LEGO® Mystery Castle 70437

Hidden Side20201,035 piecesRetired

Value new · sold average, 6 months

$185.04

BrickLinkNew listings, shipping to the USSee listings ›BrickLinkUsed listings, shipping to the USSee listings ›

Prices updated Oct 6, 2026, 23:30 UTC.

Launch price at LEGO$99.99

Used · sold avg, 6 months—Too few sales

Price history

NewUsedLEGO retail

Monthly average of real sales, in USD at today's exchange rate.

What is LEGO Mystery Castle 70437 worth?

A new, sealed Mystery Castle (70437) sold for $185.04 on average over the last six months, across 4 sales. LEGO no longer sells it in the US, so collectors set the price (it launched at $99.99).

Set facts

Set number: 70437
Pieces: 1,035
Released: 2020
Theme: Hidden Side
Price per piece: $0.18
Status: Retired

Questions

Is LEGO 70437 Mystery Castle retired?

Yes. LEGO no longer sells Mystery Castle in the US, so its value now comes from what collectors pay for it: $185.04 new on average over the last six months.

How are these prices calculated?

Values are quantity-weighted averages of real sales of the set over the last six months, updated every night. LEGO retail prices come from Brickset. Other currencies are converted at the European Central Bank's daily rate.

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