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Penrose 3x3 is a 3-colored, stickerless cube in which various edges of the cube have been rounded off to form a repeating pattern across the cube. The presence of only 3 colors and multiple identical-looking pieces introduces additional parities, which makes solving the Penrose 3x3 a unique challenge.

CuberSpeed Curve 3X3 Stickerless Speed Cube Penrose Cube Puzzle - BKAVAYY8F