The Mermaid Mask

Developer: SFB Games
Released: Jul 16, 2026
Steam reviews: 99% of players recommend it, from 2,998 reviews — Steam calls that “Overwhelmingly Positive”
Tags: AdventureCasualIndie

On Linux, Steam Deck and Steam Machine

Deck VerifiedSteam Machine: VerifiedSteamOS Compatible

Valve rates it Deck Verified. Valve rates it Verified on Steam Machine. Valve marks it SteamOS Compatible.

Deck rating: Valve · Steam Machine, Steam Frame and SteamOS ratings: Valve · Compare 2,053 games · Every game Valve rated for Steam Machine

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Where to buy

Steam

Buy on Steam

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Free demo

Steam lists a free demo for this game.

The demo on Steam ↗

What owning this involves

Cloud saves · The store backs this game's saves up. That cover ends if your account does.From the store listing

Only what the store discloses. Nothing listed here means the store disclosed nothing — not that there is nothing to disclose.

Features

Full controller support

Single-player
Steam Achievements
Full controller support
Custom Volume Controls
Mouse Only Option
#category_playable_at_your_own_pace
Playable without Timed Input
DualShock Controller Support
DualSense Controller Support
Save Anytime
Touch Only Option
Steam Cloud
Family Sharing

From the game's Steam store page.

Languages

English · full audio
French
Italian
German
Spanish - Spain
Japanese
Korean
Portuguese - Brazil
Russian
Simplified Chinese
Spanish - Latin America
Traditional Chinese

Steam lists 12 languages, 1 with full audio.

Age rating & content

DEJUS 6 · Violência fantasiosaThe rating board's own rating, as Steam relays it
IGRS 13 · KekerasanThe rating board's own rating, as Steam relays it

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About this game

The developer's description, from the game's Steam store page.

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