<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
is	O
a	O
2008	O
first-person	O
shooter	O
game	O
developed	O
by	O
Treyarch	O
and	O
published	O
by	O
Activision	O
.	O
</s>
<s>
It	O
was	O
released	O
for	O
Microsoft	B-Application
Windows	I-Application
,	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
Wii	B-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
in	O
November	O
2008	O
.	O
</s>
<s>
It	O
is	O
the	O
fifth	O
main	O
installment	O
of	O
the	O
Call	B-Application
of	I-Application
Duty	I-Application
series	O
and	O
returns	O
the	O
setting	O
to	O
World	O
War	O
II	O
.	O
</s>
<s>
World	O
at	O
War	O
received	O
ports	O
featuring	O
different	O
storyline	O
versions	O
,	O
while	O
remaining	O
in	O
the	O
World	O
War	O
II	O
setting	O
,	O
for	O
the	O
Nintendo	B-Application
DS	I-Application
and	O
PlayStation	B-Device
2	I-Device
.	O
</s>
<s>
It	O
was	O
the	O
first	O
game	O
in	O
the	O
series	O
to	O
feature	O
the	O
zombies	B-Application
mode	O
featured	O
in	O
later	O
sequels	O
.	O
</s>
<s>
A	O
Windows	B-Operating_System
Mobile	I-Operating_System
version	O
was	O
also	O
made	O
available	O
by	O
Glu	O
Mobile	O
.	O
</s>
<s>
It	O
is	O
told	O
from	O
the	O
perspectives	O
of	O
Marine	O
Raider	O
Private	O
C	O
.	O
Miller	O
,	O
US	O
Navy	O
Petty	O
Officer	O
Locke	O
and	O
Red	O
Army	O
soldier	O
Private	O
Dimitri	B-Application
Petrenko	I-Application
,	O
and	O
is	O
based	O
on	O
several	O
historical	O
battles	O
.	O
</s>
<s>
The	O
multiplayer	O
component	O
of	O
the	O
game	O
contains	O
various	O
game	O
modes	O
and	O
a	O
leveling	O
system	O
that	O
allows	O
the	O
player	O
to	O
unlock	O
additional	O
weapons	O
and	O
rewards	O
as	O
they	O
progress	O
,	O
similar	O
to	O
Call	B-Application
of	I-Application
Duty	I-Application
4	O
and	O
repeated	O
in	O
many	O
following	O
Call	B-Application
of	I-Application
Duty	I-Application
entries	O
.	O
</s>
<s>
The	O
game	O
also	O
contains	O
downloadable	B-Protocol
content	I-Protocol
called	O
"	O
map	O
packs	O
"	O
,	O
which	O
can	O
be	O
purchased	O
online	O
.	O
</s>
<s>
A	O
new	O
feature	O
to	O
the	O
series	O
was	O
the	O
addition	O
of	O
a	O
cooperative	O
mode	O
,	O
which	O
supports	O
up	O
to	O
two	O
players	O
locally	O
and	O
four	O
players	O
online	O
,	O
as	O
well	O
as	O
the	O
introduction	O
of	O
the	O
Zombies	B-Application
mode	O
.	O
</s>
<s>
Development	O
for	O
World	O
at	O
War	O
took	O
two	O
years	O
and	O
began	O
after	O
the	O
release	O
of	O
Treyarch	O
's	O
previous	O
title	O
,	O
Call	B-Application
of	I-Application
Duty	I-Application
3	I-Application
,	O
which	O
was	O
also	O
set	O
in	O
World	O
War	O
II	O
and	O
was	O
their	O
first	O
title	O
they	O
developed	O
for	O
the	O
series	O
.	O
</s>
<s>
The	O
game	O
is	O
based	O
on	O
an	O
enhanced	O
version	O
of	O
the	O
IW	B-Application
engine	I-Application
developed	O
by	O
Infinity	O
Ward	O
with	O
increased	O
development	O
on	O
audio	O
and	O
visual	O
effects	O
.	O
</s>
<s>
It	O
also	O
marked	O
the	O
beginning	O
of	O
the	O
Black	O
Ops	O
subseries	O
,	O
as	O
characters	O
from	O
the	O
game	O
were	O
carried	O
over	O
into	O
its	O
sequel	O
,	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
(	O
2010	O
)	O
.	O
</s>
<s>
The	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
of	O
World	O
at	O
War	O
became	O
backwards	O
compatible	O
on	O
the	B-Device
Xbox	I-Device
One	I-Device
in	O
September	O
