This is two games; tetris on a sane, cubical 3-d lattice, and tetris on
a close-packed 3-d lattice of spheres.

The code of the two games is similar enough that any porting changes you
make to one will probably be applicable to the other.

If you grabbed the beta version of these games from my account, note the
following changes: the "sqrt domain error" has been fixed, and spatial
is now in color. (Unfortunately, due to X's peculiar ideas, spheral
cannot be displayed correctly in color. If you manage to hack this to
work, please let me know.)

--Z
