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Set 70437 Mystery Castle
Hidden Side

Mystery Castle

Set 70437 Mystery Castle belongs to LEGO®'s Hidden Side line, released in 2020, which paired ordinary builds with an app that turned them into haunted scenes. With 1,035 pieces and six minifigures, it forms a multi-storey castle, and this page lists every part and colour used to build it.

Set number
70437
Year
2020
Pieces
1,035
Minifigures
6
Theme
Hidden Side
Different parts
314
What can I build with it?

View the official building instructions at LEGO® ↗

Parts list 314

As BrickLink list (XML)

Import on BrickLink: Wanted → Upload, upload the file (or paste its content), pick a Wanted List and add the parts.

Spare parts (26)

These extra parts come with the set in case one gets lost.

Minifigures 6

Alternative models

Fan models by Rebrickable users that you can build (mostly) from this set’s parts. Instructions are available from the designers.

All 2 ideas at Rebrickable ↗

What can I build with it?

Description

A castle built from many small parts

A convincing castle needs towers, battlements and wall sections that all look different, and that's exactly what the 314 distinct parts in this set deliver. Rather than repeating the same bricks across large wall surfaces, windows, turrets and roof shapes alternate throughout, so the model reveals different details from every angle. The colour scheme of light bluish grey, black, dark bluish grey and dark tan keeps the building looking stony and dim without any single area turning too bright. Working through the parts list makes it easy to see which pieces form the masonry and which serve as window bars or roof tiles. That interplay of four core colours also gives the finished model a calm, coherent look despite the part count, lending it a clear architectural line rather than a chaotic jumble of details.

Six minifigures for scene-building

Six minifigures give you a decent-sized cast for stories around the castle, such as a group exploring the grounds while something is clearly off inside. For a set in the roughly 1,000-piece bracket, that's a generous figure count, and it spreads comfortably across the building's several rooms. The interior offers enough alcoves and platforms to place figures in different spots rather than lining them all up outside the entrance. That means you can decide during assembly exactly where each figure ends up, whether at a window, on the stairs or out in the courtyard, instead of grouping all six in a single corner once the build is finished.

Building experience and display

At just over 1,000 pieces, Mystery Castle sits in the mid-to-large range for themed sets, better suited to builders happy to spread the project across a few sessions than to finish in one sitting. The finished castle works well as a display piece, its towers and height giving it presence even from a distance. Builders who skip the Hidden Side app still end up with a self-contained model that pairs nicely with other fantasy or spooky sets to build out a larger scene. The dark colour scheme in particular makes it easy to line the castle up alongside similarly toned sets for a cohesive, larger display without the individual builds looking mismatched.

FAQ

How many pieces does the 70437 Mystery Castle set have?
It has 1,035 pieces in 314 distinct parts, plus six minifigures.
Who is this castle set suitable for?
With over 1,000 pieces split across several building stages, it suits builders comfortable with larger, multi-section models rather than absolute beginners.
Do I need the Hidden Side app to build or display it?
No, the castle stands on its own as a physical build; the app was an optional extra feature of the theme.

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