Rules to play Rubiks Cube
"When describing the solution for the 2nd and 3rd layers, standard cube notation will be used. Heres what you need to know to read it
F = front face
B = back face
R = right face
L = left face
U = up face
D = down face
In addition to a letter, each move may be accompanied by an apostrophe or the number two
A letter by itself means turn that face 90 degrees clockwise (eg. F).
A letter followed by an apostrophe means turn that face 90 degrees anticlockwise (eg. F).
A letter followed by the number 2 means turn that face 180 degrees (direction is irrelevant), (eg. F2).
So R U L2 is shorthand for ""turn the right face 90 degrees clockwise, then turn the up face 90 degrees anticlockwise, then turn the left face 180 degrees"". When thinking whether to turn clockwise/anticlockwise, imagine that you are looking directly at the particular face you are turning. "