Last updated: July 2026
Shape Matching Lock Puzzle Solution
Open the Dream Chamber corridor safe in The Mermaid Mask by matching four nearly identical shape pieces. Placement order and orientation guide.
The corridor safe outside the Dream Chamber demands precise placement of four shape pieces that appear maddeningly similar at first glance. Shape matching lock design is a SFB Games specialty: each piece shares outline family but differs in micro-bevels visible only under direct lamp light or 3D rotation. Securing Dream Chamber access unlocks surreal sequence spaces tied to Mortuga's family tragedy and provides items needed for piggy bank numbers completion.
Acquiring the Four Pieces
Pieces drop from three sources: pentagon token from card lens puzzle, circle spacer from Illusion Theatre prop crate (post key retrieval), square wafer from Engine Room toolbox, and triangle shard from town square antique shop optional buy. Arrange inventory pieces on the safe face plate; incorrect slots reject with soft clack audio. Spears notes "look for the tell-tale chamfer" when holding piece under desk lamp in Child's Room.
Correct Placement Pattern
Orient pieces relative to safe compass rose engraved at top: triangle top-left with chamfer facing center, square top-right flat edge outward, pentagon bottom-left anchor mark down, circle bottom-right notch aligned to rose stem. When all four seat, Dream Chamber door hisses open releasing equalized air and tail segment location for pig puzzle. Keyhole icon confirms; map updates Dream Chamber icon on Mortuga map.
Inside Dream Chamber, explore slowly—environmental audio carries clues for Mariana Moon interviews without jump scares. This room contains no combat or fail states, honoring the series' cozy mystery tone praised in reviews. Return to safe anytime; pieces remain set permanently after first solve.
- Collect triangle, square, pentagon, circle pieces from Parlor, Theatre, Engine, town square.
- Use Child's Room lamp to identify chamfered edges via 3D inspect.
- Place triangle TL, square TR, pentagon BL, circle BR relative to compass rose.
- Enter Dream Chamber; retrieve pig tail and Moon-related audio logs.