Knuckles & Shadow!
Gotta build 'em FAST

Assemble these iconic Sonic the Hedgehog characters in Brickheadz form. A nostalgic set with 298 pieces for gamers and collectors!

Breaking News

LEGO Retiring Soon List – October 2026 Update

The Brick Fan • about 7 hours ago
🏛 Brickheadz
Set #40672

Sonic the Hedgehog: Knuckles & Shadow

Sonic the Hedgehog: Knuckles & Shadow is a delightful double pack for fans of the speedy blue hedgehog and his rivals.

Before you buy

Who it's for
Ages 10+ · Beginner build Perfect for Sonic fans of all ages and LEGO Brickheadz collectors
Build
298 pieces · about 2 hours Build time is an estimate.
Price
$19.99 list price · 6.7¢ per piece
Availability
Retired at LEGO
★★★☆☆ 3.9 community rating from 39 ratings

Fans appreciate the accurate representation of Knuckles and Shadow in Brickheadz form, making it a must-have for Sonic collectors. Some find the build a bit repetitive but overall, it's considered a worthwhile purchase for its display value and recognizable characters.

📝 Our Take

AI-assisted editorial summary, grounded in our LEGO database and public community discussions. How we use AI

Sonic the Hedgehog: Knuckles & Shadow is a delightful double pack for fans of the speedy blue hedgehog and his rivals. This Brickheadz set perfectly captures the essence of Knuckles and Shadow with their iconic features and color schemes. It's a fun and relatively quick build that results in two charming display pieces.

This set is perfect for LEGO and Sonic enthusiasts of all ages. The build is straightforward enough for younger builders, while the recognizable characters and display value will appeal to older collectors. It's a great introduction to the Brickheadz line or a welcome addition to an existing collection.

Skip this if you're strictly looking for complex building experiences or larger-scale models. This is a smaller, character-focused set. Consider LEGO Ideas Sonic the Hedgehog – Green Hill Zone (21331) for a more involved build and larger display piece.

✨ New
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Hi! I'm BlockTalk, your LEGO expert. Ask me anything about the Sonic the Hedgehog: Knuckles & Shadow - building tips, investment potential, comparisons, or anything else!
Try asking:
How does this set compare to other Brickheadz in terms of build complexity? What are some good display options for these two characters? Is this set a good value for the price? How does this set fit into the larger Sonic the Hedgehog LEGO theme?

🧱 Building Experience

AI-assisted build estimate, grounded in our LEGO database and public community discussions. How we use AI
🧩
298
Pieces
⏱
2.0h
Estimated Build Time
📊
Beginner
Difficulty
👤
10+
Ages
Build Highlights:
  • Simple and satisfying builds for both characters
  • Clever use of slopes and plates to capture character details
  • Bright colors accurately reflect Knuckles and Shadow's appearance
  • Sturdy construction for easy display

📈 Investment Analysis

AI-assisted investment analysis, grounded in our LEGO database and public community discussions. How we use AI
↑ Trending up since release
B
Investment Grade
⏳ Retired
The Sonic the Hedgehog theme has proven popular, and this Brickheadz set offers two recognizable characters at an affordable price point. As a licensed set, it has potential for appreciation, especially if the Sonic franchise continues to thrive. Its relatively low piece count and price mean it's a lower-risk investment compared to larger, more expensive sets. However, the Brickheadz theme itself can be somewhat volatile in terms of long-term value, so temper expectations.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

⚖ Compare Similar Sets

This set offers two characters for a relatively low price compared to individual Brickheadz. While larger Sonic sets like 21331 provide a more expansive building experience, this set is a great entry point or a complementary addition for collectors. It's a good alternative for those looking for a quick and affordable Sonic-themed LEGO build.

