For a more detailed explanation of this step with animated examples read about the orientation of last layer corners here. Unlike the original 3x3 cube the 4x4x has no fixed centre pieces and so it is even harder to solve. The New Rubiks Speed Cube Engineered for Speed With Magnets.
F means turn that face 90 degrees clockwise with respect to the center of the cube.
The 98-piece 5x5x5 Rubiks cube also known as the Professors Cube is a great challenge if youve already solved the regular 3x3x3 cube or the 4x4x4 puzzleWhile this puzzle is tricky it can be solved as long as you carefully follow an algorithm known as the reduction method. First you solve one face of the cube first layer then the. R D R Dx2 U R D R Dx4. U Outer up face anticlockwise.