Problem solving 4x4

[Nick A]

So I got my first 4x4 today, I solved the first 3 layers and as I'm trying to solve the cross on top (like a 3x3) It just won't make a cross.

What am I doing wrong? I'm using the same algorithm as I use when I solve 3x3...

 

[iSpinz]

It's called parity. Use this alg with the incorrect edge pair in front of you.
r2 B2 U2 l U2 r' U2 r U2 F2 r F2 l' B2 r2

For adjacent center switch:
u2 l2 U2 l2 L2 U2 l2 u2

For switching two corners on PLL, do a T-perm and then the adjacent center switch or vise/versa.

 

[T3hKyng]

Haha. Yeah thats OLL parity. There is a second one the PLL parity.
Its when two edges are switched on PLL. r2 U2 r2 (Uu)2 r2 u2

 

[James Ludlow]

So I got my first 4x4 today, I solved the first 4 layers

Man, it took me 2 weeks on my own to get this far!

(Sorry Stefan!)

 

[Nick A]

So I got my first 4x4 today, I solved the first 4 layers

Man, it took me 2 weeks on my own to get this far!

(Sorry Stefan!)

I'm determined .

 

[JTW2007]

So I got my first 4x4 today, I solved the first 4 layers

Man, it took me 2 weeks on my own to get this far!

(Sorry Stefan!)

I'm determined .

I think he was pointing out the fact that if you solve the "first 4 layers" of a 4x4, the cube is solved, which yours clearly isn't.

 

[Nick A]

So I got my first 4x4 today, I solved the first 4 layers

Man, it took me 2 weeks on my own to get this far!

(Sorry Stefan!)

I'm determined .

I think he was pointing out the fact that if you solve the "first 4 layers" of a 4x4, the cube is solved, which yours clearly isn't.

3 layers*