<s>
A	O
spin-off	O
of	O
the	O
long	O
running	O
Gradius	B-Application
series	O
,	O
the	O
title	O
retains	O
most	O
of	O
the	O
gameplay	O
characteristics	O
of	O
its	O
2D	O
counterparts	O
including	O
the	O
same	O
powerups	O
and	O
display	O
system	O
.	O
</s>
<s>
Solar	B-Application
Assault	I-Application
is	O
similar	O
to	O
other	O
rail-shooters	O
like	O
Star	B-Application
Fox	I-Application
and	O
Galaxy	B-Application
Force	I-Application
,	O
where	O
the	O
player	O
must	O
move	O
both	O
horizontally	O
and	O
vertically	O
.	O
</s>
<s>
Like	O
the	O
other	O
games	O
in	O
the	O
Gradius	B-Application
series	O
,	O
there	O
is	O
no	O
health	O
bar	O
,	O
meaning	O
one	O
hit	O
ends	O
up	O
in	O
death	O
;	O
however	O
,	O
this	O
time	O
the	O
player	O
may	O
be	O
able	O
to	O
collect	O
a	O
"	O
shield	O
"	O
power	O
up	O
which	O
can	O
take	O
one	O
hit	O
or	O
two	O
hits	O
before	O
the	O
ship	O
's	O
destruction	O
.	O
</s>
<s>
Solar	B-Application
Assault	I-Application
Revised	I-Application
is	O
an	O
updated	O
version	O
of	O
Solar	B-Application
Assault	I-Application
released	O
later	O
in	O
1997	O
,	O
and	O
introduced	O
a	O
new	O
arcade	O
board	O
that	O
was	O
co-developed	O
by	O
Konami	O
and	O
IBM	O
which	O
allows	O
five	O
boards	O
to	O
be	O
stacked	O
on	O
top	O
of	O
each	O
other	O
,	O
as	O
well	O
as	O
several	O
modifications	O
to	O
the	O
game	O
,	O
like	O
the	O
all-new	O
level	O
"	O
Fierce	O
Blaze	O
"	O
,	O
new	O
attacks	O
to	O
the	O
"	O
Speed	O
Demon	O
"	O
level	O
boss	O
and	O
a	O
total	O
revamp	O
on	O
the	O
"	O
Abyssal	O
Forest	O
"	O
level	O
,	O
with	O
a	O
new	O
color	O
palette	O
and	O
some	O
new	O
enemies	O
,	O
making	O
it	O
much	O
harder	O
than	O
the	O
original	O
.	O
</s>
<s>
The	O
US	O
version	O
of	O
the	O
game	O
was	O
based	O
on	O
this	O
one	O
,	O
just	O
simply	O
renamed	O
as	O
"	O
Solar	B-Application
Assault	I-Application
"	O
.	O
</s>
