<s>
It	O
is	O
the	O
seventh	O
Metal	B-Application
Gear	I-Application
game	O
written	O
,	O
directed	O
,	O
and	O
designed	O
by	O
Hideo	O
Kojima	O
,	O
and	O
the	O
fifth	O
installment	O
of	O
the	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
series	I-Application
,	O
as	O
well	O
as	O
the	O
fourth	O
Metal	B-Application
Gear	I-Application
game	O
made	O
specifically	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
,	O
following	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
:	I-Application
Portable	I-Application
Ops	I-Application
.	O
</s>
<s>
The	O
game	O
was	O
later	O
released	O
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
as	O
part	O
of	O
the	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
HD	I-Application
Collection	I-Application
in	O
North	O
America	O
and	O
Europe	O
and	O
as	O
a	O
stand-alone	O
retail	O
release	O
in	O
Japan	O
.	O
</s>
<s>
Peace	B-Application
Walker	I-Application
is	O
set	O
in	O
Costa	O
Rica	O
in	O
1974	O
,	O
and	O
follows	O
the	O
exploits	O
of	O
returning	O
protagonist	O
Snake	O
as	O
he	O
runs	O
the	O
mercenary	O
unit	O
Militaires	O
Sans	O
Frontières	O
(	O
Soldiers	B-Application
Without	I-Application
Borders	I-Application
)	O
.	O
</s>
<s>
The	O
game	O
received	O
critical	O
acclaim	O
,	O
but	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
version	O
failed	O
to	O
match	O
the	O
commercial	O
success	O
of	O
its	O
console	O
predecessors	O
due	O
to	O
declining	O
support	O
for	O
the	O
system	O
.	O
</s>
<s>
Peace	B-Application
Walker	I-Application
consists	O
of	O
two	O
primary	O
gameplay	O
modes	O
:	O
"	O
Mission	O
"	O
and	O
"	O
Mother	O
Base	O
"	O
.	O
</s>
<s>
"	O
Mission	O
"	O
are	O
the	O
actual	O
action	O
sequences	O
of	O
the	O
game	O
,	O
where	O
the	O
player	O
must	O
infiltrate	O
an	O
enemy	O
territory	O
or	O
fight	O
a	O
boss	O
,	O
whereas	O
"	O
Mother	O
Base	O
"	O
is	O
an	O
army	O
management	O
mode	O
similar	O
to	O
the	O
briefing	O
screen	O
in	O
Portable	B-Application
Ops	I-Application
.	O
</s>
<s>
The	O
game	O
adopts	O
certain	O
play	O
mechanics	O
from	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
4	I-Application
,	O
such	O
as	O
the	O
crouching	O
walk	O
,	O
the	O
over-the-shoulder	O
shooting	O
view	O
,	O
the	O
CQC	O
system	O
,	O
and	O
the	O
ability	O
to	O
search	O
held-up	O
soldiers	O
.	O
</s>
<s>
The	O
truck	O
from	O
Portable	B-Application
Ops	I-Application
,	O
where	O
players	O
can	O
bring	O
subdued	O
enemies	O
for	O
recruitment	O
,	O
has	O
been	O
discarded	O
in	O
favor	O
of	O
the	O
Fulton	O
Recovery	O
System	O
,	O
which	O
players	O
attach	O
to	O
subdued	O
soldiers	O
and	O
prisoners	O
.	O
</s>
<s>
The	O
Wi-Fi	O
recruitment	O
system	O
from	O
Portable	B-Application
Ops	I-Application
has	O
been	O
modified	O
so	O
that	O
instead	O
of	O
tapping	O
the	O
Circle	O
button	O
to	O
obtain	O
a	O
strong	O
enough	O
signal	O
from	O
an	O
access	O
point	O
,	O
the	O
player	O
will	O
have	O
to	O
knock	O
out	O
soldiers	O
using	O
CQC	O
to	O
accept	O
them	O
.	O
</s>
<s>
The	O
Surround	O
Indicator	O
in	O
Portable	B-Application
Ops	I-Application
can	O
also	O
be	O
used	O
only	O
when	O
it	O
is	O
equipped	O
in	O
the	O
item	O
box	O
and	O
players	O
will	O
also	O
develop	O
and	O
use	O
an	O
early	O
version	O
of	O
the	O
Soliton	O
radar	O
system	O
from	O
the	O
original	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
.	O
</s>
<s>
The	O
player	O
can	O
also	O
use	O
marking	O
devices	O
