<s>
Earth	B-Application
Defense	I-Application
Force	I-Application
is	O
a	O
1991	O
horizontal	O
scrolling	O
shooter	O
video	O
game	O
developed	O
and	O
published	O
by	O
Jaleco	O
.	O
</s>
<s>
Originally	O
an	O
arcade	O
game	O
,	O
the	O
game	O
was	O
later	O
released	O
for	O
the	O
Super	B-Application
Nintendo	I-Application
Entertainment	I-Application
System	I-Application
as	O
Super	B-Application
Earth	I-Application
Defense	I-Application
Force	I-Application
,	O
dropping	O
the	O
two-player	O
cooperative	O
gaming	O
mode	O
while	O
adding	O
graphics	O
and	O
selectable	O
weapons	O
.	O
</s>
<s>
The	O
SNES	B-Application
version	O
was	O
released	O
in	O
Japan	O
on	O
October	O
25	O
,	O
1991	O
,	O
and	O
in	O
North	O
America	O
in	O
January	O
1992	O
.	O
</s>
<s>
The	O
SNES	B-Application
version	O
was	O
eventually	O
released	O
on	O
the	B-Operating_System
Wii	I-Operating_System
Virtual	B-Application
Console	I-Application
in	O
Europe	O
on	O
October	O
29	O
,	O
2010	O
,	O
in	O
Japan	O
on	O
January	O
11	O
,	O
2011	O
,	O
and	O
in	O
North	O
America	O
on	O
July	O
14	O
,	O
2011	O
.	O
</s>
<s>
It	O
is	O
included	O
in	O
Nintendo	B-Application
Switch	I-Application
SNES	B-Application
Online	O
as	O
of	O
September	O
5	O
,	O
2019	O
.	O
</s>
<s>
Released	O
as	O
a	O
horizontal	O
shooter	O
game	O
in	O
the	O
US	O
in	O
1991	O
,	O
the	O
object	O
of	O
Earth	B-Application
Defense	I-Application
Force	I-Application
is	O
based	O
on	O
survival	O
of	O
the	O
game	O
's	O
levels	O
,	O
punctuated	O
by	O
the	O
defeat	O
of	O
bosses	O
at	O
the	O
end	O
of	O
each	O
one	O
.	O
</s>
<s>
Loss	O
of	O
all	O
shields	O
results	O
in	O
the	O
loss	O
of	O
one	O
of	O
three	O
credits	O
,	O
or	O
continues	O
,	O
and	O
loss	O
of	O
all	O
continues	O
results	O
in	O
the	O
player	O
seeing	O
the	O
game	B-Application
over	I-Application
screen	O
.	O
</s>
<s>
The	O
Earth	O
's	O
only	O
hope	O
lies	O
in	O
the	O
recently	O
developed	O
XA-1	O
and	O
2	O
space	O
fighter	O
ships	O
used	O
by	O
the	O
organization	O
known	O
as	O
E.D.F	O
:	O
Earth	B-Application
Defense	I-Application
Force	I-Application
.	O
</s>
<s>
In	O
the	O
Super	B-Application
NES	I-Application
version	O
,	O
the	O
Azyma	O
Empire	O
has	O
established	O
headquarters	O
on	O
the	O
dark	O
side	O
of	O
the	O
Moon	O
.	O
</s>
<s>
In	O
Japan	O
,	O
Game	O
Machine	O
listed	O
Earth	B-Application
Defense	I-Application
Force	I-Application
on	O
their	O
April	O
15	O
,	O
1991	O
issue	O
as	O
being	O
the	O
eleventh	O
most-successful	O
table	O
arcade	O
unit	O
of	O
the	O
month	O
.	O
</s>
<s>
Since	O
its	O
release	O
,	O
Earth	B-Application
Defense	I-Application
Force	I-Application
has	O
met	O
with	O
moderate	O
critical	O
reviews	O
,	O
as	O
evidenced	O
by	O
a	O
three	O
out	O
of	O
five	O
star	O
rating	O
by	O
Allgame	O
.	O
</s>
<s>
Subsequent	O
to	O
its	O
release	O
an	O
enhanced	O
version	O
was	O
broadcast	O
via	O
the	O
Super	B-Application
Famicom	I-Application
's	O
Satellaview	B-Device
subsystem	O
to	O
Japanese	O
gamers	O
under	O
the	O
title	O
BS	B-Application
Super	I-Application
Earth	I-Application
Defense	I-Application
Force	I-Application
.	O
</s>
