Hidden Side

Newbury Abandoned Prison

A rusted-out prison door that swings open onto a haunted twin, built for a ghost hunt that no longer exists.

Brick Rated Score

3.7 out of 53.7/5

Set 70435 · 2020

Pieces400
Minifigs4
Year2020
Set number70435

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The verdict

I still get a little thrill cranking that huge burnt-orange door open and watching the whole facade flip into its decayed, spirit-infested version underneath.

It is a genuinely clever piece of engineering wearing a genuinely creepy paint job, and the olive green and light bluish grey color story nails the abandoned look better than almost anything else LEGO made that year. My honest caveat is that this set was built around an app that LEGO shut off in 2023, so you are buying it now purely for the physical build and the display piece, not the augmented reality hunt it was designed for. If you love a good transformation gimmick and don't mind a set that leans on stickers to sell its atmosphere, it still delivers a satisfying afternoon build. If you were hoping to actually catch ghosts with your phone, that chapter is closed for good.

Best for: Hidden Side collectors and fans of transforming, spooky-building-facade sets who don't need the app to enjoy it

The full review

What it is

The first time that big rusted prison door creaks open and the whole building flips its disguise, you get why Hidden Side had real fans. Newbury Abandoned Prison is one of the more distinctive builds in the line, a squat, decayed cell block in olive green and light bluish grey that genuinely looks like something out of a ghost story rather than a toy. At 30cm wide it has real presence on a shelf, and the transformation from normal prison to possessed prison is mechanically clever without feeling fragile.

The catch

Here is the honest part. This set's entire identity was built around the Hidden Side app, the augmented reality ghost hunt you were meant to play through your phone camera, and that app has been dead since 2023. So what you are actually buying today is the physical shell of a bigger idea, a fun transforming building with four minifigs and a memorable exclusive dog, but without the layer that made LEGO market it as something new. Add in a build that relies on quite a lot of stickers to fake the grime and decay, and a piece count that feels a little light for the price when it launched, and you have a set that is good rather than essential.

Who it's for

Get this one if you collect Hidden Side, love spooky architecture, or just want a clever fold-and-flip mechanism to show off. Skip it if you were hoping the AR ghost hunting would still work, or if stickers over printed parts are a dealbreaker for you. As a display piece and a nostalgic slice of a short-lived theme, it still earns its shelf space.

The parts story

What the build is actually like, and the pieces worth knowing about.

Building it is a steady, satisfying process rather than a showpiece one, you stack up the cell block walls and slowly start to understand how the transformation hinges are hidden inside the structure until that door finally swings and the whole thing flips its disguise. The mechanism doesn't feel like an afterthought bolted onto a normal building, it's genuinely load-bearing in the design, which is more than you can say for some of the theme's later, cheaper sets.

The standout piece is that huge burnt-orange prison door itself, it's the visual anchor of the whole model and it is what sells the set on a shelf. The real collector's item, though, is the exclusive chihuahua minifigure with a puzzled, grumpy expression that never showed up anywhere else, alongside four named minifigs (Jack, Rami, El Fuego and security guard Nate Lockem) you won't find bundled together in any other set. Stickers do a lot of the heavy lifting for the decayed textures rather than printed parts, which keeps cost down but means careful application matters if you want the abandoned look to read well.

Fun facts

  • 01The set was released August 24, 2020 and retired that December, a short shelf life even by Hidden Side's standards.
  • 02Its exclusive chihuahua figure, nicknamed Maximus, has a puzzled or grumpy expression that has never appeared on any other chihuahua piece since.
  • 03The Hidden Side companion app that the whole set was designed around was discontinued in January 2023, ending the AR ghost-hunting feature for good.
  • 04Original US retail was $39.99, and sealed copies now trade around $60 to $62 on the secondary market.

What other builders say

This write-up is grounded in real reviews and builder discussion, not just one opinion. A few worth reading:

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