Set Facts
- The set includes a haunted-tree model that interacts with the LEGO AR app.
- Players can hunt ghosts and battle the boss ghost Lady E using the app.
- The model combines physical play with digital interactions for both single and multiplayer experiences.
- Welcome to the Hidden Side was designed by LEGO designer Niek van Slagmaat.
Regional Retail Prices (LEGO.com/Store)
Welcome to the Hidden Side Reviews
Bricksfanz
“It's one of the new waves smallest sets but because of its unique take on the Hidden Side story, offers something different from other Hidden Side sets. The actual scene is a little boring compared to some of the other Hidden Side sets, but the addition of the unique... More Minifigures, certainly make it worth picking up.”
BrickFanatics
“As an accompanying set to the rest of the theme it's great to have the Hidden Side represented and the inclusion of the three ghostly minifigures will not only add tons of play value to this set but also any others in the theme. As a stand alone set though, especially as it... More is the first to represent the ghostly realm, it feels a little on the light side. If you are a huge fan of this theme, then definitely add this to the collection, but if you're new to the theme it is probably better to look elsewhere for now.”
Theme Analysis
Lifespan
14 mos (this set 19 mos)
Annual growth
+4.88% (this set +5.46%)
This set's annual growth (CAGR) vs. subtheme
Community Stats
Welcome to the Hidden Side currently ranks #14 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 Welcome to the Hidden Side set 70427 was released on January 2, 2020, retailing for $20, it has since been retired. New, unopened sets are valued at $24, while used sets sell around $18.
Read more
Fans of virtual reality and video games will love the amazing LEGO® Hidden Side universe, where physical and digital worlds merge in an incredible, single or multiplayer augmented reality (AR) experience. This Welcome to The Hidden Side (70427) ghost-hunting toy combines the open creative play of LEGO building toys with an app – so interaction with the model triggers events in the digital world. Digitally interactive building toy for kids This Welcome to the Hidden Side model reveals a ghostly world when viewed through a smart device equipped with the free LEGO AR app. Kids then get to hunt ghosts, battle the boss ghost Lady E and explore and solve mysteries, either alone or online with friends.
This LEGO® Hidden Side building toy combines the open creative play of LEGO building playsets with an app for an amazing single or multiplayer augmented reality (AR) play experience. Ideal for kids aged 7 and up.
What’s in the box? A digitally interactive LEGO® Hidden Side...
Description provided by LEGO©