Layer by Layer

The Layer by Layer Method was pioneered by David Singmaster in his 1980 book Notes on Rubik's "Magic Cube".[1][2] The same idea was adopted by James G. Nourse in his The Simple Solution to Rubik's Cube which became the bestselling book of 1981,[3] and similar approaches could be found in Don Taylor's Mastering Rubik's Cube and Cyril Östrop's Solving the Cube from the same era.[4]

The method begins with the puzzle solver making a cross on one face with the edge pieces ensuring that all edge colours match the adjacent center colours (step 1 in the diagram below), then putting the corners into position between the edges (step 2). By then, the layer should be solved. In step 3, the four edge pieces of the middle layer are solved. At this point the first two layers are solved. In step 4, a cross of the opposite color is made on the last layer. For step 5, the last layer edges are permutated (swapped around). In step 6, the last layer corners are permutated. Finally, the last layer corners are oriented.[5]

An overview of the layer by layer method for Rubik's Cube. The cube has been turned over in the third step.

Most Layer by Layer beginners' methods solve the first two layers using the same technique. However, there are many variant techniques for the final layer, depending on whether the corner or edge pieces are solved first.[4] For example:

1. Top layer "white cross": F' U L' U' or F R U R' U' F'
2. Top layer left corner: D L D' L’ / right corner: D' R' D R
3. Middle layer right edge: U R U' R' U' F' U F / Left edge: U' L' U L U F U' F'
4. Final layer edges: R U R' U R U U R'
5. Final layer corners: U R U' L' U R' U' L
6. Finishing the cube: R' D' R D

The CFOP speedcubing technique, developed by Jessica Fridrich and others in the 1980s, similarly divides the puzzle into layers to be solved. However the method uses far more algorithms and shortcuts than the beginners' methods.[6]