LEGO 45521 Computer Science & AI Kit 3-5: Set Guide

Specifications

Set number	45521
Release year	2026
Piece count	321
Minifigures	4
Theme	Educational and Dacta
Building instructions	Download the instructions on lego.com

Where to buy set 45521

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Set 45521, Computer Science & AI Kit 3-5, belongs to the Educational and Dacta theme and is identified as a kit about computer science and artificial intelligence. Listed for 2026, it contains 321 pieces and 4 monochrome minifigures.

Set 45521, Computer Science & AI Kit 3-5, sits in Educational and Dacta, a theme associated with educational LEGO materials.

The listed figures are Monochrome Bright Green, Monochrome Red, 28621 Head, Monochrome Blue, and Monochrome Bright Light Orange, 28621 Head.

This set is most relevant for classroom use, guided building activities, or collections focused on Educational and Dacta releases. Compared with playsets built around scenes or characters, it is positioned around a subject area and a teaching context. For collectors, the monochrome minifigure selection and the educational theme placement are the clearest identifying points.

Inventory of set 45521

The inventory of set 45521 lists 321 pieces, spare parts excluded: 97 different lots (one shape in one color) for 83 part shapes.

Colors of set 45521

Main color: white, making up 21% of the parts, followed by black (14%) and dark purple (11%).

Color	Parts	Share
White	67	21%
Black	46	14%
Dark Purple	35	11%
Dark Turquoise	34	11%
Coral	28	8.7%
Trans-Purple	22	6.9%
Light Bluish Gray	18	5.6%
Yellow	18	5.6%
Red	13	4%
Trans-Clear	10	3.1%
Other colors (8)	29	9%

Part types

Type	Parts	Share
Bricks	48	15%
Plates Special	38	12%
Plates Round Curved and Dishes	22	6.9%
Bricks Sloped	22	6.9%
Technic Bricks	22	6.9%
Bricks Special	18	5.6%

Most common parts in set 45521

Part	Color	Quantity
Tile Round 2 x 2 with Black Circle, White Circles / Eye print 14769pr9967	White	12
Technic Pin without Friction Ridges Lengthwise 3673	Yellow	12
Cone 1 x 1 [Top Groove] 59900	Trans-Purple	8
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] 2654	Light Bluish Gray	6
Brick Sloped 45° 2 x 1 with Bottom Pin 3040b	Trans-Purple	6
Bracket 1 x 2 - 2 x 2 44728	Dark Purple	6
Technic Axle 3 4519	Yellow	6
Plate Special 2 x 2 x 2/3 with Axle Hole and Grill on Sides (Haybale) 71752	Light Bluish Gray	6
Plate Special 2 x 2 with Rubber Foot 109373	Black	4
Technic Brick 2 x 4 with 4 Pin Holes, 2 Pins 112174	White	4

61 of the 83 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

No part in set 45521 is exclusive: each one is found in at least one other set, which makes replacing a lost element easier.

Rebuilding set 45521 from another set

Share of the parts of set 45521 found in each of these similarly sized sets, counting shape, colour and quantity:

Set	Found	Parts	Release year
45546 Computer Science & AI 3-5 Replacement Pack	65%	224	2026
45522 Computer Science & AI Kit 6-8	54%	379	2026
45547 Computer Science & AI 6-8 Replacement Pack	45%	244	2026
45520 Computer Science & AI Kit K-2	25%	276	2026

Set 45546 Computer Science & AI 3-5 Replacement Pack supplies 65% of them: enough to build a good part of the model before filling in the rest piece by piece.

Size of set 45521 within its line

With 321 pieces, set 45521 ranks #94 out of 480 Educational and Dacta sets in our database, which have an average of 281 parts. Among the 558 sets released in 2026, it ranks #303.

Included minifigures

Monochrome Bright GreenQuantity : 1
Monochrome Red, 28621 HeadQuantity : 1
Monochrome BlueQuantity : 1
Monochrome Bright Light Orange, 28621 HeadQuantity : 1

Frequently asked questions

How many pieces does LEGO set 45521 Computer Science & AI Kit 3-5 have?

LEGO set 45521 Computer Science & AI Kit 3-5 has 321 pieces. It was released in 2026 as part of the Educational and Dacta theme.

What year was LEGO set 45521 released?

Set 45521 Computer Science & AI Kit 3-5 was released in 2026 and belongs to the Educational and Dacta theme.

Which minifigures are included in set 45521?

Number of minifigures in LEGO set 45521 Computer Science & AI Kit 3-5: 4. Their names and quantities are listed in the “Included minifigures” section.

Where can I find the building instructions for set 45521?

The instructions for LEGO set 45521 Computer Science & AI Kit 3-5 can be downloaded free as a PDF from the official lego.com website, under “Building Instructions”, by entering the number 45521.

What is the main color of LEGO set 45521?

White, with 67 out of 321 pieces, or 21%. Next come black (14%) and dark purple (11%).

How many different parts does set 45521 contain?

Set 45521 has 97 different lots (one shape in one color), covering 83 part shapes. Most common part: Tile Round 2 x 2 with Black Circle, White Circles / Eye print in white, with 12 copies.

Does LEGO set 45521 contain any exclusive parts?

No: every one of its parts is found in at least one other set.

Which similarly sized set contains the most parts from set 45521?

Set 45546 Computer Science & AI 3-5 Replacement Pack, released in 2026: it supplies 65%, counting shapes, colors and quantities.

Which minifigures are listed for this set?

The listed minifigures are Monochrome Bright Green, Monochrome Red, 28621 Head, Monochrome Blue, and Monochrome Bright Light Orange, 28621 Head.