4x4x4 Master Cube Step 1

This step is designed to get all the middle pieces paired up with their partners and in the right places.

rf'r'Frfr'F'

This move will rotate these 3 pieces. You'll have to use this move a bunch. To set up for this move, you'll have to rotate the L,R,B,U,D,F faces to get the center pieces in the correct place to do the swap.

Onward to Step 2