to	O
call	O
in	O
artillery	B-Application
strikes	O
or	O
resupply	O
drops	O
.	O
</s>
<s>
The	O
player	O
can	O
set	O
the	O
control	O
system	O
according	O
to	O
that	O
of	O
Portable	B-Application
Ops	I-Application
,	O
Guns	B-Application
of	I-Application
the	I-Application
Patriots	I-Application
,	O
or	O
Capcom	O
's	O
Monster	B-Application
Hunter	I-Application
series	O
.	O
</s>
<s>
Sneaking	B-Application
Suit	I-Application
–	O
Resembling	O
the	O
sneaking	B-Application
suit	I-Application
worn	O
by	O
Solid	O
Snake	O
in	O
previous	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
games	I-Application
,	O
it	O
allows	O
players	O
to	O
move	O
without	O
generating	O
foot	O
noise	O
and	O
have	O
higher	O
camouflage	O
compared	O
to	O
other	O
suits	O
while	O
moving	O
,	O
but	O
restricts	O
them	O
to	O
five	O
items	O
and	O
six	O
secondary	O
weapons	O
.	O
</s>
<s>
The	O
design	O
of	O
the	O
Sneaking	B-Application
Suit	I-Application
worn	O
by	O
MSF	O
soldiers	O
differs	O
slightly	O
from	O
Snake	O
's	O
version	O
.	O
</s>
<s>
Other	O
outfits	O
are	O
also	O
available	O
,	O
such	O
as	O
t-shirts	O
in	O
various	O
designs	O
,	O
swimsuits	O
,	O
a	O
tuxedo	B-Application
and	O
outfits	O
inspired	O
by	O
the	O
wardrobe	O
of	O
supporting	O
characters	O
.	O
</s>
<s>
Aside	O
from	O
managing	O
the	O
combat	O
,	O
medical	O
,	O
intelligence	O
,	O
and	O
technology	O
research	O
teams	O
seen	O
in	O
Portable	B-Application
Ops	I-Application
,	O
the	O
player	O
can	O
assign	O
personnel	O
to	O
the	O
mess	O
hall	O
crew	O
to	O
feed	O
the	O
troops	O
and	O
keep	O
up	O
their	O
morale	O
.	O
</s>
<s>
During	O
the	O
course	O
of	O
the	O
game	O
,	O
the	O
player	O
will	O
fight	O
advanced	O
AI-controlled	O
vehicles	O
,	O
code-named	O
PUPA	O
,	O
CHRYSALIS	O
,	O
COCOON	O
,	O
and	O
the	O
titular	O
Peace	B-Application
Walker	I-Application
.	O
</s>
<s>
Depending	O
on	O
the	O
player	O
's	O
strategy	O
in	O
defeating	O
these	O
bosses	O
,	O
vehicle	O
parts	O
and	O
AI	O
boards	O
can	O
be	O
harvested	O
and	O
used	O
to	O
build	O
Metal	B-Application
Gear	I-Application
ZEKE	O
,	O
a	O
bipedal	O
mech	O
designed	O
by	O
Dr.	O
Emmerich	O
for	O
MSF	O
to	O
protect	O
the	O
organization	O
from	O
foreign	O
aggression	O
.	O
</s>
<s>
The	O
in-game	O
cutscenes	O
come	O
in	O
two	O
different	O
varieties	O
:	O
3D	O
sequences	O
rendered	O
using	O
the	O
game	O
engine	O
,	O
and	O
2D	O
motion	O
comic	O
sequences	O
utilizing	O
an	O
illustration	O
style	O
similar	O
to	O
those	O
featured	O
in	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
:	O
Digital	O
Graphic	O
Novel	O
and	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
:	I-Application
Portable	I-Application
Ops	I-Application
.	O
</s>
<s>
The	O
3D-rendered	O
cutscenes	O
are	O
available	O
with	O
either	O
text-only	O
narration	O
,	O
or	O
with	O
the	O
inclusion	O
of	O
voice	O
acting	O
—	O
the	O
latter	O
requires	O
the	O
decompression	O
and	O
installation	O
of	O
audio	O
data	O
to	O
the	O
PSP	B-Operating_System
storage	O
media	O
,	O
to	O
permit	O
simultaneous	O
audio	O
playback	O
and	O
game	O
rendering	O
without	O
real-time	O
decompression	O
overhead	O
;	O
this	O
feature	O
also	O
permits	O
voiced	O
radio	O
calls	O
during	O
missions	O
.	O
</s>
<s>
Peace	B-Application
Walker	I-Application
begins	O
on	O
November	O
4	O
,	O
1974	O
.	O
</s>
<s>
Big	O
Boss	O
is	O
running	O
his	O
own	O
mercenary	O
unit	O
in	O
Colombia	O
after	O
leaving	O
the	O
United	O
