You have the task of defending a nuclear reactor from invading
'droids, by operating a laser, which you can move up and down
a column in the centre of the screen.
There are various platforms up each side of the screen, off which
the 'droids parachute, falling to the bottom of the screen, where
they are whipped round a circuit in the reactor, to be transmuted
into flying plus signs which float up and down, shooting at your
laser base. If you can shoot the droids while they are in the
parachute stage of their metamorphosis, this is desirable, since
it prevents them from turning into nasty plus signs.
Selectable difficulty and hall of fame are included, as are multi-wave
attacks. However, I could not find any user-definable keys as
promised by the cassette inset and I was a little disappointed to
find each new wave attack was much the same as the one before.
On the plus side, good use was made of colour and sound, and the
game balance of progress versus defeat was about right. The plot is
also fairly original.