<s>
Astro	B-Application
Fighter	I-Application
consists	O
of	O
4	O
waves	O
and	O
a	O
refueling	O
stage	O
,	O
which	O
are	O
then	O
repeated	O
with	O
increasingly	O
higher	O
difficulty	O
.	O
</s>
<s>
The	O
player	O
's	O
task	O
is	O
to	O
eliminate	O
the	O
four	O
successive	O
waves	O
of	O
different	O
types	O
of	O
attacking	O
craft	O
,	O
while	O
avoiding	O
being	O
hit	O
by	O
missiles	O
and	O
bombs	B-Device
,	O
and	O
then	O
refuel	O
by	O
shooting	O
the	O
'	O
GS	O
 '	O
ship	O
before	O
repeating	O
the	O
process	O
.	O
</s>
<s>
300	O
bonus	O
points	O
are	O
received	O
for	O
shooting	O
each	O
6	O
falling	O
bombs	B-Device
and	O
for	O
950	O
for	O
hitting	O
the	O
GS	O
ship	O
accurately	O
on	O
the	O
first	O
shot	O
.	O
</s>
<s>
In	O
North	O
America	O
,	O
it	O
was	O
the	O
fourth	O
top-grossing	O
video	O
game	O
on	O
the	O
Play	O
Meter	O
arcade	B-Application
charts	O
from	O
September	O
to	O
October	O
1980	O
.	O
</s>
