Valve Pocket Puzzle Stationery this elegant and surprising expression

this elegant and surprising expression of the Fibonacci sequence would make mother nature proud

An intermediate-level Tavern Puzzle that requires a bit more effort than Iron Heart or Old Shackles

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an elusive technique of the ancient magi has been wrought in stone

science writer Mary Roach

Valve Pocket Puzzle Stationery this elegant and surprising expressionValve is a pocket puzzle that feels like cracking the lock to a safe. You'll have to imagine the nature of the hidden mechanism that allows the inner ring to rotate independently of the silver middle ring and the exterior piece of the assembly. Releasing the valve will separate the puzzle into four pieces. Twisting them all back together again is equally difficult. Valve is designed by Finnish puzzle master Vesa Timonen who has also created a variety