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The most valuable Hidden Side LEGO sets from the 2020s by current market value. This list ranks 15 sets by current BrickPicker value, refreshed from live market data. Right now the top spot belongs to Mystery Castle at $200. The top 5 alone account for about 66% of the value on this list. Every entry links to its full price history and marketplace listings. Updated 2026-07-22.
Top 5 hold 66% of this list's value ($731).
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| Name | / piece | |||
|---|---|---|---|---|
| 1 |  Mystery Castle Hidden Side · 2020 | $200 | +100% | $0.19 |
| 2 |  Phantom Fire Truck 3000 Hidden Side · 2020 | $100 | +67% | $0.13 |
| 3 |  Haunted Fairground Hidden Side · 2020 | $65 | +30% | $0.14 |
| 4 |  Newbury Abandoned Prison Hidden Side · 2020 | $60 | +50% | $0.15 |
| 5 |  The Lighthouse of Darkness Hidden Side · 2020 | $56 | +11% | $0.10 |
| 6 |  Supernatural Race Car Hidden Side · 2020 | $40 | +33% | $0.16 |
| 7 |  J.B.'s Submarine Hidden Side · 2020 | $37 | +84% | $0.16 |
| 8 |  Welcome to the Hidden Side Hidden Side · 2020 | $35 | +74% | $0.18 |
| 9 |  El Fuego's Stunt Plane Hidden Side · 2020 | $33 | +9% | $0.11 |
| 10 |  Newbury Subway Hidden Side · 2020 | $25 | -17% | $0.07 |
| 11 |  Jack's Beach Buggy Hidden Side · 2020 | $20 | +1% | $0.12 |
| 12 |  Newbury Juice Bar Hidden Side · 2020 | $19 | +46% | $0.15 |
| 13 |  Chef Enzo's Haunted Hotdogs Hidden Side · 2020 | $15 | — | $0.35 |
| 14 |  Drag Racer Hidden Side · 2020 | $15 | +14% | $0.11 |
| 15 |  El Fuego's Stunt Cannon Hidden Side · 2020 | $12 | — | $0.26 |
The 70437 Mystery Castle is the most valuable, worth about $200 on the current market.
Around $200 — that's the current BrickPicker value of the 70437 Mystery Castle, the top-ranked set on this list.
This list ranks 15 hidden side lego sets of the 2020s by current market value, refreshed from live sales data.