How many pieces are in the Welcome to the Hidden Side?

Welcome to the Hidden Side contains 189 pieces.

What age is the Welcome to the Hidden Side recommended for?

This set is recommended for ages 7+.

When was the Welcome to the Hidden Side released?

Welcome to the Hidden Side was released in 2020.

LEGO Welcome to the Hidden Side set 70427

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🏛 Hidden Side

Set #70427

Welcome to the Hidden Side

Welcome to the Hidden Side is a fantastic entry point into the innovative Hidden Side theme.

Before you buy

Who it's for: Ages 7+ · Beginner build Younger LEGO enthusiasts interested in exploring augmented reality and ghost hunting.
Build: 189 pieces · about 1 hours Build time is an estimate.
Price: $19.99 list price · 10.6¢ per piece
Availability: Retired at LEGO

★★★☆☆ 3.7 community rating from 174 ratings

Fans appreciate the set's accessibility and introduction to the Hidden Side theme, especially its AR features. Some find the build too simple and the piece count low for the price, but overall it's considered a good starting point for the theme.

$19.99

Check price on eBay

📝 Our Take

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

Welcome to the Hidden Side is a fantastic entry point into the innovative Hidden Side theme. This small set packs a punch with its interactive AR features and spooky charm, making it a great introduction to the blend of physical and digital play that defines the Hidden Side universe.

This set is perfect for kids aged 7+ and LEGO fans interested in exploring augmented reality. The build is quick and easy, making it accessible for younger builders, while the AR integration adds a unique and engaging play experience.

Skip this if you're looking for a complex building experience or a large display piece. For a more challenging build within the same theme, consider the Hidden Side Haunted High School 70425. If you're not interested in the AR features, other LEGO themes might offer better value for the piece count.

✨ New

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How does the AR integration enhance the play experience with this set? What are the key features that make this set appealing to younger builders? How does this set compare to other sets in the Hidden Side theme in terms of value and playability? What are some creative ways to display this set with other LEGO Halloween or spooky-themed sets?

🧱 Building Experience

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

🧩

189

Pieces

⏱

1.0h

Estimated Build Time

📊

Beginner

Difficulty

📏

17cm × 22cm × 13cm

Dimensions

Build Highlights:

Simple and straightforward build suitable for beginners
Introduction to the Hidden Side theme and its AR integration
Incorporates play features and hidden elements for added interactivity
Compact size makes it easy to display and play with

📈 Investment Analysis

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

Not enough price history for a trend

B-

Investment Grade

⏳ Retired

As a retired set from the Hidden Side theme, Welcome to the Hidden Side (70427-1) has moderate investment potential. The theme's unique blend of physical and digital play attracted a dedicated following, and the set's small size and relatively low price point make it an accessible entry point for collectors. However, its piece count is low, which limits its appeal to serious investors. Its value will likely appreciate slowly, driven by demand from collectors seeking to complete their Hidden Side collection.

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

⚖ Compare Similar Sets

Newbury Haunted High School

Hidden Side • 1,474 pcs

$129.99

J.B.'s Ghost Lab

Hidden Side • 174 pcs

Compared to other Hidden Side sets, Welcome to the Hidden Side is a smaller and more affordable entry point. While sets like the Haunted High School (70425-1) offer a more complex build and larger display piece, this set provides a quick and accessible way to experience the theme's AR features. It's a good choice for those new to the Hidden Side or looking for a smaller, more manageable set.

4 Minifigures Included

Jack Davids, Light Aqua Hoodie with Hood and Dark Azure Cap

4 parts

Waylon (28621 Head)

3 parts

Scrimper (28621 Head)

3 parts

B+

Axel Chops (28621 Head)

4 parts

B+

The set includes four minifigures: Jack Davids, Waylon, Scrimper, and Axel Chops. These figures add play value. The ghost hunter Jack is fun, and the ghost figures are unique.

