LEGO Set 21356 River Steamboat: Pieces, Year, Figures

Specifications

Set number	21356
Release year	2025
Piece count	4,090
Minifigures	0
Theme	LEGO Ideas and CUUSOO
Building instructions	Download the instructions on lego.com

Where to buy set 21356

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LEGO Ideas 21356, River Steamboat, depicts a river steamboat within the LEGO Ideas and CUUSOO theme. Released in 2025, the set contains 4090 pieces and presents a fan rooted subject as a substantial ship model.

River Steamboat brings a river steamboat subject to LEGO Ideas and CUUSOO.

River Steamboat is likely to appeal to builders who collect LEGO Ideas and CUUSOO sets, especially those interested in ships, transport subjects and display models. Within the theme, it sits among object based fan designs rather than character led releases, giving it a distinct place in the range.

Inventory of set 21356

The inventory of set 21356 lists 4,090 pieces, spare parts excluded: 640 different lots (one shape in one color) for 343 part shapes. The box also contains 99 spare parts, for small elements that are easy to lose.

Colors of set 21356

Main color: white, making up 28% of the parts, followed by black (15%) and reddish brown (13%).

Color	Parts	Share
White	1,155	28%
Black	606	15%
Reddish Brown	544	13%
Tan	386	9.4%
Dark Tan	357	8.7%
Light Bluish Gray	343	8.4%
Red	162	4%
Dark Bluish Gray	104	2.5%
Dark Brown	91	2.2%
Dark Blue	79	1.9%
Other colors (17)	262	6.4%

Part types

Type	Parts	Share
Plates	653	16%
Tiles	642	16%
Bricks	435	11%
Plates Special	302	7.4%
Bricks Special	230	5.6%
Minifig Accessories	228	5.6%

Most common parts in set 21356

Part	Color	Quantity
Equipment Telescope / Torch / Spyglass, Support Round 1 x 1 x 1 2/3 64644	White	176
Tile 1 x 6 with Groove 6636	Reddish Brown	110
Plate 1 x 2 3023	White	81
Technic Axle 2 Notched 32062	Black	62
Tile 1 x 2 with Groove 3069b	Reddish Brown	55
Brick Special 1 x 2 Palisade [aka Log] 30136	Dark Tan	49
Brick 1 x 6 3009	Tan	45
Brick 1 x 4 3010	Dark Tan	45
Technic Pin with Friction Ridges Lengthwise with No Center Slots 61332	Black	45
Glass for Window 1 x 2 x 2 Flat 60601	Trans-Clear	42

331 of the 343 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 21356

3 part shapes in set 21356 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, 6 lots in the set are not found in any other set.

Part	Color
Tile 2 x 6 with White 'AMELIA', Border print 69729pr0047	Reddish Brown
Sticker Sheet for Set 21356-1 10113534
String Cord Medium Thickness (1mm) 175cm 37597c175	Dark Bluish Gray

Rebuilding set 21356 from another set

Share of the parts of set 21356 found in each of these similarly sized sets, counting shape, colour and quantity:

Set	Found	Parts	Release year
11377 The Lord of the Rings: Minas Tirith	30%	8,278	2026

No similarly sized set goes above 30%: the model relies on a little-shared assortment, most of which has to be gathered piece by piece.

Size of set 21356 within its line

With 4,090 pieces, it is the largest of the 94 LEGO Ideas and CUUSOO sets in our database, which have an average of 1,279 parts. Among the 625 sets released in 2025, it ranks #3. That is 3.2 times the average LEGO Ideas and CUUSOO set size.

Frequently asked questions

How many pieces does LEGO set 21356 River Steamboat have?

LEGO set 21356 River Steamboat has 4,090 pieces. It was released in 2025 as part of the LEGO Ideas and CUUSOO theme.

What year was LEGO set 21356 released?

Set 21356 River Steamboat was released in 2025 and belongs to the LEGO Ideas and CUUSOO theme.

Which minifigures are included in set 21356?

LEGO set 21356 River Steamboat does not include any minifigures.

Where can I find the building instructions for set 21356?

The instructions for LEGO set 21356 River Steamboat can be downloaded free as a PDF from the official lego.com website, under “Building Instructions”, by entering the number 21356.

What is the main color of LEGO set 21356?

White, with 1,155 out of 4,090 pieces, or 28%. Next come black (15%) and reddish brown (13%).

How many different parts does set 21356 contain?

Set 21356 has 640 different lots (one shape in one color), covering 343 part shapes. Most common part: Equipment Telescope / Torch / Spyglass, Support Round 1 x 1 x 1 2/3 in white, with 176 copies.

Does LEGO set 21356 contain any exclusive parts?

Yes: 3 part shapes exist in no other set, for example: Tile 2 x 6 with White 'AMELIA', Border print.

Which similarly sized set contains the most parts from set 21356?

Set 11377 The Lord of the Rings: Minas Tirith, released in 2026: it supplies 30%, counting shapes, colors and quantities.