Variants of Magic/Rubik's Cubes

We must have come across the famous cube puzzle in our childhood. It was first created by a Hungarian Scientist, Rubik. Hence, the name Rubik's Cube. Solving a 3x3 cube itself demads more IQ. But did you know there are several other versions of it and they require varying degrees of IQ? Here are some pictures of 'em. There are much more and can be created logically. Thank You... Cheers...