States	O
,	O
following	O
the	O
death	O
of	O
The	O
Boss	O
during	O
Operation	B-Application
Snake	I-Application
Eater	I-Application
ten	O
years	O
prior	O
.	O
</s>
<s>
Dr.	O
Strangelove	O
(	O
Vanessa	O
Marshall/Yumi	O
Kikuchi	O
)	O
is	O
a	O
British	O
AI	O
expert	O
whom	O
Coldman	O
hired	O
to	O
work	O
on	O
the	O
Peace	B-Application
Walker	I-Application
Project	O
and	O
is	O
later	O
attracted	O
to	O
Huey	O
.	O
</s>
<s>
The	O
game	O
also	O
features	O
flashback	O
scenes	O
from	O
MGS3	B-Application
,	O
particularly	O
the	O
final	O
battle	O
between	O
Snake	O
and	O
The	O
Boss	O
,	O
plus	O
the	O
audiotape	O
that	O
EVA	O
(	O
Suzetta	O
Miñet/Misa	O
Watanabe	O
)	O
left	O
behind	O
after	O
Operation	B-Application
Snake	I-Application
Eater	I-Application
.	O
</s>
<s>
Trenya	O
from	O
Capcom	O
's	O
Monster	B-Application
Hunter	I-Application
series	O
also	O
appears	O
as	O
Snake	O
's	O
transporter	O
to	O
a	O
mythical	O
island	O
,	O
where	O
he	O
can	O
battle	O
the	O
Rathalos	O
and	O
Tigrex	O
monsters	O
from	O
the	O
same	O
series	O
.	O
</s>
<s>
Four	O
years	O
after	O
the	O
events	O
of	O
the	O
San	B-Application
Hieronymo	I-Application
incident	I-Application
,	O
Big	O
Boss	O
—	O
who	O
prefers	O
his	O
original	O
codename	O
,	O
Snake	O
—	O
and	O
Kaz	O
Miller	O
have	O
established	O
Militaires	O
Sans	O
Frontières	O
,	O
a	O
small	O
mercenary	O
faction	O
,	O
on	O
the	O
Colombian	O
coast	O
.	O
</s>
<s>
His	O
suspicions	O
are	O
confirmed	O
when	O
he	O
witnesses	O
Hot	O
Coldman	O
,	O
a	O
senior	O
CIA	O
agent	O
,	O
announce	O
his	O
intentions	O
to	O
fire	O
a	O
live	O
nuclear	O
weapon	O
as	O
part	O
of	O
a	O
project	O
code-named	O
"	O
Peace	B-Application
Walker	I-Application
"	O
,	O
a	O
fail-deadly	O
nuclear	O
tank	O
.	O
</s>
<s>
Snake	O
reveals	O
himself	O
to	O
Huey	O
Emmerich	O
,	O
one	O
of	O
Peace	B-Application
Walker	I-Application
's	O
designers	O
,	O
who	O
agrees	O
to	O
help	O
him	O
stop	O
Coldman	O
.	O
</s>
<s>
Following	O
Huey	O
's	O
instructions	O
,	O
Snake	O
ventures	O
deeper	O
into	O
Costa	O
Rica	O
,	O
searching	O
for	O
Dr.	O
Strangelove	O
,	O
the	O
designer	O
of	O
Peace	B-Application
Walker	I-Application
's	O
artificial	O
intelligence	O
systems	O
.	O
</s>
<s>
He	O
discovers	O
that	O
Strangelove	O
has	O
based	O
Peace	B-Application
Walker	I-Application
's	O
primary	O
control	O
systems	O
on	O
The	O
Boss	O
 '	O
personality	O
.	O
</s>
<s>
Snake	O
escapes	O
custody	O
and	O
attempts	O
in	O
vain	O
to	O
destroy	O
Peace	B-Application
Walker	I-Application
,	O
a	O
quadrupedal	O
nuclear	O
launch	O
platform	O
.	O
</s>
<s>
He	O
chases	O
Peace	B-Application
Walker	I-Application
across	O
the	O
Nicaraguan	O
border	O
to	O
an	O
American	O
airbase	O
on	O
the	O
shores	O
of	O
Lake	O
Cocibolca	O
.	O
</s>
<s>
Coldman	O
reveals	O
the	O
purpose	O
of	O
Peace	B-Application
Walker	I-Application
:	O
he	O
believes	O
that	O
nuclear	O
deterrence	O
is	O
a	O
flawed	O
theory	O
,	O
relying	O
on	O
humans	O
to	O
retaliate	O
in	O
the	O
event	O
of	O
a	O
nuclear	O
exchange	O
,	O
whom	O
he	O
believes	O
to	O
be	O
unwilling	O
to	O
destroy	O
their	O
own	O
race	O
.	O
</s>
<s>
As	O
an	O
impartial	O
artificial	O
intelligence	O
,	O
Peace	B-Application
Walker	I-Application
would	O
guarantee	O
retaliation	O
,	O
and	O
Coldman	O
intends	O
to	O
fire	O
a	O
warhead	O
to	O
prove	O
it	O
.	O
</s>
<s>
Zadornov	O
intends	O
to	O
hijack	O
Peace	B-Application
Walker	I-Application
for	O
the	O
Soviet	O
Union	O
