4x4x4 Master Cube Step 3

You have solved the centers and paired up the edges. Now, pretend that the two middle layers of each side are locked together (for example, treat l and r as one solid slice). If you do this, then the 4x4x4 Master Cube behaves just like the 3x3x3 Rubiks Cube, and you can Solve That. After doing that, everything should be solved except for perhaps a few wayward edges and corners. That can be solved with special moves 1, 2 and 3.

Onward to Special Move 1