The Magna Cuba is a puzzle cube made up of 4x4x4 (64)
smaller cubes. Each face has one of 8 different colours.
Up to 3 faces on each cube also has a small magnet (either
+ or -) just beneath the surface. The trick is to assemble
all the small cubes to make one big cube with with
matching
colours on the outer faces (much like a Rubiks
cube) As there are 8 different colours you have to choose
which ones you want to complete.
Very tricky to squeeze that last cube in place only to find
the polarity is wrong!