Mystery Castle (70437-1) is a Hidden Side LEGO set released in 2020 with 1,035 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing Hidden Side sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 6 minifigures and 314 unique part types.
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Buying checklist
Quick context before you buy this set used or verify a marketplace listing.
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Release year
2020 (6 years ago — may be retired)
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Catalog scale
1,035 parts listed · 314 inventory lines tracked
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Minifigures
6 in this set's inventory — verify completeness when buying used
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Build manual
Digital booklet available on this page — use it to verify bag contents
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Build complexity
Large set — expect sticker sheets or multiple subassemblies; inspect photos closely
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Shipping weight (est.)
~2,066 g for parts inventory (excludes box/minifig packaging)
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Before you buy used
Run the completion checker, compare photos to the inventory, and check live listings for sealed pricing
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Market value
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Building instructions
Official LEGO instructions — read on BrickID
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Minifigures in Mystery Castle
Parts in this set
314 parts · page 1 of 7 · updating…
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Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End Section40379 · ×4 · Black -
Animal Body Part / Plant, Tail / Neck / Branch / Trunk, Middle Section with Pin, Round Pin Hole40378 · ×2 · Black -
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Medium87747 · ×4 · Black -
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small53451 · ×2 · Black -
Animal Body Part, Horn (Cattle) / Tentacle / Vine / Branch / Tongue - Long13564 · ×5 · Black -
![Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip]](https://cdn.rebrickable.com/media/parts/elements/4542590.jpg)
Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip]48729b · ×1 · Light Bluish Gray -
Bar 3L87994 · ×2 · White -
Bar 4L (Lightsaber Blade / Wand)30374 · ×1 · Reddish Brown -
![Bar 7 x 3 with Double Clips (Ladder) [Straight Clips]](https://cdn.rebrickable.com/media/parts/elements/6030812.jpg)
Bar 7 x 3 with Double Clips (Ladder) [Straight Clips]6020 · ×1 · Reddish Brown -
Bracket 1 x 2 - 1 x 2 Inverted99780 · ×2 · Dark Bluish Gray -
Bracket 1 x 2 - 2 x 2 Inverted99207 · ×6 · Black -
![Bracket 3 x 2 - 2 x 2 [aka Space Seat]](https://cdn.rebrickable.com/media/parts/elements/459826.jpg)
Bracket 3 x 2 - 2 x 2 [aka Space Seat]4598 · ×1 · Black -
Brick 1 x 13005 · ×27 · Dark Tan -
Brick 1 x 13005 · ×25 · Light Bluish Gray -
Brick 1 x 1 x 314716 · ×1 · Black -
Brick 1 x 1 x 314716 · ×4 · Light Bluish Gray -
Brick 1 x 1 x 5 with Solid Stud2453b · ×2 · Light Bluish Gray -
Brick 1 x 23004 · ×1 · Medium Lavender -
Brick 1 x 23004 · ×7 · Black -
Brick 1 x 23004 · ×17 · Light Bluish Gray -
Brick 1 x 23004 · ×2 · Dark Tan -
Brick 1 x 23004 · ×1 · Dark Bluish Gray -
Brick 1 x 2 x 2 with Inside Stud Holder3245c · ×4 · Black -
Brick 1 x 2 x 2 with Inside Stud Holder3245c · ×5 · Light Bluish Gray -
Brick 1 x 2 x 3 with Bottom Stud Holder22886 · ×3 · Light Bluish Gray -
Brick 1 x 2 x 5 with Hollow Studs2454b · ×1 · Light Bluish Gray -
Brick 1 x 33622 · ×4 · Dark Bluish Gray -
Brick 1 x 33622 · ×3 · Black -
Brick 1 x 33622 · ×12 · Light Bluish Gray -
Brick 1 x 43010 · ×2 · Black -
Brick 1 x 43010 · ×15 · Light Bluish Gray -
Brick 1 x 43010 · ×4 · Dark Tan -
Brick 1 x 43010 · ×1 · Reddish Brown -
Brick 1 x 63009 · ×1 · Light Bluish Gray -
Brick 2 x 23003 · ×1 · Black -
Brick 2 x 2 Corner2357 · ×5 · Light Bluish Gray -
Brick 2 x 33002 · ×1 · Black -
Brick 2 x 33002 · ×3 · Light Bluish Gray -
Brick 2 x 43001 · ×1 · Dark Tan -
Brick 2 x 43001 · ×2 · Light Bluish Gray -
Brick and Axle Separator v2.096874 · ×1 · Dark Turquoise -
Brick Arch 1 x 34490 · ×2 · Light Bluish Gray -
![Brick Arch 1 x 3 x 3 [Gothic]](https://cdn.rebrickable.com/media/parts/elements/6225228.jpg)
Brick Arch 1 x 3 x 3 [Gothic]13965 · ×4 · Light Bluish Gray -
![Brick Arch 1 x 3 x 3 [Gothic]](https://cdn.rebrickable.com/media/parts/elements/6038531.jpg)
Brick Arch 1 x 3 x 3 [Gothic]13965 · ×2 · Black -
Brick Arch 1 x 43659 · ×4 · Light Bluish Gray -
Brick Arch 1 x 43659 · ×1 · Dark Tan -
![Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports]](https://cdn.rebrickable.com/media/parts/elements/6075062.jpg)
Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports]14395 · ×2 · Black -
![Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports]](https://cdn.rebrickable.com/media/parts/elements/6075066.jpg)
Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports]14395 · ×14 · Light Bluish Gray