,	O
but	O
the	O
standoff	O
is	O
broken	O
by	O
the	O
arrival	O
of	O
MSF	O
and	O
the	O
Sandinistas	O
,	O
giving	O
Snake	O
enough	O
time	O
to	O
destroy	O
Peace	B-Application
Walker	I-Application
.	O
</s>
<s>
In	O
his	O
dying	O
moments	O
,	O
Coldman	O
activates	O
Peace	B-Application
Walker	I-Application
's	O
data	O
uplink	O
,	O
convincing	O
NORAD	O
that	O
the	O
United	O
States	O
is	O
about	O
to	O
be	O
hit	O
by	O
a	O
Soviet	O
nuclear	O
strike	O
.	O
</s>
<s>
With	O
a	O
nuclear	O
strike	O
imminent	O
,	O
The	O
Boss	O
 '	O
personality	O
takes	O
control	O
of	O
Peace	B-Application
Walker	I-Application
's	O
damaged	O
artificial	O
intelligence	O
and	O
drowns	O
Peace	B-Application
Walker	I-Application
in	O
Lake	O
Cocibolca	O
,	O
severing	O
the	O
connection	O
and	O
ending	O
the	O
threat	O
.	O
</s>
<s>
Paz	O
reveals	O
herself	O
to	O
be	O
the	O
traitor	O
,	O
using	O
Zadornov	O
's	O
escapes	O
to	O
seize	O
control	O
of	O
Metal	B-Application
Gear	I-Application
ZEKE	O
,	O
a	O
walking	O
tank	O
designed	O
by	O
Huey	O
to	O
act	O
as	O
MSF	O
's	O
deterrent	O
against	O
foreign	O
intervention	O
.	O
</s>
<s>
The	O
idea	O
of	O
Peace	B-Application
Walker	I-Application
originated	O
during	O
the	O
development	O
of	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
:	I-Application
Portable	I-Application
Ops	I-Application
.	O
</s>
<s>
Although	O
Kojima	O
planned	O
to	O
leave	O
the	O
project	O
in	O
the	O
hands	O
of	O
other	O
members	O
from	O
Kojima	O
Productions	O
,	O
in	O
order	O
to	O
make	O
the	O
plot	O
's	O
message	O
clearer	O
for	O
the	O
young	O
demographic	O
,	O
he	O
took	O
the	O
role	O
of	O
director	O
at	O
the	O
same	O
time	O
as	O
he	O
was	O
developing	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>
The	O
game	O
was	O
made	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
due	O
to	O
content	O
that	O
could	O
only	O
work	O
on	O
it	O
,	O
such	O
as	O
the	O
cooperative	O
multiplayer	O
feature	O
.	O
</s>
<s>
The	O
development	O
team	O
that	O
worked	O
on	O
Peace	B-Application
Walker	I-Application
was	O
as	O
large	O
as	O
the	O
team	O
that	O
worked	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>
Although	O
several	O
of	O
the	O
staff	O
members	O
had	O
already	O
worked	O
on	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
:	I-Application
Portable	I-Application
Ops	I-Application
,	O
Peace	B-Application
Walker	I-Application
was	O
created	O
with	O
a	O
different	O
mindset	O
.	O
</s>
<s>
Kojima	O
considered	O
Peace	B-Application
Walker	I-Application
to	O
be	O
the	O
biggest	O
game	O
he	O
has	O
ever	O
worked	O
on	O
.	O
</s>
<s>
During	O
the	O
planning	O
stages	O
,	O
the	O
game	O
was	O
known	O
as	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
5	O
:	O
Peace	B-Application
Walker	I-Application
.	O
</s>
<s>
As	O
seen	O
in	O
previous	O
Metal	B-Application
Gear	I-Application
games	O
,	O
Peace	B-Application
Walker	I-Application
features	O
antiwar	O
and	O
antinuclear	O
themes	O
,	O
this	O
time	O
focused	O
on	O
the	O
countries	O
 '	O
states	O
and	O
relationships	O
.	O
</s>
<s>
Character-wise	O
,	O
it	O
was	O
made	O
to	O
show	O
Snake	O
's	O
experiences	O
throughout	O
the	O
story	O
that	O
make	O
him	O
accept	O
the	O
title	O
of	O
Big	O
Boss	O
,	O
further	O
resembling	O
his	O
antagonist	O
persona	O
from	O
the	O
first	O
Metal	B-Application
Gear	I-Application
game	O
.	O
</s>
<s>
Due	O
to	O
the	O
game	O
's	O
intended	O
audience	O
,	O
Peace	B-Application
