Roar into Adventure!
Build Your Own Mighty Dinosaurs

Unleash your inner paleontologist with this 3-in-1 Creator set! Construct a posable T-Rex, Triceratops, or Pterodactyl from 174 pieces.

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🏛 Creator 3-in-1
Set #77940

Mighty Dinosaurs - Brown Version

The Mighty Dinosaurs set is a surprisingly cool little build.

🏆 Best For: Younger LEGO fans and dinosaur enthusiasts aged 7+ ⏱ 1.5 hr build 🧩 174 pcs 🎂 Ages 7+
★★★★☆ 4.2

Fans appreciate the set's clever design and posability for the price point. The 3-in-1 build offers great play value, although some find the T-Rex design slightly less appealing than the alternate builds.

MSRP
$14.99
Best Price
$78.21
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📝 Our Take

The Mighty Dinosaurs set is a surprisingly cool little build. This 3-in-1 Creator set packs a lot of prehistoric fun into a small package, letting you build a T-Rex, Triceratops, or Pterodactyl from the same bricks. It's a great way to spark imagination and learn about dinosaurs.

This set is perfect for younger LEGO fans and dinosaur enthusiasts. The build is straightforward and engaging, making it a great entry point into the world of LEGO Creator sets. The posable features add to the playability, allowing for dynamic displays and storytelling.

Skip this if you're looking for a challenging or complex build. This set is designed for a younger audience, so experienced builders might find it too simple. Consider the larger LEGO Dinosaur Fossils set 21320-1 for a more intricate experience.

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🧱 Building Experience

🧩
174
Pieces
1.5h
Build Time
📊
Beginner
Difficulty
👤
{"min"=>7}
Ages
Build Highlights:
  • Simple and engaging build process
  • Posable joints for dynamic displays
  • 3-in-1 design offers multiple building options
  • Uses basic but effective building techniques for a solid model

📈 Investment Analysis

↑ Trending up since release
B
Investment Grade
⏳ Appreciating
The Mighty Dinosaurs set has seen a significant price increase since retirement, making it a potentially interesting investment. Its appeal lies in the enduring popularity of dinosaurs and the collectibility of 3-in-1 Creator sets. The low piece count might limit upside, but the rising price trend indicates strong demand. As a retired set, its value will likely continue to appreciate, but monitor market trends for potential fluctuations.

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

📖 About This Set

Kids can travel back in time to when dinosaurs roamed the earth with this LEGO® Creator 3in1 Mighty Dinosaurs (77940) playset. It features an impressive brick-built T-Rex toy with posable legs, arms, head and jaw, plus a ribcage to add another dimension to kids’ fun stories.

LEGO® toys kickstart imaginative play
The prehistoric action never stops with 3 dinosaur toys for kids to build and play with in this LEGO Creator 3in1 set. They can construct a posable T-Rex, rebuild it into a scary triceratops with 3 horns, transform it into a pterodactyl with long wings, or use the 174 bricks to create their own terrifying dinosaur.

Creative gifts for nonstop action
LEGO Creator 3in1 playsets guarantee nonstop fun with 3 different detailed models for kids to build in every set! Each model can be taken apart and rebuilt into whatever most excites their imaginations. Choose from an amazing range of 3in1 LEGO toy sets including castles, space rockets and amusement parks.

  • This LEGO® Creator 3in1 Mighty Dinosaurs (77940) playset will inspire kids’ sense of adventure with 3 models in 1 – a T-Rex, triceratops and pterodactyl.
  • The 3 dinosaur toys are all highly posable: The T-Rex can move its legs, arms, head and jaw, the triceratops can move its head and tail, while the pterodactyl can flap its impressive wings.
  • This 174-piece toy playset makes a great gift for LEGO® fans aged 7 and up to first enjoy a fun building experience before playtime begins.
  • Standing  4 in. (11 cm) tall – the T-Rex toy is a great size for kids to play with at home or take with them wherever they go.
  • Passionate dinosaur fans will be spoilt for choice with 3 different detailed models to build; a T-Rex, triceratops and pterodactyl.
  • Look out for other great new-for-2021 LEGO® Creator 3in1 playsets: Space Shuttle Adventure (31117), Ferris Wheel (31119) and Medieval Castle (31120).
  • LEGO® Creator 3in1 sets provide amazing fun and value as kids can build and create 3 different models in every box.
  • For more than 60 years LEGO® building bricks have been made from high-quality materials to ensure they consistently connect and pull apart every time.
  • LEGO® building bricks meet stringent global safety standards.

Compare Similar Sets

Compared to other dinosaur-themed LEGO sets, the Mighty Dinosaurs offers a more affordable and accessible option. While it lacks the detail and scale of sets like the Jurassic Park T. rex Breakout 76956-1, it provides a fun and engaging building experience for younger fans. It's a good alternative for those who want a dinosaur-themed LEGO set without a large investment.

