Who became one of the richest men in Hungary thanks to a toy he developed?

Erno Rubik became one of the richest men in Hungary thanks to the toy that he developed, the Rubik’s cube. 

He developed the Rubik’s cube in 1974 and since has sold over 350 million. 

The Rubik’s cube is a puzzle covered in colored squares, the objective of the game is to twist the 3D puzzle to make it so that all the squares on each side are the same color. 

Here is a video showing you how to complete a Rubik’s cube.