Harry Potter

Hogwarts Castle: Potions Class

A tiny dungeon classroom that folds shut like a secret, and Snape steals every scene.

Brick Rated Score

3.8/5

Set 76431 · 2024

Pieces396

Minifigs4

Year2024

Set number76431

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The verdict

I love how this one hides itself.

Open it up and you get a proper little potions dungeon, cauldron, bubbling flasks, a blackboard scrawled with instructions. Close it and the whole thing collapses into a neat box that tucks under the Great Hall. That folding trick is genuinely clever engineering for something this small. Snape is the real reason to buy it though, printed arms and a scowl that made me laugh out loud when I built him. If you already own the modular Hogwarts sets, this slots in nicely. If you're buying it alone at full price, I get why some builders felt shortchanged.

Best for: modular Hogwarts collectors who want another classroom to tuck under the Great Hall

The full review

What it is

I'll be honest, my favorite part of this set isn't even the build, it's what happens after you finish it. You get this compact little dungeon classroom, complete with a cauldron, a shelf of potion bottles, and a blackboard covered in instructions, and then you can fold the whole structure flat and slide it under your Great Hall like it was never there. That's a neat piece of design for a set this size, and it's the third time LEGO has used the Potions Class idea, so they've clearly gotten good at it.

The catch

Where it stumbles a little is value. At $39.99 for 396 pieces, several reviewers pointed out that's a steep price per piece, especially once you notice how much of the detail, the ingredient labels, the stone wall texture, comes from stickers rather than built-up brick work. It's not a bad set, it's just a small one asking a full-size price, and it shows most clearly if this is the only Harry Potter set you're buying this year.

Who it's for

If you're already collecting the modular Hogwarts Castle series, this is an easy yes, it's built to slot right into that collection and adds a room you don't already have. If you're a Snape fan, also an easy yes, his minifig alone is worth a look. But if you want your money to go further, I'd point you toward one of the bigger Hogwarts sets first and treat this as a top-up purchase later.

The parts story

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

The build itself is quick, an afternoon project rather than a weekend one, and most of the fun is in the little mechanical hinge that lets the whole classroom swing open and shut. Watching it fold down from a lived-in dungeon into a flat storage box is the kind of thing that makes you want to do it again just to show someone.

Snape's printed arms are the standout piece here, they give his robe a sense of movement that plain arms never manage, and his alternate scowling face is a nice touch for display. The potion bottles and cauldron pieces are fun small elements too, though the set leans on stickers more than I'd like for the wall details and ingredient jars, which keeps the part count feeling a bit padded for the price.

Fun facts

01This is the third LEGO Potions Class set, following earlier versions in 2018 and 2020, each one redesigning the room and minifigs.
02Two of the four minifigures in this set are exclusive to it, meaning you can't get them in any other current LEGO set.
03The set is designed to physically connect underneath the larger Hogwarts Castle modular sets, folding flat so it stores as a compact block when not on display.
04It launched June 1, 2024 at $39.99 and was retired by LEGO around December 2025.