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Rubik's Cube transparency

The Rubik's Cube (also known as the 3x3x3 cube, and normally referred to in the cubing community as the 3x3x3 or 3x3) is a twistable puzzle in the shape of a cube that is cut two times along each of three axes.

☀The Rubik's Cube remains the top-selling single toy of all time with 350 million sold since 1980. The Rubik's Cube remains so popular that in the decades since its creation, it has spawned entire speed-cubing competitions. The toy still has a large fan base, among young and old. One developer even created an iPhone application that instructs users how to solve a Rubik's Cube in 20 moves. Unlike other best-selling toys, such as Monopoly and the Gumby Doll, the cube was not originally intended to be a toy. Its inventor, Hungarian architecture professor Erno Rubik, created it in 1974 as a way to teach his students three-dimensional geometry. The combined collections of Mattel's Barbie dolls and Hot Wheels have both outsold the Rubik's Cube, but none of them have as a single toy.

This puzzle has 6 fixed centers, 12 edges, and 8 corners, and a total of 43,252,003,274,489,856,000 (or 4.3 x 10^19) positions. It has been proven that every position can be solved in 20 or fewer moves.

The current official world record single is 3.47 seconds by Yusheng Du, and the world record average of 5 is 5.54 seconds by Feliks Zemdegs.