No, not really - at least not for me (I'm 52yo) I think that the differences between the 4x4 and 5x5 are slight. It's one of those things where "if you can solve a 3x3 you can solve a 4x4 and if you can solve a 3x3 and a 4x4 you can solve a 5x5. The hardest part comes with the edges - there's some weird manuevers you have to do to get the edges right and oddly enough the 5x5 is easier on the edges than the 4x4 because the 5x5 has a center edge for each color and that makes it easier to get matches. It did for me anyway. But once I learned the 4x4, the 5x5 wasn't too hard to pick up.
On a 3x3 there are 9, 4x4 there are 16 and so on. Basically whatever number of squares on one row going across times that number.
http://www.cubelagoon.com/?ref=1285 Basically, you answer surveys to gain points and then use those points to claim prizes. Such as a rubiks cube. Its 100% free. I've gotten a 3x3 white cube and a 4x4 rubiks cube from here. Its very fast. For a 2x2 cube, its 4.75 points and each survey is around 0.5-2 points. So you can get it in no time. Just use that link and sign up and start answering surveys.
I bought mine off the rubik's cube website
The 4x4 rubik's cube or the Rubik's Revenge
i dont think you can
Thecubicle.us and several other websites (including Amazon) offer 4x4 Rubik's cubes.
you can get it on flipkart , rubiks.com or on ebay
there are actually six, the original 3x3 cube, the 30th anniversary wood cube, the ice cube(clear 2x2 cube), the plain 2x2 cube, the 4x4 cube, and last but not least the 5x5 cube.
The best choice is Rubik's. Don't get a knock-off. You can buy a reliable 4x4 Rubik's Cube online at the website in the sources and related links(below).
They cost about 10 dollars. Or completely free from http://www.cubelagoon.com/?ref=1285 Basically, you answer surveys to gain points and then use those points to claim prizes. Such as a rubiks cube. Its 100% free. I've gotten a 3x3 white cube and a 4x4 rubiks cube from here. Its very fast.
Why are you even thinking to ask that question?
This skills that someone has to solve a Rubik's cube can be used on any size Rubik's cube, whether it be a 2x2 or a 5x5.