Snake cube

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Unsolved cube ...
Unsolved cube ...
... and solved cube.
... and solved cube.

Snake cube is mechanical puzzle, a chain of 27 small cubes connected by an elastic band running through them. Cubes can rotate free. The aim of the puzzle is to arrange the chain in such a way that they will form 3 x 3 x 3 cube. Its shape is similar to that of a Rubik's Cube. There are many versions of this puzzle.

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