With its bright color design, plus the fact that it transcends languages and ages and backgrounds and doesn't even require instructions, it is perhaps not surprising that the Rubik's cube became the best selling global phenomena. Not to mention that it's portable and can be solved in countless ways. But initially, Erno Rubik did not realize that he had on his hands something that was going to be ingenious and confounding of people, especially with that whole color matching example puzzle