Tern Key is a delightful time waster and a gentle introduction to the greater world of n-arys!
N-arys involve repeating a sequence of moves in a predictable and repetitive manner as the sequence grows in complexity. It make for a genre of puzzles that people enjoy for meditative purposes or to disguise the logical sequence in unusual formats or subtle construction.
Tern Key seeks to introduce the solver to working in 3 after dealing with binary which can be slightly unintuitive since people find it easier and quicker to work in binary or quaternary due to the even numbers. But it's a delight to slide the acrylic pieces with metal pins to grasp as the solver learns and absorbs the ternary logic.
Here is more information on the puzzle: https://cubicdissection.com/products/tern-key-2013
For the first edition of a puzzle from 2013, it is in excellent shape and I can't find any flaws or issues with it.
I accept and prefer using Zelle as my payment method of choice.
I
accept Paypal. I prefer Friends & Family due to the IRS tax rules.
But if you rather pay with Goods & Services, I will accommodate that
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I accept Wise for international buyers.
I am willing to consider other payment methods.
Shipping is USPS or UPS
Buyer chooses the shipping service and shipping speed, First Class or
Priority (assuming the package is under the weight limit for First
Class).
Insurance is optional, but buyer has to cover it if it is desired.
I ask the winner to hold off on paying until after I calculate and
message final shipping costs to be added to the final bid.
