Rw2 B2 U2 Lw U2 Rw' U2 Rw U2 F2 Rw F2 Lw' B2 Rw2 (Note: 'w' means turning the two outer layers together). 2. PLL Parity

You must build the six 2×2 center blocks. A good PDF will show you the basic commutator:

The worst time to learn that x means "rotate the entire cube" is mid-solve. A good PDF starts with a legend:

The standard approach taught in every high-quality is the Reduction Method . You reduce the 4×4 into a virtual 3×3, solve it, then fix the inevitable parities.

Print this page. Congratulations—you have just created your own custom .

No single formula – intuitive pairing. But to swap two center pieces: