Set values / LEGO Mystery Castle #70437
LEGO Mystery Castle 70437
Hidden Side · 2020

LEGO Mystery Castle #70437

Retired 2020-11-22
Value now (new)
$207
+107% vs retail
Retail price$100
Value now (used)$162
New price range$158 to $343
Prices as of 2026-07-19
Track this set free
HOLD

Is LEGO Mystery Castle a good investment?

LEGO Mystery Castle is retired and trades +107% versus its original retail price. Retired sets usually keep climbing as sealed supply dries up, so most collectors hold and sell into a spike rather than flipping now.

Track Mystery Castle and get a sell alert
🔒 Unlock the full picture
Daily price history, retirement forecast, sell-window alerts and your ROI on this set.
See plans, from $4.99/mo

About LEGO Mystery Castle

The LEGO Mystery Castle (set 70437) is a Hidden Side set released in 2020 with ? pieces. It has retired and is no longer produced by LEGO, which is often when collectible sets start to gain value.

It originally sold for $100. Today, sealed copies trade around $207 on the secondary market, a gain of 107% versus its original price. Used copies average $162, with listings ranging from $158 to $343.

Prices for the LEGO Mystery Castle come from live BrickLink marketplace data, updated regularly. To see its full price history, retirement forecast and the best window to sell, track it in your free BrickGains portfolio.

Specifications

Set number70437
ThemeHidden Side
Year released2020
Pieces-
Price per piece-
Original retail price$100
StatusRetired 2020-11-22
Current value (new)$207
Change vs retail+107%
🧱 BrickGains
Add LEGO Mystery Castle to your portfolio
Track what you paid vs what it is worth, and get an email the moment it is time to sell.
Track it free