Walker	I-Application
is	O
the	O
first	O
main	O
Metal	B-Application
Gear	I-Application
game	O
to	O
receive	O
a	O
"	O
Teen	O
"	O
rating	O
from	O
the	O
ESRB	O
since	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
:	I-Application
Portable	I-Application
Ops	I-Application
Plus	O
.	O
</s>
<s>
The	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
:	I-Application
Peace	I-Application
Walker	I-Application
Original	O
Soundtrack	O
was	O
released	O
on	O
April	O
14	O
,	O
2010	O
.	O
</s>
<s>
The	O
game	O
also	O
features	O
music	O
from	O
other	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
games	I-Application
,	O
such	O
as	O
Portable	O
Opss	O
"	O
Calling	O
to	O
The	O
Night	O
"	O
,	O
which	O
can	O
be	O
played	O
in	O
the	O
game	O
's	O
Walkmans	O
.	O
</s>
<s>
In	O
the	O
context	O
of	O
the	O
game	O
,	O
the	O
song	O
appears	O
on	O
a	O
taped	O
recording	O
and	O
is	O
sung	O
by	O
the	O
Boss	O
AI	O
as	O
Peace	B-Application
Walker	I-Application
sinks	O
under	O
Lake	O
Cocibolca	O
.	O
</s>
<s>
The	O
game	O
also	O
used	O
the	O
Vocaloid	B-Application
software	O
.	O
</s>
<s>
On	O
March	O
27	O
,	O
2010	O
,	O
Japanese	O
beverage	O
firm	O
Suntory	O
released	O
a	O
special	O
line	O
of	O
eight	O
cans	O
in	O
Japan	O
that	O
have	O
images	O
of	O
various	O
Peace	B-Application
Walker	I-Application
characters	O
for	O
the	O
Mountain	O
Dew	O
and	O
Pepsi	O
Nex	O
lines	O
.	O
</s>
<s>
On	O
April	O
1	O
,	O
2010	O
,	O
Konami	O
released	O
a	O
short	O
promotional	O
video	O
with	O
Patrice	O
Desilets	O
,	O
the	O
creative	O
director	O
of	O
Assassin	B-Application
's	I-Application
Creed	I-Application
II	I-Application
.	O
</s>
<s>
Konami	O
and	O
Ubisoft	O
earlier	O
produced	O
an	O
Assassin	O
's	O
Creed-themed	O
April	O
Fool	O
's	O
Day	O
joke	O
for	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
4	I-Application
in	O
2008	O
,	O
which	O
featured	O
Snake	O
wearing	O
an	O
Altaïr	O
costume	O
.	O
</s>
<s>
Released	O
under	O
Square	O
's	O
Play	O
Arts	O
Kai	O
series	O
,	O
the	O
line	O
features	O
the	O
Sneaking	B-Application
Suit	I-Application
and	O
Jungle	O
Fatigues	O
variants	O
of	O
Snake	O
and	O
the	O
game	O
's	O
main	O
boss	O
machines	O
–	O
Chrysalis	O
(	O
the	O
VTOL	O
aircraft	O
featured	O
in	O
the	O
original	O
E3	O
trailer	O
)	O
,	O
Pupa	O
(	O
a	O
derivative	O
of	O
the	O
Shagohod	O
)	O
,	O
Basilisk	O
(	O
the	O
mech	O
being	O
carried	O
by	O
Chrysalis	O
in	O
the	O
TGS09	O
trailer	O
)	O
,	O
and	O
the	O
Cocoon	O
(	O
a	O
large	O
mobile	O
fortress	O
with	O
multiple	O
turrets	O
)	O
.	O
</s>
<s>
In	O
addition	O
,	O
parts	O
of	O
the	O
Peace	O
Sentinels	O
mechs	O
,	O
plus	O
special	O
game	O
logos	O
,	O
can	O
be	O
transferred	O
to	O
Front	B-Application
Mission	I-Application
Evolved	I-Application
for	O
use	O
in	O
the	O
Wanzers	O
.	O
</s>
<s>
The	O
line	O
has	O
since	O
expanded	O
to	O
add	O
figures	O
of	O
Battle	O
Dress	O
Snake	O
,	O
Miller	O
and	O
Metal	B-Application
Gear	I-Application
ZEKE	O
,	O
which	O
can	O
be	O
accessorized	O
with	O
certain	O
parts	O
packaged	O
in	O
the	O
Peace	O
Sentinels	O
mech	O
figures	O
.	O
</s>
<s>
Kaiyodo	O
's	O
Revoltech	O
line	O
followed	O
with	O
a	O
Snake	O
in	O
Sneaking	B-Application
Suit	I-Application
action	O
figure	O
in	O
2012	O
.	O
</s>
<s>
The	O
"	O
Code	O
Hunt	O
"	O
,	O
which	O
was	O
exclusive	O
to	O
United	O
States	O
customers	O
of	O
PlayStation	B-Protocol
Home	I-Protocol
,	O
would	O
have	O
teams	O
of	O
five	O
contestants	O
