Brain Teasers Mefferts | David’S Gear Cube – Meffert’S Rotation Puzzle-My767

David’S Gear Cube Is A Geared Twisty Puzzle Inspired By The Gear Cube. It Was Conceived By David Tzur (Previously Known As Alex Polonsky) And Developed By Oskar Van Deventer, One Of The World’S Most Prolific Puzzle Designers.