Rubiks Cube. The world's best selling toy. As of January 2009, 350 million cubes have been sold worldwide. It is a 3x3x3 cube with 6 sides of 6 colours usually red, white, blue, yellow, green and orange (but now, there are tons of designs, cartoons, etc). It was invented on 1974 by Ernő Rubik but not until 1980, when the cube was licesed by Rubiks, and later, won he German Game of the Year special award for Best Puzzle that year also. This year, 3x3x3 Rubiks Cube (previously known as Magic Cube) will be celebrating its 30th anniversary.
There are few ways to solve the 3x3x3 Rubiks Cube. First, involves solving the Cube layer by layer, in which one layer (designated the top) is solved first, followed by the middle layer, and then the final and bottom layer. There is also ''centre first'' and etc. In 2008, Tomas Rokicki hypothesised that the number of moves needed to solve the Rubik's Cube, given an ideal algorithm, is 22 moves! The most common way to solve Rubiks Cube was developed by Jessica Fridrich, which is similar to layer-to layer method but include the use of algorithms (which I used myself to solve Rubiks cube, as this is probably the easiest method of it. haha.)
The current world record is held by Erik Akkersdjik, 7:08 seconds at the Czech Open 2008.
Tons of variations of Rubiks Cube were developed such as 7x7x7, 2x2x2, 5x5x5 etc. Rubiks cube can also be simulated using software to create impractical ones, such as 1000x1000x1000, 10000000x10000000x10000000, haha.
Thats all for now.
*source: Rubik's Cube page on Wikipedia.