In the 2nd step we are going to pair them up together. Multiple edge pieces: every edge piece in the 4x4 cube has an identical edge piece around the cube, meaning there are 2 edge pieces of every type (e.g. (In the image: example of a solved red center block) For 4 center pieces solved together we call a center block. As mentioned, there are 4 center pieces for each color. That means we cannot determine the cube color-scheme by looking at the center pieces (we'll use memory, or corner pieces). No fixed Center pieces: There are no fixed center pieces in the 4x4 cube, meaning these center pieces can move around the cube, and replace places with each other (unlike the 3x3 where yellow will always remain opposite to white, for example). There is no single center piece, but 4 center pieces per color therefore they are not fixed in their positions. The 4x4 mechanics is a bit different from the classic 3x3 Rubik's cube.
