LEGO 11204 Mermaid Gabby's Aquarium Adventure: Set Guide

Specifications

Set number	11204
Release year	2025
Piece count	114
Minifigures	3
Theme	Gabby's Dollhouse
Building instructions	Download the instructions on lego.com

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Set 11204, Mermaid Gabby's Aquarium Adventure, depicts an aquatic adventure scene with Gabby as a mermaid in the Gabby's Dollhouse theme. Released in 2025, it contains 114 pieces and presents the series setting through a compact aquarium-style build.

Mermaid Gabby's Aquarium Adventure is part of the Gabby's Dollhouse theme and focuses on an underwater version of Gabby's world. The model is built around an aquarium scene, combining Gabby's mermaid form with characters that fit the feline and marine tone of the licensed series.

The build is best understood as a small play setting for character scenes rather than a large display structure.

The set suits collectors of Gabby's Dollhouse as well as builders looking for a self-contained scene centered on Mermaid Gabby. For display, it can serve as a compact themed vignette. Alongside other sets from the same theme, it adds a marine setting that contrasts with more general dollhouse environments.

Inventory of set 11204

The inventory of set 11204 lists 114 pieces, spare parts excluded: 68 different lots (one shape in one color) for 64 part shapes.

Colors of set 11204

Main color: tan, making up 18% of the parts, followed by medium azure (17%) and vibrant yellow (11%).

Color	Parts	Share
Tan	21	18%
Medium Azure	19	17%
Vibrant Yellow	12	11%
Blue	10	8.8%
Light Aqua	8	7%
Trans-Light Blue	7	6.1%
Dark Pink	6	5.3%
Dark Azure	5	4.4%
Lime	3	2.6%
Medium Lavender	3	2.6%
Other colors (12)	20	18%

Part types

Type	Parts	Share
Bricks Curved	19	17%
Animals / Creatures	14	12%
Plates	11	9.6%
Bricks	9	7.9%
Bricks Round and Cones	9	7.9%
Plates Special	8	7%

Most common parts in set 11204

Part	Color	Quantity
Brick Arch 1 x 3 x 3 [Gothic] 13965	Tan	4
Brick Arch 1 x 3 x 3 [Gothic] 13965	Medium Azure	4
Brick 1 x 1 3005	Medium Azure	4
Tile 1 x 2 with Groove 3069b	Dark Azure	4
Brick Round 2 x 2 Dome Top, Hollow Stud 30367c	Trans-Light Blue	3
Plant, Plate 1 x 1 Round with 3 Leaves 32607	Lime	3
Plate Special 1 x 2, Top Clip [Open O] 44861	Blue	3
Brick Sloped 45° 2 x 1 Triple with Inside Stud Holder 15571	Blue	2
Brick Arch 1 x 8 x 2 Raised 16577	Tan	2
Brick Curved 1 x 3 x 2 Inverted [Inside Bow] 18653	Medium Azure	2

47 of the 64 part shapes in this set have their own page on Setopedia, with their colors, element numbers and the other sets that use them. See all LEGO parts

Exclusive parts in set 11204

6 part shapes in set 11204 appear in no other set in the catalog, most often printed elements, stickers or molds specific to the model. If one gets lost, you will need to look for it individually, for example on BrickLink, rather than in another set. Counting colors, 7 lots in the set are not found in any other set.

Part	Color
Minidoll Head Reddish Brown Eyebrows, Dark Brown Eyes, Sand Green Freckles 92198pr0084	Nougat
Brick Round 2 x 2 Dome Top with 2 Ears with Cat Face, Bright Pink Nose, Black Eyes, Pink Dots print 5690pr0001	Reddish Orange
Minidoll Torso Boy with Nougat Arms and Hands with Dark Pink Dress, Metal Pink/Metal Blue Dots print 11408c05pr0011	Nougat
Minidoll Hips and Fishtail (Mermaid) with Metal Blue/Metal Pink Dots, Opal Trans-Dark Blue Fin print 16530c01pr0006	Dark Pink
Panel 1 x 6 x 5 with Under Sea, Coral Coral, Seahorse, Lime Squid, Rocks, Bubbles print 59349pr0034	Trans-Light Blue
Headwear Accessory Cat Ears with Pin, Dark Pink Ears, Dark Turquoise Spot print 4039pr0002	Bright Pink

No similarly sized set supplies more than a quarter of its parts: set 11204 relies on a little-shared assortment.

Size of set 11204 within its line

With 114 pieces, set 11204 ranks #8 out of 12 Gabby's Dollhouse sets in our database, which have an average of 184 parts. Among the 625 sets released in 2025, it ranks #493.

Included minifigures

MerCatQuantity : 1
Gabby, Mermaid TailQuantity : 1
Kitty JellyfishQuantity : 1

Frequently asked questions

How many pieces does LEGO set 11204 Mermaid Gabby's Aquarium Adventure have?

LEGO set 11204 Mermaid Gabby's Aquarium Adventure has 114 pieces. It was released in 2025 as part of the Gabby's Dollhouse theme.

What year was LEGO set 11204 released?

Set 11204 Mermaid Gabby's Aquarium Adventure was released in 2025 and belongs to the Gabby's Dollhouse theme.

Which minifigures are included in set 11204?

Number of minifigures in LEGO set 11204 Mermaid Gabby's Aquarium Adventure: 3. Their names and quantities are listed in the “Included minifigures” section.

Where can I find the building instructions for set 11204?

The instructions for LEGO set 11204 Mermaid Gabby's Aquarium Adventure can be downloaded free as a PDF from the official lego.com website, under “Building Instructions”, by entering the number 11204.

What is the main color of LEGO set 11204?

Tan, with 21 out of 114 pieces, or 18%. Next come medium azure (17%) and vibrant yellow (11%).

How many different parts does set 11204 contain?

Set 11204 has 68 different lots (one shape in one color), covering 64 part shapes. Most common part: Brick Arch 1 x 3 x 3 [Gothic] in tan, with 4 copies.

Does LEGO set 11204 contain any exclusive parts?

Yes: 6 part shapes exist in no other set, for example: Minidoll Head Reddish Brown Eyebrows, Dark Brown Eyes, Sand Green Freckles.