The 3x3 method IS applied on the 9x9, just in a later stage of the solving process.
Mainly it starts with forming all the centers, then you solve all the edges, and then solve it as a large looking 3x3 cube, if you look up what the Reduction method is, you'll see what I am trying to say from there
you'll basically need to know a few base concepts to start tackling big cubes like the 9x9:
know how to solve the 3x3
know how to solve the 4x4
from there the rest is kinda intuitive if you just follow your instinct based on the founding knowlege bases of 3x3 and 4x4... your only issue then is solving parity which, you'll most likely figure it out if you solve 4x4 already
The 3x3 method IS applied on the 9x9, just in a later stage of the solving process.
Mainly it starts with forming all the centers, then you solve all the edges, and then solve it as a large looking 3x3 cube, if you look up what the Reduction method is, you'll see what I am trying to say from there
you'll basically need to know a few base concepts to start tackling big cubes like the 9x9:
know how to solve the 3x3
know how to solve the 4x4
from there the rest is kinda intuitive if you just follow your instinct based on the founding knowlege bases of 3x3 and 4x4... your only issue then is solving parity which, you'll most likely figure it out if you solve 4x4 already