Valve Pocket Puzzle Stationery white borders

white borders

science writer Mary Roach

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

or solving visual brain teasers

Valve Pocket Puzzle Stationery white bordersValve 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