<s>
D-Force	B-Application
,	O
known	O
in	O
Japan	O
as	O
,	O
is	O
a	O
1991	B-Application
vertical	O
scrolling	O
shooter	O
video	O
game	O
developed	O
and	O
published	O
in	O
Japan	O
by	O
Asmik	O
for	O
the	O
Super	B-Application
Famicom	I-Application
and	O
later	O
localized	O
and	O
published	O
in	O
North	O
America	O
by	O
Asmik	O
Corporation	O
of	O
America	O
for	O
the	O
Super	B-Application
NES	I-Application
.	O
</s>
<s>
Some	O
of	O
the	O
levels	O
involve	O
switching	O
altitudes	O
in	O
order	O
to	O
attack	O
enemies	O
from	O
a	O
different	O
height	O
,	O
which	O
uses	O
Mode	O
7	O
,	O
one	O
of	O
the	O
main	O
features	O
of	O
the	O
Super	B-Application
NES	I-Application
.	O
</s>
