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Rubik's Cubes


http://t3.gstatic.com/images?q=tbn:ANd9GcS4OiyaQERpvokBKsuuV0MF96xzaH7qiIK5_CF-PcEl6x8XGxtsc83V9htjRubik's Cube is a 3-D mechanical puzzle invented in 1974  by Hungarian sculptor and professor of architecture Ernő Rubik. Originally called the "Magic Cube", the puzzle was licensed by Rubik to be sold by Ideal Toy Corp. in 1980 and won the German Game of the Year special award for Best Puzzle that year. As of January 2009, 350 million cubes had been sold worldwide making it the world's top-selling puzzle game. It is widely considered to be the world's best selling toy. In a classic Rubik's Cube, each of the six faces is covered by nine stickers, each of one of six solid colours, (traditionally white, red, blue, orange, green, and yellow).  A pivot mechanism enables each face to turn independently, thus mixing up the colours. For the puzzle to be solved, each face must be returned to consisting of one colour. Similar puzzles have now been produced with various numbers of stickers, not all of them by Rubik.
A standard Rubik's cube measures 5.7 cm (approximately 2¼ inches) on each side. The puzzle consists of twenty-six unique miniature cubes, also called "cubies" or "cubelets". Each of these includes a concealed inward extension that interlocks with the other cubes, while permitting them to move to different locations. However, the centre cube of each of the six faces is merely a single square façade; all six are affixed to the core mechanism. These provide structure for the other pieces to fit into and rotate around. So there are twenty-one pieces: a single core piece consisting of three intersecting axes holding the six centre squares in place but letting them rotate, and twenty smaller plastic pieces which fit into it to form the assembled puzzle.
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