the Mortuga with secrets tied to the voyage.
- All Suspects Full roster of crew and guests, each with alibis, motives, and interview notes.
Achievements & Tracking
Track Steam and console achievements plus use wiki tools to log evidence and suspicion as you play.
Critical Reception
Read our spoiler-free review of SFB Games' latest detective adventure and how it compares to earlier Grimoire titles.
The Mermaid Mask ReviewVerdict on story, puzzles, presentation, and whether newcomers can jump in at the Mortuga case.
Essential Guides
How to Play
Core loop: explore scenes, inspect objects, and advance the narrative case board.
Read guideComplete Puzzles
General strategies for logic locks, dial puzzles, and when to revisit earlier areas.
Read guideInspect 3D Clues
Rotate and zoom evidence in 3D to find scratches, labels, and hidden markings.
Read guideInvestigate Suspects
Techniques for catching lies, presenting evidence, and unlocking new dialogue branches.
Read guideUse Hint System
How Grimoire's tiered hints work and when to spend them for the best experience.
Read guideLatest Updates
- •July 18, 2026 — [[/news/grimoire-series-future/|Adam Vian interview]] confirms Detective Grimoire hiatus after launch; [[/walkthrough/childs-room/|Child's Room walkthrough]] added.
- •July 18, 2026 — Launch week coverage: [[/news/july-2026-launch/|July 16 release recap]], [[/guides/platforms-and-release/|platforms guide]], and [[/walkthrough/illusion-theatre/|Illusion Theatre walkthrough]].
- •Gamereactor, Shacknews, and Game Informer day-one reviews aggregated on [[/review/|review roundup]] — strongest Grimoire scores to date.
- •Official SFB Games release trailer and Shacknews showcase videos embedded on news and guide pages.
- •Interactive evidence checklist and suspicion tracker tools updated for 21 launch achievements.
Frequently Asked Questions
What is The Mermaid Mask?
The Mermaid Mask is a point-and-click detective mystery developed by SFB Games, released on July 16, 2026. It follows Detective Grimoire and Sally Spears as they investigate a murder aboard the Mortuga Submarine. See our [[/review/|review]] for a spoiler-free overview.
Do I need to play earlier Detective Grimoire games first?
No. The Mermaid Mask is a standalone case in the Detective Grimoire series. Familiar characters return, but the Mortuga plot is self-contained. Start with the [[/walkthrough/prologue/|prologue walkthrough]] if you are new.
How long does The Mermaid Mask take to complete?
Most players finish in 6–10 hours, depending on puzzle difficulty and how thoroughly you inspect scenes. Use the [[/tools/evidence-checklist/|evidence checklist]] if you want a thorough first playthrough without backtracking.
Where can I find puzzle solutions without full spoilers?
Each puzzle page offers progressive hints before the final solution. Browse [[/puzzles/mess-hall-dials/|puzzle solutions]] individually, or read [[/guides/how-to-complete-puzzles/|how to complete puzzles]] for general strategies that apply across the submarine.
What platforms is The Mermaid Mask available on?
The game launched on PC, Mac, PlayStation, and Nintendo Switch in July 2026. Control layouts for every platform are listed on the [[/controls/|controls overview]] page.
How does the hint system work?
Detective Grimoire offers layered hints that escalate from nudges to direct guidance. The [[/guides/how-to-use-hint-system/|hint system guide]] explains when hints unlock and how to avoid over-relying on them during your first investigation.
Is this wiki official?
No. The Mermaid Mask Wiki is an unofficial fan project and is not affiliated with SFB Games. We aim for accuracy and cite in-game evidence, but always verify critical details in your own save file.
How do I track suspects and evidence while playing?
Use our browser-based [[/tools/suspicion-tracker/|suspicion tracker]] to note alibis and contradictions, and the [[/tools/evidence-checklist/|evidence checklist]] to confirm you have every clue before the final accusation. Progress saves locally in your browser.
Where is the Mortuga Submarine on the map?
The submarine is the primary crime scene after the Stonetop Inn prologue. The [[/map/mortuga-submarine/|Mortuga Submarine map]] labels every deck, while the [[/map/|map overview]] shows how Stonetop connects to the voyage.
Are there achievements and how do I get them all?
Yes. The game includes story, exploration, and puzzle-related achievements on Steam and consoles. See the full [[/achievements/|achievements list]] for unlock conditions, including missable entries tied to specific interview choices.