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This puzzle is quite a challenge to figure out, quite a journey of moves! It requires a _minimum_ of 151 steps to open, but only if you know EXACTLY what you're doing, and you will certainly not know exactly what's going on, the first time around (and around and around). Even knowing how it works, I get lost in its amazing complexity, as I fiddle with it again, from time to time!
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The fully-made copies sold by NKD were originally sold for 3883 Euro.
This is a DIY kit copy which functions perfectly, which I am selling for what I think is a fair price, given the amount of work that went into it, and far less than the original fully-made ones.
I can no longer link to the original listing, as the NKD site is no more.
Here, instead is the Boxes & Booze review of the Tetra: https://www.boxesandbooze.com/boxesandbooze/nkd-puzzle-tetra
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Will ship from Nova Scotia, Canada.
For payment, I accept Paypal and also Wise. If the buyer is in Canada, an e-money transfer is also possible.
Kept in a smoke-free, pet-free home.
Buyer is to pay for shipping, DO NOT PAY until shipping cost has been determined and added to the invoice.