Harry Potter

Cauldron: Secret Potions Classroom

A whole potions classroom hiding inside a bubbling cauldron, if you can forgive the wobble.

Brick Rated Score

3.4/5

Set 76464 · 2026

Pieces661

Minifigs2

Year2026

Set number76464

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The verdict

The concept here is genuinely charming: a fat black cauldron that swings open on a stirring stick to reveal Snape's potions classroom folded up inside.

I fell for the idea immediately, and the interior packs in far more furniture than you'd expect. The trouble is the hinge, which struggles to hold two heavy halves together, so it never quite feels solid closed or steady open. Lovely for a Harry Potter fan who wants the surprise-reveal magic more than a rock-solid display piece.

Best for: Harry Potter fans who love a clever hidden-reveal playset over a sturdy shelf model

The full review

What it is

This is one of LEGO's playful 2026 Harry Potter builds, and the pitch is simple enough to make you grin: a bubbling black cauldron sitting on the shelf, until you nudge the stirring stick and the whole thing splits open to reveal Snape's potions classroom tucked inside. The first time it swung apart I actually laughed, because the amount of furniture folded into that round shell is a lot more than the shape suggests. There are removable tables, a little blackboard, shelves of potion bottles, and brick-built ingredients for Wolfsbane, Polyjuice and Love potions. As a bit of theatre it works beautifully, and reviewers keep reaching for the same comparison: it opens like a Polly Pocket, in the best way.

The catch

I'll be straight with you about where it falls down, and it's the hinge. Each half of the cauldron is fairly heavy, and the two sides pivot on nothing more than a pair of pins threaded through connectors. That's simply not enough to hold this much weight cleanly. Closed, you get gaps around the rim where the edges don't quite meet. Open, the model feels wobbly and a touch unstable, and you find yourself steadying it rather than playing with it. For a set that lives and dies on that one moving trick, the mechanism not feeling reassuring is a real dent. The build itself is quick and a little fiddly, done comfortably inside an hour, so you're not paying for it in engineering satisfaction either. At its RRP of around sixty dollars for just over 650 pieces, it sits in that awkward middle where the novelty has to carry the value.

Who it's for

So who will love it? If you're a Harry Potter fan who prizes the surprise-reveal charm, the hidden interior, and having Snape and Hermione posed in their own little classroom, this will make you happy every time you open it. Kids in the 10-plus range are the obvious sweet spot, and the play value is real once you accept the wobble. Who should skip it? Anyone hunting for a sturdy display piece, or a collector chasing exclusive figures, because neither minifig is new and the closed cauldron doesn't sit as crisply as you'd want on a shelf. Buy it for the reveal, not for the permanence.

The parts story

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

Building this is a fast, slightly fiddly hour, and most of that time goes into the folding interior rather than the shell. You're constructing tiny classroom fittings, the removable tables, the potion shelves, the blackboard, and then working out how they nest inside the two curved cauldron halves so everything tucks away when it closes. It's satisfying in a puzzle-box way, though the hinge assembly (two pins through connectors) is the fussiest and least convincing part of the whole job, and you'll feel how light-duty it is the moment you test the swing.

The standout element is easily Hermione's otter Patronus, moulded in a very opaque, milky plastic as part of the LEGO Harry Potter 25th anniversary Patronus collection, a genuinely collectible little piece. You also get 1 of 14 randomised Hogwarts portrait tiles, which adds a nice bit of chase to the box. Beyond those, the parts are mostly the printed potion bottles and small brick-built ingredients that sell the classroom fantasy. There's nothing here in the way of dramatic new moulds or bold recolours, so the value story rests on the theme and the two accessories rather than the parts count itself.

Fun facts

01Hermione's otter Patronus in this set is part of LEGO's Harry Potter 25th anniversary Patronus collection, moulded in a milky, very opaque plastic.
02Every box includes 1 of 14 randomly packed collectible Hogwarts portrait tiles, adding a small chase element to the set.
03The cauldron opens on its stirring stick to unfold a full potions classroom inside, a hidden-reveal design reviewers repeatedly compared to a Polly Pocket.
04It launched in January 2026 with an RRP of $59.99 (£54.99 / 59.99 euro) and included Professor Snape and Hermione Granger minifigures.