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Key+Lock Cube
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A puzzle consisting of two cubes and with two solutions. Two 3x3x3's with some pieces glued on one face.

The reason for inventing this puzzle was to create a puzzle which consists of two cubes and which has two solutions. In the first solution (which is the starting position too) both 3x3x3's are solved by color, like any other cube.
In the second solution both 3x3x3 are twisted into a specific pattern: the so-called cube-in-cube. In this state both 3x3x3's can be put together to give the illusion of a 3x3x7.



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Rubik's Void

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