<s>
is	O
a	O
scrolling	O
shooter	O
video	O
game	O
developed	O
by	O
Jaleco	O
for	O
the	O
Nintendo	B-Device
Game	I-Device
Boy	I-Device
in	O
1990	O
which	O
saw	O
a	O
release	O
in	O
North	O
America	O
and	O
Europe	O
one	O
year	O
later	O
in	O
1991	O
.	O
</s>
<s>
Battle	B-Application
Unit	I-Application
Zeoth	I-Application
takes	O
place	O
in	O
the	O
future	O
where	O
mankind	O
is	O
invaded	O
by	O
a	O
race	O
of	O
alien	O
robots	O
known	O
as	O
the	O
Grein	O
.	O
</s>
<s>
To	O
retaliate	O
,	O
Earth	O
's	O
military	O
has	O
deployed	O
a	O
mecha	O
known	O
as	O
Battle	B-Application
Unit	I-Application
Zeoth	I-Application
,	O
specializing	O
in	O
alien	O
combat	O
.	O
</s>
<s>
Players	O
receive	O
points	O
by	O
destroying	O
enemies	O
and	O
clearing	O
stages	O
which	O
contribute	O
to	O
their	O
score	O
,	O
but	O
the	O
high	O
score	O
is	O
not	O
saved	O
and	O
is	O
lost	O
when	O
the	O
Game	B-Device
Boy	I-Device
is	O
turned	O
off	O
.	O
</s>
<s>
This	O
game	O
was	O
released	O
in	O
Japan	O
under	O
the	O
name	O
"	O
Battle	B-Application
Unit	I-Application
Zeoth	I-Application
"	O
.	O
</s>
<s>
This	O
name	O
was	O
later	O
changed	O
back	O
to	O
"	O
Battle	B-Application
Unit	I-Application
Zeoth	I-Application
"	O
.	O
</s>