📦 Parts Inventory

Official piece count: 189
Parts cataloged in this inventory: 80 unique parts, 175 pieces
Minifigures: 4

The official piece count includes the 14 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Missing a piece? Check this set piece by piece, with look-alike colors flagged and element IDs for replacements.

Lamp Post 2 x 2 x...

Part #: 11062 1× Black

Bar Holder with Clip

Part #: 11090 4× Black

Brick Arch 1 x 5 ...

Part #: 14395 3× Black

Panel 1 x 4 x 2 w...

Part #: 14718 2× Light Bluish Gray

Tile Round 2 x 2 ...

Part #: 14769 1× Dark Bluish Gray

Tile Round 2 x 2 ...

Part #: 14769 2× Black

Brick Curved 2 x ...

Part #: 15068 2× Light Bluish Gray

Panel 1 x 4 x 1 w...

Part #: 15207 1× Dark Bluish Gray

Plate Special 1 x...

Part #: 15208 1× Yellowish Green

Tile Special 1 x ...

Part #: 15209 2× Yellowish Green

Brick Arch 1 x 6 ...

Part #: 15254 2× Dark Bluish Gray

Plate Special 1 x...

Part #: 15573 1× Dark Bluish Gray

Wedge Plate 4 Stu...

Part #: 15706 2× Medium Azure

Tile Special 1 x ...

Part #: 15712 3× Black

Creature Body Par...

Part #: 16770 2× Black

Brick Curved 1 x ...

Part #: 18653 3× Black

Tile Special Roun...

Part #: 20482 2× Black

Tile Special 2 x ...

Part #: 22385 2× Black

Plant, Leaves 6 x 5

Part #: 2417 3× Medium Azure

Tile 1 x 4 with G...

Part #: 2431 2× Dark Bluish Gray

Tile 1 x 4 with G...

Part #: 2431 1× Medium Azure

Tile Round 1 x 1 ...

Part #: 25269 3× Black

Plate Special 2 x...

Part #: 27261 2× Black

Turntable 2 x 2 F...

Part #: 27448 1× White

Tile 2 x 2 Curved...

Part #: 27925 1× Coral

Tile 2 x 2 Curved...

Part #: 27925 1× Light Bluish Gray

Tile 2 x 2 Curved...

Part #: 27925 1× Yellow

Tile 2 x 2 Curved...

Part #: 27925 1× Medium Azure

Minifig Head [Pla...

Part #: 28621 1× Trans-Neon Green

Insect, Spider wi...

Part #: 29111 2× Black

Brick 2 x 4

Part #: 3001 2× Black

Brick 1 x 1

Part #: 3005 3× Black

Brick 1 x 6

Part #: 3009 4× Dark Bluish Gray

Plant, Sea Grass

Part #: 30093 1× Black

Brick 1 x 4

Part #: 3010 4× Light Bluish Gray

Animal, Bat

Part #: 30103 1× Black

Brick Special 1 x...

Part #: 30136 1× Dark Bluish Gray

Plate Special 2 x...

Part #: 30157 1× Dark Bluish Gray

Plate 2 x 4

Part #: 3020 2× Black

Plate 2 x 2

Part #: 3022 4× Black

Plate 2 x 2

Part #: 3022 1× Medium Azure

Plate 1 x 2

Part #: 3023 1× Dark Blue

Plate 1 x 2

Part #: 3023 3× Medium Azure

Plate 1 x 2

Part #: 3023 2× Dark Azure

Plate 4 x 6

Part #: 3032 1× Black

Plate 4 x 6

Part #: 3032 1× Medium Azure

Plate 4 x 8

Part #: 3035 1× Medium Azure

Brick Sloped 45° ...

Part #: 3039 1× Black

Brick Sloped 45° ...

Part #: 3040b 2× Black

Tile 2 x 2 with G...

Part #: 3068b 2× Yellow

Tile 1 x 2 with S...

Part #: 3069bpr0266 1× Black

Wedge Plate 4 x 6...

Part #: 32059 1× Black

Brick 1 x 2 x 2 w...

