X-Cube
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The X-Cube is a twisty puzzle designed by Dane Christianson and initially released by Moving Parts, L.L.C. in 2013. It is shaped like an X or + with a 3x3x3 base shape with extra cubies extending from the side pieces. This allows the puzzle to shapeshift.
Solving
There are two predominant methods for solving the X-Cube. One such method is reduction. By bringing the puzzle back into an "X" shape, one can use commutators to pair edge pieces and corner pieces. The cube is then solved like a 3x3x3, with a chance for OLL and PLL parity. The other method also begins with returning to the "X" shape, but also solves the white and yellow centers. The remaining pieces may be solved in a similar method to 5x5 centers, with respect for the colors on the sides.