As commander of a helicopter gunship, you must destroy waves
of Spinad, Spore and Fusa before they reach earth and rear
attack. Your helicopter is firmly fixed left of screen, moving only
up (cursor 7) or down (6), firing missiles (0) and smart bombs (9),
green ground scrolling beneath you. Attacks come from above
by upside-down ice cream cones, from the right by white whirling
crosses, with occasional blue octopi dropping, out of range, to
earth. Score is shown at the top, with five unexplained graphics
marked "Pods", increasing and decreasing. Similar graphics
appear, already imbedded, as the ground scrolls on, and explode
upwards as they pass you.
Since the game's aim is to destroy
aliens before they reach earth, it seems a bit unsporting to let
them land off-screen. And, without rear missiles, your two smart
bombs are your only hope.
Mindless "zap aliens" games without originality or complexity,
difficult only for lack of manoeuvrability and off-screen or out
of range items, might have been acceptable once but program design
has moved on. When landing, aliens erase character squares in
supposedly solid mountains, a problem overcome by most novices.