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4x4x4 Logic Cube - based on a 1992 Romanian patent
4x4x4 Logic Cube is based on a 1992 Romanian patent and is more reliable and durable then the Hungarian version.
This puzzle is a more daunting challenge than the 3x3x3 cube. The number of pieces is far greater, and there are no "fixed" pieces to serve as a reference.
The puzzle has an ingenious mechanism. The sphere has eight perpendicular grooves, aligned two by two, for the center tiles to slide in. A specially shaped steel frame prevents the sphere from becoming misaligned with the rest of the cube. There are two edge pieces at each face intersection. The corner tiles are very similar to the 3x3x3 Rubik cube.
This puzzle is a challenge for anyone!