scouring	O
locations	O
for	O
elusive	O
Peace	B-Application
Walker	I-Application
codes	O
,	O
each	O
of	O
which	O
would	O
get	O
them	O
closer	O
and	O
closer	O
to	O
the	O
grand	O
prize	O
.	O
</s>
<s>
The	O
prizes	O
included	O
$	O
10,000	O
in	O
cash	O
and	O
Peace	B-Application
Walker	I-Application
Big	O
Boss	O
Bundles	O
.	O
</s>
<s>
A	O
nine-minute	O
video	O
was	O
shown	O
at	O
Gamescom	O
,	O
which	O
strongly	O
emphasized	O
its	O
co-operative	O
play	O
(	O
the	O
term	O
Co-Ops	O
was	O
used	O
frequently	O
,	O
obviously	O
mirroring	O
Portable	B-Application
Ops	I-Application
,	O
which	O
utilized	O
a	O
solo	O
sneaking	O
motif	O
for	O
its	O
story	O
mode	O
)	O
.	O
</s>
<s>
On	O
December	O
17	O
,	O
2009	O
,	O
the	O
official	O
English	O
demo	O
of	O
the	O
game	O
was	O
released	O
on	O
the	O
PlayStation	B-Device
Network	I-Device
,	O
containing	O
the	O
levels	O
from	O
the	O
2009	O
Tokyo	O
Game	O
Show	O
Japanese	O
demo	O
along	O
with	O
an	O
all-new	O
boss	O
battle	O
.	O
</s>
<s>
Two	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
:	I-Application
Peace	I-Application
Walker	I-Application
Bundle	O
versions	O
have	O
been	O
released	O
in	O
Japan	O
,	O
one	O
consists	O
of	O
the	O
game	O
with	O
a	O
camouflaged	O
PSP-3000	O
,	O
leather	O
pouch	O
,	O
leather	O
wrist	O
strap	O
,	O
cloth	O
,	O
dog	O
tags	O
,	O
numbered	O
collectible	O
stands	O
,	O
and	O
a	O
booklet	O
for	O
¥	O
36,980	O
or	O
US$404	O
with	O
1,974	O
copies	O
only	O
being	O
made	O
when	O
the	O
game	O
is	O
released	O
on	O
March	O
18	O
,	O
2010	O
,	O
from	O
the	O
Konami	O
Style	O
Store	O
.	O
</s>
<s>
The	O
other	O
bundle	O
offer	O
includes	O
the	O
camouflaged	O
PSP-3000	O
,	O
a	O
pouch	O
,	O
a	O
wrist	O
strap	O
,	O
a	O
camouflaged	O
cleaning	O
cloth	O
and	O
the	O
Peace	B-Application
Walker	I-Application
UMD	O
for	O
¥	O
26,980	O
or	O
US$295	O
.	O
</s>
<s>
For	O
North	O
and	O
South	O
American	O
players	O
,	O
Sony	O
released	O
a	O
special	O
GameStop	O
exclusive	O
Big	O
Boss	O
Pack	O
that	O
featured	O
a	O
camouflaged	O
PSP-3000	O
with	O
the	O
UMD	O
game	O
,	O
a	O
downloadable	O
movie	O
voucher	O
for	O
the	O
PlayStation	B-Device
Network	I-Device
,	O
a	O
code	O
to	O
unlock	O
special	O
in-game	O
content	O
and	O
a	O
4GB	O
Memory	O
Stick	O
PRO	O
Duo	O
.	O
</s>
<s>
After	O
the	O
release	O
of	O
Peace	B-Application
Walker	I-Application
,	O
additional	O
content	O
could	O
be	O
downloaded	O
through	O
the	O
Network	O
function	O
in	O
the	O
extras	O
menu	O
.	O
</s>
<s>
Additional	O
content	O
included	O
uniforms	O
and	O
t-shirt	O
designs	O
for	O
player	O
characters	O
,	O
additional	O
music	O
for	O
the	O
Walkman	O
,	O
new	O
AI	O
boss	O
voices	O
,	O
extra	O
Vocaloid	B-Application
songs	O
and	O
additional	O
magazine	O
covers	O
and	O
two	O
comic	O
magazines	O
for	O
the	O
Japanese	O
versions	O
.	O
</s>
<s>
Players	O
could	O
also	O
use	O
the	O
NetVocaloid	O
services	O
to	O
create	O
their	O
own	O
Vocaloid	B-Application
files	O
,	O
which	O
could	O
be	O
used	O
as	O
voices	O
for	O
Metal	B-Application
Gear	I-Application
ZEKE	O
,	O
Co-Ops	O
communications	O
,	O
song	O
lyrics	O
,	O
and	O
other	O
uses	O
.	O
</s>
<s>
The	O
DLC	O
for	O
the	O
PSP	B-Operating_System
version	O
have	O
since	O
been	O
preserved	O
through	O
third-party	O
websites	O
.	O
</s>
<s>
A	O
graphically	O
enhanced	O
version	O
of	O
Peace	B-Application
Walker	I-Application
was	O
produced	O
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
