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My wife rolled her eyes when I spent the first hour just turning the four steel pieces over in my hands, but once they clicked apart I actually yelled. The machining is flawless, no rough edges anywhere, and it's heavier than it looks.

I expected to solve it in ten minutes and spent the better part of an evening on the couch turning those four identical steel pieces over in my hands. The machining is gorgeous, no sharp edges, and the way they lock together feels almost magnetic. It's the rare puzzle I don't want to put down even a

Those four stainless steel pieces look identical until you start turning them, and then it's a whole different story. I left it on my desk and kept picking it up between emails for three days before it finally clicked apart. Heavier than it looks, which I like.