📦 Full Parts Inventory - 61 unique parts • 174 total pieces

Bar Holder with Clip Bar Holder with Clip
Part #: 11090 White
Slope Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges] Slope Curved 4 x ...
Part #: 11153 Dark Orange
Plate Special 1 x 2 with Pin Hole on Top Plate Special 1 x...
Part #: 11458 Reddish Brown
Plate Special 1 x 2 with Clip Horizontal on Side Plate Special 1 x...
Part #: 11476 Light Bluish Gray
Slope Curved 2 x 1 No Studs [1/2 Bow] Slope Curved 2 x ...
Part #: 11477 Dark Tan
Slope Curved 2 x 1 No Studs [1/2 Bow] Slope Curved 2 x ...
Part #: 11477 Dark Orange
Plate Special 1 x 2 with 5.9mm Centre Side Towball Plate Special 1 x...
Part #: 14417 Dark Bluish Gray
Plate Special 1 x 2 5.9mm Towball Socket Plate Special 1 x...
Part #: 14418 Light Bluish Gray
Plate Special 1 x 2 5.9mm Centre Side Towball Socket Plate Special 1 x...
Part #: 14704 Light Bluish Gray
Slope Curved 2 x 2 x 2/3 Slope Curved 2 x ...
Part #: 15068 Dark Orange
Plate Special 1 x 2 with Three Teeth [Tri-Tooth] Plate Special 1 x...
Part #: 15208 White
Tile Special 1 x 1 with Clip with Rounded Edges Tile Special 1 x ...
Part #: 15712 Reddish Brown
Technic Brick Special 2 x 2 with 10.2mm Balls with Holes and Axle Hole Technic Brick Spe...
Part #: 17114 Dark Bluish Gray
Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side Brick Special 1 x...
Part #: 22885 Light Bluish Gray
Tile 1 x 4 with Groove Tile 1 x 4 with G...
Part #: 2431 Bright Pink
Tile 1 x 4 with Groove Tile 1 x 4 with G...
Part #: 2431 Dark Tan
Brick Special 1 x 1 with Studs on 2 Adjacent Sides Brick Special 1 x...
Part #: 26604 Tan
Brick 2 x 4 Brick 2 x 4
Part #: 3001 Dark Tan
Brick 2 x 2 Brick 2 x 2
Part #: 3003 Dark Orange
Brick 1 x 2 Brick 1 x 2
Part #: 3004 Dark Orange
Brick 1 x 4 Brick 1 x 4
Part #: 3010 Reddish Brown
Plate 2 x 4 Plate 2 x 4
Part #: 3020 Dark Tan
Plate 2 x 4 Plate 2 x 4
Part #: 3020 Dark Orange
Plate 2 x 3 Plate 2 x 3
Part #: 3021 Dark Tan
Plate 2 x 2 Plate 2 x 2
Part #: 3022 Dark Orange
Plate 1 x 2 Plate 1 x 2
Part #: 3023 Bright Pink
Plate 1 x 2 Plate 1 x 2
Part #: 3023 Dark Orange
Plate 1 x 2 Plate 1 x 2
Part #: 3023 Reddish Brown
Plate 1 x 1 Plate 1 x 1
Part #: 3024 Dark Orange
Plate Round Corner 3 x 3 Plate Round Corne...
Part #: 30357 Dark Orange
Bar 4L (Lightsaber Blade / Wand) Bar 4L (Lightsabe...
Part #: 30374 White
Hinge Plate 1 x 2 Locking with 1 Finger On Top Hinge Plate 1 x 2...
Part #: 30383 Dark Bluish Gray
Slope 45° 2 x 1 with Bottom Pin Slope 45° 2 x 1 w...
Part #: 3040b Dark Orange
Brick Round 1 x 1 Open Stud Brick Round 1 x 1...
Part #: 3062b Black
Technic Axle 2 Notched Technic Axle 2 No...
Part #: 32062 Red
Slope Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Slope Inverted 45...
Part #: 3660 Dark Orange
Slope Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Slope Inverted 45...
Part #: 3660 Dark Tan
Plate 1 x 4 Plate 1 x 4
Part #: 3710 Dark Tan
Slope Inverted 33° 3 x 2 [Connections between Studs] Slope Inverted 33...
Part #: 3747b Dark Tan
Plate 2 x 6 Plate 2 x 6
Part #: 3795 Dark Tan
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Plate Round 2 x 2...
Part #: 4032a Reddish Brown
Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End Section Animal Body Part ...
Part #: 40379 White
Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Plate Special 1 x...
Part #: 4081b Black
Wedge Plate 4 x 2 Right Wedge Plate 4 x 2...
Part #: 41769 Dark Orange
Wedge Plate 4 x 2 Left Wedge Plate 4 x 2...
Part #: 41770 Dark Orange
Technic Pin 1/2 Technic Pin 1/2
Part #: 4274 Light Bluish Gray
Wedge Curved 6 x 4 Triple Wedge Curved 6 x ...
Part #: 43712 Dark Orange
Wedge Plate 3 x 2 Right Wedge Plate 3 x 2...
Part #: 43722 Reddish Brown
Wedge Plate 3 x 2 Left Wedge Plate 3 x 2...
Part #: 43723 Reddish Brown
Wheel Arch, Curved Wedge 4 x 3 with 2 x 2 Opening and 4 Studs Wheel Arch, Curve...
Part #: 47755 Reddish Brown
Brick Special 1 x 2 with Studs on 2 Sides Brick Special 1 x...
Part #: 52107 Dark Tan
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Animal Body Part,...
Part #: 53451 Black
Technic Ball Joint with Through Axle Hole Technic Ball Join...
Part #: 53585 Black
Slope 30° 1 x 1 x 2/3 (Cheese Slope) Slope 30° 1 x 1 x...
Part #: 54200 Dark Orange
Hinge Plate 1 x 2 Locking with 2 Fingers On End, without Groove, 7 Teeth Hinge Plate 1 x 2...
Part #: 54657 Dark Bluish Gray
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye Light Cover 1 x 1...
Part #: 58176 Trans-Bright Green
Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Plate Special 1 x...
Part #: 60470b Black
Plate Special 1 x 2 with Handle on End [Closed Ends] Plate Special 1 x...
Part #: 60478 Reddish Brown
Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Plate Special 1 x...
Part #: 60897 Tan
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 Trans-Bright Green
Plate Special 1 x 2 with Clip Horizontal on End Plate Special 1 x...
Part #: 63868 Black
Large Figure Skeletal, Joint Extender [High Friction] Large Figure Skel...
Part #: 74261 Dark Bluish Gray
Technic Brick 1 x 2 with Hole and Dual Beam Extensions Technic Brick 1 x...
Part #: 85943 Dark Bluish Gray
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Medium Animal Body Part,...
Part #: 87747 Black
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Medium Animal Body Part,...
Part #: 87747 White
Bar 3L Bar 3L
Part #: 87994 Black
Technic Brick Special 2 x 2 with Ball Socket Wide and Axle Hole Technic Brick Spe...
Part #: 92013 Dark Brown
Pneumatic Hose Connector with Axle Connector Pneumatic Hose Co...
Part #: 99021 Dark Bluish Gray
This set features a good selection of Dark Orange and Reddish Brown elements, useful for building organic shapes and natural landscapes. The inclusion of multiple White Plate Special 1 x 2 with Three Teeth is great for adding texture and detail.