📦 Parts Inventory

Official piece count
298
Parts cataloged in this inventory
47 unique parts, 298 pieces
Plate Special 1 x 2 with Clip Horizontal on Side Plate Special 1 x...
Part #: 11476 4× White
Plate Special 1 x 2 with Clip Horizontal on Side Plate Special 1 x...
Part #: 11476 1× Red
Brick Curved 2 x 1 No Studs [1/2 Bow] Brick Curved 2 x ...
Part #: 11477 9× Red
Brick Curved 2 x 1 No Studs [1/2 Bow] Brick Curved 2 x ...
Part #: 11477 4× Black
Brick Sloped 45° 2 x 1 Triple with Inside Stud Holder Brick Sloped 45° ...
Part #: 15571 1× Red
Brick Sloped 45° 2 x 1 Triple with Inside Stud Holder Brick Sloped 45° ...
Part #: 15571 1× Black
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Plate Special 1 x...
Part #: 15573 2× Orange
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Plate Special 1 x...
Part #: 15573 10× Red
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Plate Special 1 x...
Part #: 15573 3× Black
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Plate Special 1 x...
Part #: 15573 2× Tan
Plate Special Round 1 x 2 Half Circle with Stud (Jumper) Plate Special Rou...
Part #: 1745 4× Bright Light Orange
Brick Sloped 45° 1 x 1 x 2/3 Quadruple Convex [Pyramid] Brick Sloped 45° ...
Part #: 22388 4× White
Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side Brick Special 1 x...
Part #: 22885 28× Light Bluish Gray
Plate 2 x 2 Corner Plate 2 x 2 Corner
Part #: 2420 12× Red
Brick Curved 3 x 2 No Studs Brick Curved 3 x ...
Part #: 24309 1× Red
Tile 1 x 4 with Groove Tile 1 x 4 with G...
Part #: 2431 1× Red
Tile 1 x 4 with Groove Tile 1 x 4 with G...
Part #: 2431 2× Black
Tile 1 x 4 with Red Triangle Print Tile 1 x 4 with R...
Part #: 2431pr0204 1× Black
Tile Round 1 x 1 Quarter Tile Round 1 x 1 ...
Part #: 25269 6× Tan
Brick Wedged, Curved 2 x 1 with Stud Notch Right Brick Wedged, Cur...
Part #: 29119 5× Black
Brick Wedged, Curved 2 x 1 with Stud Notch Right Brick Wedged, Cur...
Part #: 29119 9× Red
Brick Wedged, Curved 2 x 1 with Stud Notch Left Brick Wedged, Cur...
Part #: 29120 5× Black
Brick Wedged, Curved 2 x 1 with Stud Notch Left Brick Wedged, Cur...
Part #: 29120 9× Red
Brick 2 x 2 Brick 2 x 2
Part #: 3003 2× Green
Brick 2 x 2 Brick 2 x 2
Part #: 3003 2× Bright Light Yellow
Brick 2 x 2 Brick 2 x 2
Part #: 3003 2× Bright Pink
Brick 1 x 2 Brick 1 x 2
Part #: 3004 1× Black
Brick 1 x 1 Brick 1 x 1
Part #: 3005 4× Black
Brick 1 x 1 Brick 1 x 1
Part #: 3005 2× Red
Brick 1 x 4 Brick 1 x 4
Part #: 3010 2× Red
Plate 2 x 4 Plate 2 x 4
Part #: 3020 5× Black
Plate 2 x 4 Plate 2 x 4
Part #: 3020 3× Red
Plate 2 x 3 Plate 2 x 3
Part #: 3021 3× Red
Plate 2 x 3 Plate 2 x 3
Part #: 3021 2× Light Bluish Gray
Plate 2 x 2 Plate 2 x 2
Part #: 3022 3× Red
Plate 2 x 2 Plate 2 x 2
Part #: 3022 3× Black
Plate 1 x 2 Plate 1 x 2
Part #: 3023 1× White
Plate 1 x 2 Plate 1 x 2
Part #: 3023 14× Red
Plate 1 x 2 Plate 1 x 2
Part #: 3023 2× Bright Green
Plate 1 x 2 Plate 1 x 2
Part #: 3023 12× Black
Plate 1 x 1 Plate 1 x 1
Part #: 3024 2× White
Plate 1 x 1 Plate 1 x 1
Part #: 3024 19× Red
Plate 4 x 4 Plate 4 x 4
Part #: 3031 5× Black
Plate 4 x 4 Plate 4 x 4
Part #: 3031 4× Red
Brick Sloped 45° 2 x 2 Brick Sloped 45° ...
Part #: 3039 1× Black
Brick Sloped 45° 2 x 2 Brick Sloped 45° ...
Part #: 3039 1× Red
Tile 1 x 2 with Groove Tile 1 x 2 with G...
Part #: 3069b 4× Red
Tile 1 x 2 with Groove Tile 1 x 2 with G...
Part #: 3069b 4× Black
Tile 1 x 1 with Groove Tile 1 x 1 with G...
Part #: 3070b 4× White
Tile 1 x 1 with Groove Tile 1 x 1 with G...
Part #: 3070b 10× Black
Plate Special 2 x 2 with Only 2 studs Plate Special 2 x...
Part #: 33909 2× White
Tile 45° Cut 2 x 2 (Triangle) Tile 45° Cut 2 x ...
Part #: 35787 1× White
Tile 45° Cut 2 x 2 (Triangle) Tile 45° Cut 2 x ...
Part #: 35787 2× Red
Tile 45° Cut 2 x 2 (Triangle) Tile 45° Cut 2 x ...
Part #: 35787 2× Black
Plate 1 x 3 Plate 1 x 3
Part #: 3623 2× Black
Brick Sloped Inverted 45° 2 x 1 Brick Sloped Inve...
Part #: 3665 2× Black
Bracket 1 x 1 - 1 x 1 Inverted Bracket 1 x 1 - 1...
Part #: 36840 2× Black
Plate 1 x 4 Plate 1 x 4
Part #: 3710 5× Red
Brick Round 2 x 2 with Axle Hole Brick Round 2 x 2...
Part #: 3941 2× Orange
Brick Round 2 x 2 with Axle Hole Brick Round 2 x 2...
Part #: 3941 1× Dark Turquoise
Plate 6 x 6 Plate 6 x 6
Part #: 3958 2× Black
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Plate Round 2 x 2...
Part #: 4032a 1× Green
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Plate Round 2 x 2...
Part #: 4032a 1× Yellow
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Plate Round 2 x 2...
Part #: 4032a 1× White
Plate Special 1 x 4 with 2 Studs with Groove [New Underside] Plate Special 1 x...
Part #: 41740 2× Black
Plate Special 1 x 4 with 2 Studs with Groove [New Underside] Plate Special 1 x...
Part #: 41740 2× White
Plate Special 2 x 2 x 2/3 with Two Studs On Side and Two Raised [Half Hollow Anti-stud] - Updated Version Plate Special 2 x...
Part #: 4304 1× Yellow
Bracket 1 x 2 - 2 x 2 Bracket 1 x 2 - 2...
Part #: 44728 1× White
Brick Curved 3 x 1 No Studs Brick Curved 3 x ...
Part #: 50950 4× Black
Brick Curved 3 x 1 No Studs Brick Curved 3 x ...
Part #: 50950 4× Red
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Brick Sloped 30° ...
Part #: 54200 6× Black
Plate Special 1 x 2 with Handle on End [Closed Ends] Plate Special 1 x...
Part #: 60478 1× Red
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 2× Black
Brick Sloped 30° 1 x 2 x 2/3 Brick Sloped 30° ...
Part #: 85984 1× Red
Tile 2 x 4 with Groove Tile 2 x 4 with G...
Part #: 87079 2× Black
Brick Curved 4 x 2 No Studs Brick Curved 4 x ...
Part #: 93606 1× Red
Tile Round 1 x 1 with Brickheadz Eye, White Squares, Black Circle Print Tile Round 1 x 1 ...
Part #: 98138pr0338 2× Dark Purple
Tile Round 1 x 1 with Brickheadz Eye, White Squares, Black Circle Print Tile Round 1 x 1 ...
Part #: 98138pr0338 2× Red
The set includes a good selection of red and black plates and slopes, useful for general building and MOCs. The light bluish gray brick with studs on the side is particularly useful for SNOT (Studs Not On Top) techniques.