in	O
2011	O
.	O
</s>
<s>
Titled	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
:	I-Application
Peace	I-Application
Walker	I-Application
-	O
HD	O
Edition	O
,	O
it	O
was	O
included	O
in	O
the	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
HD	I-Application
Collection	I-Application
in	O
North	O
America	O
and	O
Europe	O
,	O
and	O
given	O
a	O
stand-alone	O
retail	O
release	O
in	O
Japan	O
.	O
</s>
<s>
It	O
also	O
contains	O
some	O
of	O
the	O
downloadable	O
content	O
from	O
the	O
PSP	B-Operating_System
version	O
,	O
such	O
as	O
the	O
13	O
additional	O
camo	O
patterns	O
for	O
the	O
player	O
's	O
combat	O
fatigues	O
and	O
Vocaloid	B-Application
add-ons	O
for	O
the	O
AI	O
weapons	O
,	O
already	O
available	O
by	O
default	O
.	O
</s>
<s>
The	B-Operating_System
PS3	I-Operating_System
version	O
of	O
Peace	B-Application
Walker	I-Application
allows	O
players	O
to	O
transfer	O
their	O
save	O
data	O
to	O
the	O
PSP	B-Operating_System
version	O
,	O
and	O
vice	O
versa	O
,	O
through	O
the	O
use	O
of	O
the	O
"	O
Transfarring	O
"	O
feature	O
.	O
</s>
<s>
Peace	B-Application
Walker	I-Application
was	O
not	O
included	O
in	O
the	O
PlayStation	B-Device
Vita	I-Device
version	O
of	O
the	O
HD	O
Collection	O
due	O
to	O
the	O
PSP	B-Operating_System
version	O
of	O
Peace	B-Application
Walker	I-Application
being	O
available	O
as	O
a	O
digital	O
download	O
on	O
the	O
PlayStation	O
Store	O
.	O
</s>
<s>
However	O
,	O
the	O
Japanese	O
PS3	B-Operating_System
version	O
includes	O
a	O
voucher	O
code	O
to	O
download	O
the	O
PSP	B-Operating_System
version	O
.	O
</s>
<s>
Other	O
content	O
include	O
additional	O
"	O
Snake	O
&	O
Kaz	O
"	O
drama	O
tracks	O
,	O
music	O
tracks	O
not	O
featured	O
in	O
the	O
Peace	B-Application
Walker	I-Application
soundtrack	O
album	O
and	O
two	O
cover	O
renditions	O
of	O
Japanese	O
songs	O
performed	O
by	O
the	O
voice	O
actors	O
from	O
the	O
game	O
as	O
their	O
characters	O
:	O
sung	O
by	O
Tomokazu	O
Sugita	O
(	O
as	O
Miller	O
)	O
and	O
performed	O
by	O
Akio	O
Ohtsuka	O
(	O
as	O
Snake	O
)	O
.	O
</s>
<s>
The	O
"	O
Encounter	O
"	O
portion	O
of	O
the	O
album	O
is	O
included	O
in	O
the	O
Japanese	O
version	O
of	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
V	I-Application
:	I-Application
Ground	I-Application
Zeroes	I-Application
with	O
optional	O
English	O
subtitles	O
available	O
.	O
</s>
<s>
A	O
novelization	O
of	O
Peace	B-Application
Walker	I-Application
was	O
published	O
in	O
Japan	O
in	O
March	O
2014	O
,	O
authored	O
by	O
Kenji	O
Yano	O
under	O
the	O
"	O
Hitori	O
Nojima	O
"	O
pen	O
name	O
.	O
</s>
<s>
Two	O
versions	O
of	O
the	O
novel	O
were	O
published	O
:	O
a	O
standard	O
edition	O
that	O
was	O
sold	O
by	O
itself	O
and	O
a	O
special	O
edition	O
included	O
with	O
the	O
Ground	B-Application
Zeroes	I-Application
premium	O
package	O
sold	O
exclusively	O
by	O
Amazon	B-Application
Japan	I-Application
.	O
</s>
<s>
It	O
was	O
given	O
a	O
perfect	O
score	O
of	O
40/40	O
in	O
the	O
May	O
5	O
,	O
2010	O
issue	O
of	O
Japanese	O
magazine	O
Weekly	O
Famitsu	O
;	O
making	O
it	O
the	O
fourteenth	O
game	O
to	O
achieve	O
a	O
perfect	O
score	O
,	O
as	O
well	O
as	O
the	O
first	O
title	O
for	O
the	O
PSP	B-Operating_System
.	O
</s>
<s>
PSM3	O
awarded	O
the	O
game	O
91%	O
,	O
commenting	O
on	O
the	O
game	O
's	O
ability	O
to	O
"	O
take	O
the	O
best	O
bits	O
from	O
every	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
game	O
