4x4 parity occurs on the last layer of a 4x4, where you get a case that is impossible to get on a 3x3 so you need a specific algorithm to solve it.  PLL parity specifically occurs because two adjacent edge pieces are swapped diagonally with 2 other adjacent edge pieces.  Generally you can't recognize it until you are at the PLL stage of solving.

PLL Parity case 1:

This swaps the 2 edges opposite each other.

Perform the algorithm with Yellow on top.

r2, U2, r2, Uw2, r2, u2

PLL Parity case 2:

This swaps the 2 edges adjacent each other. Perform the algorithm with Yellow on top.

(R' U R U' ) r2, U2, r2, Uw2, r2, u2, (U R' U' R )

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 Rw BOTH Right Layers r INNER Right Layer Uw BOTH Top Layers u INNER Top Layer X Turn the cube clockwise around the X-Axis X' Turn the cube anti-clockwise around the X-axis

Vivaan

These algs lower my times

Daksh

I already know how to solve parity but this alg is much easier .

B-cuber

Wdym? Algorithm 2 works perfectly fine

Samuel

I dont really understand what to do in some cases. Like on case 2 of PLL parity i got confused. My point is, could u make it more clear please?

Micah Bohon

This is so helpful. Thanks so much.

djhy

parity case 2 doesn’t work

cuber

Really cool algorythms. Now i know how to solve parity without a resolve :)

K

which way should the cube face for this ?