<s>
Liberator	B-Application
is	O
an	O
arcade	O
game	O
released	O
by	O
Atari	O
,	O
Inc	O
.	O
in	O
1982	O
.	O
</s>
<s>
Liberator	B-Application
has	O
been	O
described	O
as	O
the	O
opposite	O
of	O
Missile	B-Application
Command	I-Application
,	O
in	O
that	O
the	O
player	O
destroys	O
cities	O
from	O
space	O
instead	O
of	O
defending	O
them	O
from	O
the	O
ground	O
.	O
</s>
<s>
The	O
story	O
"	O
Code	O
Name	O
:	O
Liberator	B-Application
"	O
describes	O
the	O
premise	O
of	O
the	O
arcade	O
game	O
in	O
detail	O
and	O
was	O
included	O
as	O
a	O
special	O
insert	O
in	O
two	O
comic	O
books	O
cover	O
dated	O
January	O
1983	O
.	O
</s>
<s>
The	O
Liberator	B-Application
controls	O
consist	O
of	O
a	O
trackball	B-Device
,	O
fire	O
button	O
,	O
and	O
shield	O
button	O
.	O
</s>
<s>
The	O
trackball	B-Device
is	O
used	O
to	O
move	O
a	O
cross-shaped	O
cursor	O
.	O
</s>
<s>
The	O
enemy	O
bases	O
can	O
also	O
detach	O
from	O
the	O
planet	O
,	O
turn	O
into	O
satellites	B-Application
,	O
and	O
orbit	O
the	O
planet	O
while	O
shooting	O
missiles	O
.	O
</s>
<s>
Flying	B-Language
saucers	I-Language
sometimes	O
appear	O
from	O
the	O
planet	O
.	O
</s>
<s>
Flying	B-Language
saucers	I-Language
shoot	O
a	O
large	O
,	O
deadly	O
laser	O
which	O
cannot	O
be	O
stopped	O
.	O
</s>
<s>
Liberator	B-Application
was	O
released	O
for	O
Microsoft	B-Application
Windows	I-Application
,	O
Xbox	B-Application
,	O
and	O
PlayStation	B-Device
2	I-Device
in	O
2003	O
as	O
part	O
of	O
Atari	B-Application
Anthology	I-Application
,	O
a	O
collection	O
of	O
Atari	O
arcade	O
and	O
2600	B-General_Concept
games	O
.	O
</s>
