<s>
is	O
a	O
third-person	O
shooter	O
video	O
game	O
for	O
iOS	B-Operating_System
developed	O
by	O
Kojima	O
Productions	O
and	O
published	O
by	O
Konami	O
worldwide	O
.	O
</s>
<s>
Announced	O
on	O
December	O
16	O
,	O
2008	O
,	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
Touch	I-Application
is	O
based	O
on	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
4	I-Application
:	I-Application
Guns	I-Application
of	I-Application
the	I-Application
Patriots	I-Application
.	O
</s>
<s>
It	O
was	O
released	O
on	O
the	O
App	B-Application
Store	I-Application
for	O
select	O
regions	O
on	O
March	O
18	O
,	O
2009	O
.	O
</s>
<s>
The	O
player	O
navigates	O
through	O
several	O
missions	O
based	O
on	O
stages	O
from	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
4	I-Application
,	O
each	O
introduced	O
by	O
brief	O
text	O
summarizing	O
the	O
story	O
so	O
far	O
.	O
</s>
<s>
The	O
player	O
plays	O
as	O
Solid	O
Snake	O
,	O
who	O
is	O
also	O
known	O
as	O
Old	O
Snake	O
in	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
4	I-Application
.	O
</s>
<s>
The	O
entirety	O
of	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
4	I-Application
has	O
been	O
streamlined	O
into	O
a	O
portable	O
and	O
more	O
accessible	O
form	O
.	O
</s>
<s>
Enemies	O
include	O
hostile	O
PMC	O
soldiers	O
,	O
Haven	B-Application
Troopers	I-Application
and	O
Gekkos	O
,	O
which	O
are	O
unmanned	O
fighting	O
machinations	O
.	O
</s>
<s>
Some	O
sections	O
contain	O
'	O
Boss	O
fights	O
 '	O
,	O
where	O
the	O
player	O
fights	O
a	O
boss	O
from	O
the	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
4	I-Application
storyline	O
;	O
e.g.	O
</s>