2016	O
.	O
</s>
<s>
World	O
at	O
War	O
features	O
more	O
mature	O
themes	O
than	O
previous	O
Call	B-Application
of	I-Application
Duty	I-Application
installments	O
and	O
is	O
open-ended	O
,	O
giving	O
the	O
player	O
multiple	O
ways	O
to	O
complete	O
objectives	O
,	O
but	O
otherwise	O
generally	O
plays	O
like	O
previous	O
iterations	O
of	O
the	O
franchise	O
.	O
</s>
<s>
Players	O
fight	O
alongside	O
AI-controlled	O
teammates	O
.	O
</s>
<s>
When	O
playing	O
the	B-Operating_System
Wii	I-Operating_System
version	O
of	O
the	O
game	O
,	O
instead	O
of	O
using	O
a	O
normal	O
controller	O
,	O
such	O
as	O
the	O
ones	O
used	O
by	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
an	O
optional	O
gun-like	O
expansion	O
controller	O
known	O
as	O
the	B-Operating_System
Wii	I-Operating_System
Zapper	O
can	O
be	O
used	O
.	O
</s>
<s>
The	O
Zapper	O
,	O
or	O
Wii	B-Device
Remote	I-Device
and	O
Nunchuk	O
,	O
can	O
be	O
used	O
to	O
aim	O
at	O
targets	O
to	O
fire	O
at	O
them	O
and	O
simulate	O
marksmanship	O
.	O
</s>
<s>
World	O
at	O
Wars	O
multiplayer	O
experience	O
resembles	O
the	O
one	O
established	O
in	O
Call	B-Application
of	I-Application
Duty	I-Application
4	I-Application
:	I-Application
Modern	I-Application
Warfare	I-Application
.	O
</s>
<s>
All	O
versions	O
of	O
the	O
game	O
use	O
a	O
similar	O
perk	O
and	O
ranking	O
system	O
and	O
feature	O
six	O
multiplayer	O
modes	O
,	O
including	O
Team	O
Deathmatch	O
and	O
capture	B-Application
the	I-Application
flag	I-Application
.	O
</s>
<s>
The	B-Operating_System
Wii	I-Operating_System
version	O
of	O
the	O
game	O
does	O
not	O
include	O
online	O
co-op	O
,	O
but	O
two	O
players	O
can	O
play	O
through	O
a	O
"	O
squadmate	O
co-op	O
"	O
mode	O
which	O
allows	O
both	O
players	O
to	O
experience	O
the	O
game	O
through	O
the	O
same	O
screen	O
and	O
point	O
of	O
view	O
.	O
</s>
<s>
All	O
versions	O
of	O
World	O
at	O
War	O
(	O
with	O
the	O
exception	O
of	O
that	O
for	O
the	B-Operating_System
Wii	I-Operating_System
)	O
features	O
the	O
minigame	O
Nazi	O
Zombies	B-Application
.	O
</s>
<s>
This	O
is	O
the	O
first	O
time	O
the	O
"	O
Zombies	B-Application
"	O
mode	O
ever	O
appeared	O
in	O
any	O
Call	B-Application
of	I-Application
Duty	I-Application
game	O
.	O
</s>
<s>
The	O
mode	O
consists	O
of	O
1-4	O
players	O
fighting	O
an	O
unlimited	O
number	O
of	O
waves	O
of	O
Nazi	O
zombies	B-Application
.	O
</s>
<s>
Players	O
can	O
work	O
together	O
with	O
other	O
people	O
to	O
kill	O
the	O
zombies	B-Application
in	O
a	O
"	O
co-op	O
"	O
(	O
cooperative	O
)	O
mode	O
either	O
offline	O
with	O
1-2	O
players	O
or	O
online	O
with	O
2-4	O
players	O
.	O
</s>
<s>
The	O
players	O
gain	O
points	O
by	O
injuring	O
or	O
killing	O
the	O
zombies	B-Application
or	O
repairing	O
boarded-up	O
windows	O
,	O
which	O
are	O
used	O
to	O
remove	O
blockages	O
inside	O
the	O
bunker	O
and	O
to	O
gain	O
access	O
to	O
more	O
useful	O
weapons	O
than	O
the	O
starting	O
M1911	O
pistol	O
and	O
unlock	O
more	O
rooms	O
.	O
</s>
<s>
Zombies	B-Application
continually	O
break	O
the	O
windows	O
to	O
gain	O
entrance	O
and	O
to	O
down	O
the	O
players	O
;	O
when	O
all	O
players	O
are	O
damaged	O
enough	O
to	O
fall	O
,	O
the	O
game	O
is	O
over	O
.	O
</s>
<s>
Three	O
extra	O
maps	O
for	O
Nazi	O
Zombies	B-Application
were	O
added	O
with	O
the	O
World	O
at	O
War	O
map	O
