Gear Cube vs Square-1
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Gear Cube
The Gear Cube is a 3x3 mechanical twisty puzzle invented by Dutch puzzle designer Oskar van Deventer in 2009. It features an internal gear mechanism where turning one face forces the adjacent faces to rotate simultaneously, a feature inspired by the builder's earlier Caution Cube. Despite its complex mechanical appearance, the geared design limits the number of possible permutations, making it not...
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Square-1
Square-1, also known as Cube 21, is a shape-shifting twisty puzzle invented in Czechoslovakia by Karel Hršel and Vojtěch Kopský and released commercially in 1990. Unlike standard 3×3×3 cubes, its mechanism allows the three layers to be cut at varying angles, causing the puzzle to deform into non-cubic polyhedral shapes when scrambled. Solving requires returning the pieces to a cube shape and then...
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