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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. This puzzles combines a corner-and-center-turning gear cube with a twisty 2x2x2 cube. Whereas it is easy to return the puzzle to its cubic shape, it is quite a challenge to get all gear segments to their right face, and even harder to solve the puzzle as a whole.