They are often face-turning, but commonly exist in corner-turning and edge-turning varieties. Puzzles like the Rubik's Cube which are manipulated by rotating a section of pieces are popularly called twisty puzzles. In the unsolved condition colours are distributed amongst the pieces of the cube. Each of the six faces is a different colour, but each of the nine pieces on a face is identical in colour, in the solved condition. The most famous of these puzzles is the original Rubik's Cube, a cubic puzzle in which each of the six faces can be independently rotated. Often, the solution is required to be some recognisable pattern such as "all like colours together" or "all numbers in order". As a generalisation, combination puzzles also include mathematically defined examples that have not been, or are impossible to, physically construct.Ī combination puzzle is solved by achieving a particular combination starting from a random (scrambled) combination. Each rotating side is usually marked with different colours, intended to be scrambled, then 'solved' by a sequence of moves that sort the facets by colour. Collectively known as twisty puzzles, the archetype of this kind of puzzle is the Rubik's Cube. Many such puzzles are mechanical puzzles of polyhedral shape, consisting of multiple layers of pieces along each axis which can rotate independently of each other. A combination puzzle, also known as a sequential move puzzle, is a puzzle which consists of a set of pieces which can be manipulated into different combinations by a group of operations.
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