How to solve a Rubik's cube 6x6 - Step 4

At the beginning of this of the stage You should have the the top cross assembled.

At the end of the stage, you should have the entire upper face assembled.

Apply the formulas of the second step second step of assembling a 3x3 cube. We assemble the upper face. Find one of the corner cubes of the upper face, and place it on the lower face. Now, depending on how the colors of this cube stand up, do the operation shown below.

Variant 1

Variant 2

Variant 3

Repeat the operation with the remaining three corner cubes of the top face.