A perfect magic cube is a Magic Cube for which the cross-section diagonals, as well as the space diagonals, sum to the Magic Constant.

**References**

Gardner, M. ``Magic Squares and Cubes.'' Ch. 17 in *Time Travel and Other Mathematical Bewilderments.*
New York: W. H. Freeman, pp. 213-225, 1988.

© 1996-9

1999-05-26