🛒 Where to Buy

💎 Notable Parts

Light Bluish Gray Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side (28x) $4.20
Red Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) (10x) $1.50
Black Slope Curved 2 x 1 with Stud Notch Right (5x) $0.50
Black Slope Curved 2 x 1 with Stud Notch Left (5x) $0.50
Est. BrickLink Part Value
$6.70

💡 MOC Potential

🤖 Custom Sonic robot characters
🌳 Small diorama bases for each character
🚗 Rebuild parts into a small Sonic-themed vehicle

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

Based on 3 videos
3.7 /5
Positive
33% positive
BlockTalk AI

LEGO YouTubers show general positivity towards the Knuckles & Shadow BrickHeadz set (40672), with an average sentiment score of 3.7/5. The set is considered easy to assemble and is recommended for Sonic the Hedgehog fans.

Community Sentiment

Based on 3 YouTube reviews

Reddit

Not enough Reddit data

YouTube

3.7 /5
Positive
33% positive
1
Positive
2
Mixed
0
Critical
Common Feedback
+ Recommend
BlockTalk AI Analysis

LEGO YouTubers show general positivity towards the Knuckles & Shadow BrickHeadz set (40672), with an average sentiment score of 3.7/5. The set is considered easy to assemble and is recommended for Sonic the Hedgehog fans.

What the Community Says

1 YouTube reviews
BlockTalk AI Summary

Neto Lopez enjoyed the Shadow and Knuckles figures, highlighting their ease of assembly. The set is recommended for Sonic fans.

Reddit Reviews

No Reddit reviews found

Community Content: These reviews are from Reddit and YouTube users sharing their personal experiences. Opinions may vary.

📖 Building Instructions 4

Sonic the Hedgehog: Knuckles & Shadow Instructions
BI 3100, 56, 40672 1/2 V29
Download PDF
Sonic the Hedgehog: Knuckles & Shadow Instructions
BI 3100, 60, 40672 2/2 V29
Download PDF
Sonic the Hedgehog: Knuckles & Shadow Instructions
BI 3100, 56, 40672 1/2 V39
Download PDF
Sonic the Hedgehog: Knuckles & Shadow Instructions
BI 3100, 60, 40672 2/2 V39
Download PDF

Charts Inventory Statistics

47
Unique Parts
298
Official Piece Count
298
Cataloged Inventory Pieces
0
Minifigures
14
Spare Parts
Inventory Version: 1

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