🛒 Where to Buy

💎 Notable Parts

White Plate Special 1 x 2 with Three Teeth [Tri-Tooth] (7x) $1.75
Dark Orange Slope Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges] (6x) $0.90
Reddish Brown Plate 1 x 2 (8x) $0.40
Dark Brown Technic Brick Special 2 x 2 with Ball Socket Wide and Axle Hole (4x) $0.80
Black Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Medium (6x) $1.50
Est. BrickLink Part Value
$5.35

💡 MOC Potential

🌳 Dinosaur fossil display
🤖 Dinosaur-themed mech
🚗 Off-road vehicle with dinosaur styling

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

Based on 7 videos
3.3 /5
Mixed
14% positive
BlockTalk AI

The LEGO Mighty Dinosaurs set (particularly versions 31058, 77940, and 77941) receives mixed to neutral sentiment overall. While some appreciate it as a great value with enjoyable builds, there aren't strong widespread opinions expressed in the analyzed reviews.

Community Sentiment

Based on 7 YouTube reviews

Reddit

Not enough Reddit data

YouTube

3.3 /5
Mixed
14% positive
1
Positive
6
Mixed
0
Critical
Common Feedback
+ Great, Love, Value
BlockTalk AI Analysis

The LEGO Mighty Dinosaurs set (particularly versions 31058, 77940, and 77941) receives mixed to neutral sentiment overall. While some appreciate it as a great value with enjoyable builds, there aren't strong widespread opinions expressed in the analyzed reviews.

What the Community Says

2 YouTube reviews
BlockTalk AI Summary

Big Will Bricks reviews the 3in1 T-Rex, framing it as a successor to the Mighty Dinosaur. MjekuMati after work highlights the set's value and the enjoyment his kids get from it, while also acknowledging potential downsides.

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

Charts Inventory Statistics

61
Unique Parts
174
Total Pieces
0
Minifigures
Inventory Version: 1