Jiutong Lock

The Jiutong Lock from Tea-Sip is a nine-piece wooden secret-lock puzzle: three identical long strips form a cross-hatched frame, five uniquely shaped short blocks fill the voids inside it, and one key piece locks everything into a solid, palm-sized structure. The challenge runs both ways — find the hidden key piece to take it apart, then rebuild the lock from loose pieces.

Specifications

How It Plays

Assembled, the Jiutong Lock reads as one solid block of wood, so the first minutes are pure fingertip work: pressing each face, nudging every seam, hunting for the one component that gives. Most people stall here because they assume a piece must slide straight out. It doesn’t. The lock opens only when you spot the key piece by its distinctive profile and rotate it 90 to 180 degrees — the moment it turns, the structure loosens and the pieces separate in sequence.

Reassembly is the second, harder half of the puzzle. You cross the three long strips into their lattice framework, insert the five short blocks into the specific voids they were shaped for, seat the key piece last, and give it the final twist that locks the structure back into a solid whole.

Who It’s For

This is a puzzle for people who like mechanical problems they can hold: fans of wooden interlocking puzzles, desk workers who want a screen-free break object, and anyone building a shelf of brain teasers. It also makes a pointed gift for the friend who claims nothing stumps them — a locked wooden block needs no instructions.

FAQ

How do I open the Jiutong Lock?

Locate the key piece — it has a distinctive profile that sets it apart from the other eight pieces — and rotate it 90 to 180 degrees. That single rotation releases the structure, and the remaining strips and blocks can then be separated.

Can it be reset after solving?

Yes, fully. Cross the three long strips into their lattice, insert the five short blocks into their matching voids, seat the key piece, and finish with one twist. Reassembly reverses disassembly exactly, so the puzzle returns to its original locked state every time.

What if I get completely stuck?

Stop forcing pieces — nothing here needs pressure. Re-examine each component for the one with the odd profile; that is always the key piece, and rotation, not pulling, is what moves it. Every Tea-Sip Jiutong Lock opens by this same method.

Is there replay value after the first solve?

Yes. Disassembly and reassembly are separate skills: finding the key piece does not mean you remember which void each short block belongs in. Scramble the nine pieces and rebuilding the lattice stays a genuine puzzle.

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