Cast Puzzles Explained: How the Difficulty Ratings Work
Printed difficulty ratings on cast metal puzzles compress several incompatible measures into one number. Here is what they encode, what they miss, and how to pick your next level sensibly.
Mechanical Puzzles: Metal
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Caring for Metal Puzzles: Tarnish, Plating, and Storage
Polishing does more damage to metal puzzles than solving ever will. Here is what conservation guidance says about tarnish, plating, humidity control, handling, and the storage materials to keep away.