The Rubik's Cube is a three-dimensional puzzle in which each side composed of six different colors is divided into 9 squares of 3x3, and it is so popular that the world championships are held. ' Rubik ...

Some toys never go out of fashion. Celebrating its 50th anniversary this year, Rubik’s continues to be the most popular puzzle cube brand in the world, with around 500 million sold, according to Yahoo ...