–	O
the	O
recruitment	O
tricks	O
...	O
from	O
Portable	B-Application
Ops	I-Application
,	O
the	O
camouflage	O
and	O
multi-player	O
from	O
MGS3	B-Application
:	O
Snake	O
Eater	O
,	O
the	O
stripped-down	O
controls	O
from	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
4	I-Application
and	O
the	O
bonus	O
missions	O
...	O
from	O
VR	O
Missions	O
"	O
.	O
</s>
<s>
IGNs	O
Greg	O
Miller	O
gave	O
the	O
game	O
a	O
score	O
of	O
9.5/10	O
,	O
stating	O
that	O
it	O
"	O
is	O
probably	O
the	O
biggest	O
game	O
in	O
the	O
Metal	B-Application
Gear	I-Application
series	I-Application
,	O
and	O
it	O
's	O
only	O
on	O
Sony	O
's	O
smallest	O
system	O
"	O
.	O
</s>
<s>
Despite	O
initial	O
hopes	O
from	O
Konami	O
that	O
the	O
game	O
would	O
become	O
an	O
international	O
hit	O
,	O
sales	O
of	O
Peace	B-Application
Walker	I-Application
have	O
been	O
very	O
poor	O
outside	O
Japan	O
.	O
</s>
<s>
In	O
the	O
United	O
States	O
the	O
game	O
similarly	O
failed	O
to	O
make	O
the	O
top	O
20	O
during	O
its	O
first	O
month	O
,	O
selling	O
only	O
52,000	O
physical	O
UMD	O
copies	O
,	O
a	O
markedly	O
worse	O
performance	O
than	O
Metal	B-Application
Gear	I-Application
Acid	I-Application
.	O
</s>
<s>
However	O
,	O
with	O
the	O
PSP	B-Operating_System
's	O
digital	O
content	O
delivery	O
option	O
through	O
PSN	B-Device
,	O
it	O
has	O
been	O
noted	O
that	O
perhaps	O
sales	O
on	O
the	O
PSP	B-Operating_System
should	O
be	O
counted	O
differently	O
since	O
digital	O
downloads	O
on	O
PSP	B-Operating_System
and	O
PSPgo	O
are	O
not	O
counted	O
.	O
</s>
<s>
Industry	O
analyst	O
Mike	O
Hickey	O
told	O
IGN	O
that	O
poor	O
sales	O
of	O
the	O
PSP	B-Operating_System
platform	O
itself	O
was	O
likely	O
"	O
the	O
main	O
cause	O
"	O
for	O
Peace	B-Application
Walkers	I-Application
unimpressive	O
sales	O
.	O
</s>
<s>
However	O
,	O
Konami	O
has	O
stated	O
they	O
have	O
a	O
profit	O
of	O
$15	O
million	O
from	O
sales	O
of	O
Peace	B-Application
Walker	I-Application
and	O
Pro	B-Application
Evolution	I-Application
Soccer	I-Application
games	O
,	O
but	O
they	O
did	O
not	O
provide	O
sales	O
figures	O
for	O
Peace	B-Application
Walker	I-Application
.	O
</s>
<s>
They	O
have	O
however	O
,	O
said	O
Peace	B-Application
Walker	I-Application
sales	O
helped	O
Metal	B-Application
Gear	I-Application
games	O
sell	O
1.27	O
million	O
copies	O
for	O
the	O
quarter	O
.	O
</s>
<s>
The	O
low	O
sales	O
of	O
Peace	B-Application
Walker	I-Application
overseas	O
was	O
cited	O
by	O
Hideo	O
Kojima	O
as	O
the	O
reason	O
why	O
Kazuhira	O
Miller	O
was	O
omitted	O
from	O
the	O
box	O
art	O
of	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
V	I-Application
:	I-Application
Ground	I-Application
Zeroes	I-Application
for	O
its	O
international	O
release	O
.	O
</s>
<s>
As	O
of	O
2014	O
,	O
Peace	B-Application
Walker	I-Application
has	O
sold	O
1.99	O
million	O
copies	O
on	O
the	O
PSP	B-Operating_System
.	O
</s>
<s>
Peace	B-Application
Walker	I-Application
received	O
the	O
Best	O
of	O
Show	O
and	O
Best	O
PSP	B-Operating_System
Game	O
awards	O
during	O
the	O
2009	O
Tokyo	O
Game	O
Show	O
.	O
</s>
<s>
IGN	O
later	O
put	O
the	O
game	O
in	O
its	O
Best	O
of	O
2010	O
list	O
,	O
where	O
it	O
garnered	O
awards	O
for	O
PSP	B-Operating_System
Game	O
of	O
the	O
Year	O
,	O
Most	O
Addictive	O
Game	O
,	O
Best	O
Visuals	O
,	O
Most	O
Bang	O
for	O
Your	O
Buck	O
,	O
Best	O
Story	O
,	O
Best	O
Co-Op	O
and	O
Coolest	O
Atmosphere	O
.	O
</s>
