Simple magic cube

A simple magic cube is the lowest of six basic classes of magic cubes.

These classes are based on extra features required.

The simple magic cube requires only the basic features a cube requires to be magic.

Namely, all lines parallel to the faces, and all 4 space diagonals sum correctly.

[1] i.e. all "1-agonals" and all "3-agonals" sum to No planar diagonals (2-agonals) are required to sum correctly, so there are probably no magic squares in the cube.