Part #: 3245c 2× Black

Plate Special 2 x...

Part #: 33909 4× Light Bluish Gray

Equipment Paint R...

Part #: 34076 1× Black

Brick 1 x 3

Part #: 3622 6× Black

Plate 1 x 3

Part #: 3623 3× Black

Plate 1 x 3

Part #: 3623 2× Light Bluish Gray

Brick Sloped Inve...

Part #: 3665 1× Black

Plate 1 x 6

Part #: 3666 2× Light Aqua

Plate 1 x 6

Part #: 3666 2× Dark Blue

Technic Brick 1 x...

Part #: 3700 2× Black

Plate 1 x 4

Part #: 3710 4× Dark Blue

Plate 2 x 6

Part #: 3795 2× Dark Bluish Gray

Plate 2 x 6

Part #: 3795 1× Medium Azure

Plate 2 x 10

Part #: 3832 1× Black

Weapon Axe

Part #: 3835 1× Black

Brick Round 2 x 2...

Part #: 3941 1× Light Bluish Gray

Plate 8 x 8 with ...

Part #: 41948 1× Medium Azure

Dish 2 x 2 Invert...

Part #: 4740 1× Black

Rock Panel 2 x 4 x 6

Part #: 47847 2× Black

Plate Special 1 x...

Part #: 48336 2× Black

Plate Special 1 x...

Part #: 49668 2× Yellowish Green

Brick Curved 3 x ...

Part #: 50950 1× Black

Animal Body Part,...

Part #: 53451 4× Black

Brick Sloped 30° ...

Part #: 54200 3× Black

Technic Axle Conn...

Part #: 57585 1× Light Bluish Gray

Cone 1 x 1 [Top G...

Part #: 59900 2× Trans-Purple

Brick Arch 1 x 3 ...

Part #: 6005 2× Black

Torso - Skeleton ...

Part #: 60115 1× Black

Plate Round 4 x 4...

Part #: 60474 1× Light Bluish Gray

Plate Round 1 x 1...

Part #: 6141 1× Medium Azure

Sticker Sheet for...

Part #: 67022 1× [No Color/Any Color]

Brick Sloped 30° ...

Part #: 85984 1× Black

Tile 2 x 4 with G...

Part #: 87079 2× Black

Plate Special 1 x...

Part #: 92280 4× Light Bluish Gray

Plate Special 1 x...

Part #: 92692 2× Black

Bracket 1 x 2 - 2...

Part #: 93274 1× Dark Bluish Gray

Tile Round 1 x 1 ...

Part #: 98138pr9996 2× Yellowish Green

Brick Special 1 x...

Part #: 98283 4× Light Bluish Gray

Brick Sloped 75° ...

Part #: 98560 1× Black

Bracket 1 x 2 - 1...

Part #: 99781 3× Dark Bluish Gray

The set offers a variety of basic bricks, plates, and tiles in black, light bluish gray, and dark bluish gray. The Medium Azure plant pieces are a nice addition for MOC builders looking to add foliage.

🛒 Where to Buy

eBay

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💎 Notable Parts

Black Brick 1 x 3 (6x) $0.30

Light Bluish Gray Brick Special 1 x 2 with Masonry Brick Profile (4x) $0.40

Medium Azure Plant, Leaves 6 x 5 (3x) $0.75

Est. BrickLink Part Value

$1.45

💡 MOC Potential

⛪ Small haunted chapel or graveyard scene

🏙 Adds spooky details to a LEGO City layout

🌳 Create a spooky haunted forest environment

Community Insights

Real opinions from Reddit and YouTube

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📖 Building Instructions 2

BI 3106, 64+4/65+115G, 70427 V29

Download PDF

BI 3106, 64+4/65+115G, 70427 V39

Download PDF

Inventory Statistics

Unique Parts

189

Official Piece Count

175

Cataloged Inventory Pieces

Minifigures

Spare Parts

The official piece count includes the 14 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Inventory Version: 2

Missing a piece? Use the Missing Piece Checker.