Set Facts
- The LEGO Hidden Side Mystery Castle (70437) set is designed to interact with an augmented reality app to explore and hunt ghosts.
- The set includes minifigures of Jack, Parker, Vaughn, Nehmaar Reem, and 2 Shadow-Walkers.
- The possessed castle model folds out.
Regional Retail Prices (LEGO.com/Store)
Mystery Castle Reviews
The Brothers Brick
“The Mystery Castle will be a nice addition for anyone looking to add a reasonably priced spooky castle to their collection. It doesn't have the color splash of the Scooby Doo Mystery Mansion, but the inclusion of lots of light blue colors in the transparent pieces and... More stickers keeps it from becoming boring. The astronomy tower in dark tan with its curved roof and large telescope makes for a nice accent to help this castle stand out from its predecessors.”
New Elementary
“Overall I enjoyed the build experience, with a couple of minor exceptions where access was a bit limited. The finished model is quite substantial, and even without the accompanying app the Castle provides plenty of scope for ghost-hunting scenarios and play. It also offers... More potential for MOCing with interesting pieces if that is what attracts you to the set and its component parts.”
Theme Analysis
Lifespan
14 mos (this set 14 mos)
Annual growth
+3.72% (this set +8.49%)
This set's annual growth (CAGR) vs. subtheme
Community Stats
Mystery Castle currently ranks #18 out of the top most owned sets in Hidden Side.
About Hidden Side

The LEGO Hidden Side theme was introduced in the summer of 2019 that was tech influenced and included a storyline and an app game (Apple App Store and Google Play). The theme is focused around the haunted town of Newbury and is designed with an augmented reality (AR) app, allowing users to capture ghosts while solving mysteries within the spooky town.
Summary
Hidden Side Mystery Castle set 70437 was released in June 2020, retailing for $100, but has since been retired. New, unopened Mystery Castle sets are valued at $203, while used sets can be found for $168.
Read more
Fans of virtual reality and video games love the amazing LEGO® Hidden Side universe, where physical and digital worlds meet to provide an incredible, single or multiplayer augmented reality (AR) play experience. This LEGO Hidden Side Mystery Castle (70437) playset combines a buildable LEGO model with an app, so interaction with the model triggers events in a digital world.
The mystery castle springs to life when viewed through a smart device with the LEGO Hidden Side AR app. Children then get to explore, solve mysteries, hunt ghosts and battle boss ghost The Maw in an exciting digital world. The possessed castle model also folds out, setting the scene for action-packed role play with the Jack, Parker, Vaughn, Nehmaar Reem and 2 Shadow-Walker minifigures.
Description provided by LEGO©