packs	O
.	O
</s>
<s>
Private	O
Dimitri	B-Application
Petrenko	I-Application
,	O
the	O
second	O
playable	O
character	O
,	O
fights	O
on	O
the	O
Eastern	O
Front	O
with	O
Sergeant	O
Viktor	O
Reznov	O
(	O
voiced	O
by	O
Gary	O
Oldman	O
)	O
.	O
</s>
<s>
During	O
the	O
Battle	O
of	O
Stalingrad	O
on	O
the	O
Eastern	O
Front	O
in	O
September	O
1942	O
,	O
Private	O
Dimitri	B-Application
Petrenko	I-Application
regains	O
consciousness	O
in	O
a	O
body-filled	O
fountain	O
as	O
invading	O
German	O
troops	O
execute	O
his	O
comrades	O
.	O
</s>
<s>
Dimitri	O
meets	O
Sergeant	O
Viktor	O
Reznov	O
,	O
another	O
survivor	O
,	O
who	O
tells	O
him	O
of	O
his	O
mission	O
to	O
kill	O
German	O
general	B-Application
Heinrich	I-Application
Amsel	I-Application
,	O
who	O
is	O
responsible	O
for	O
numerous	O
war	O
crimes	O
across	O
the	O
Soviet	O
Union	O
.	O
</s>
<s>
The	O
game	O
took	O
about	O
two	O
years	O
to	O
make	O
,	O
twice	O
as	O
long	O
as	O
Treyarch	O
's	O
previous	O
entry	O
to	O
the	O
series	O
,	O
Call	B-Application
of	I-Application
Duty	I-Application
3	I-Application
.	O
</s>
<s>
The	O
game	O
is	O
powered	O
by	O
an	O
improved	O
version	O
of	O
the	O
Call	B-Application
of	I-Application
Duty	I-Application
4	I-Application
:	I-Application
Modern	I-Application
Warfare	I-Application
engine	O
,	O
with	O
several	O
improvements	O
made	O
to	O
the	O
physics	O
model	O
.	O
</s>
<s>
Exakt	O
Entertainment	O
assisted	O
in	O
porting	O
the	O
game	O
in	O
this	O
engine	O
to	O
the	B-Operating_System
Wii	I-Operating_System
.	O
</s>
<s>
Not	O
long	O
after	O
,	O
Treyarch	O
released	O
the	O
modding	O
tools	O
for	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
.	O
</s>
<s>
These	O
tools	O
were	O
the	O
same	O
ones	O
used	O
to	O
create	O
all	O
the	O
other	O
Call	B-Application
of	I-Application
Duty	I-Application
series	O
games	O
,	O
but	O
with	O
slight	O
changes	O
version	O
to	O
version	O
,	O
which	O
can	O
be	O
downloaded	O
online	O
.	O
</s>
<s>
A	O
full-sized	O
replica	O
PBY	O
Catalina	O
was	O
constructed	O
for	O
motion	B-Application
capture	I-Application
use	O
.	O
</s>
<s>
The	O
music	O
for	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
was	O
composed	O
by	O
Sean	O
Murray	O
.	O
</s>
<s>
He	O
had	O
worked	O
with	O
Brian	O
Tuey	O
,	O
Treyarch	O
's	O
audio	O
director	O
,	O
on	O
True	B-Application
Crime	I-Application
:	I-Application
New	I-Application
York	I-Application
City	I-Application
,	O
the	O
sequel	O
to	O
the	O
first	O
True	B-Application
Crime	I-Application
:	I-Application
Streets	I-Application
of	I-Application
LA	I-Application
.	O
</s>
<s>
Murray	O
said	O
Tuey	O
"	O
knew	O
I	O
would	O
bring	O
a	O
fresh	O
approach	O
to	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
"	O
.	O
</s>
<s>
For	O
the	O
first	O
time	O
in	O
a	O
Call	B-Application
of	I-Application
Duty	I-Application
game	O
,	O
the	O
player	O
is	O
able	O
to	O
tell	O
the	O
difference	O
between	O
someone	O
walking	O
next	O
to	O
the	O
player	O
and	O
someone	O
walking	O
above	O
or	O
below	O
the	O
player	O
,	O
as	O
well	O
as	O
telling	O
the	O
difference	O
between	O
a	O
shot	O
fired	O
in	O
the	O
distance	O
and	O
a	O
shot	O
fired	O
close	O
by	O
,	O
but	O
behind	O
a	O
solid	O
object	O
.	O
</s>
<s>
Microphones	B-Application
were	O
placed	O
behind	O
and	O
60	O
yards	O
in	O
front	O
of	O
the	O
gun	O
to	O
test	O
the	O
echoes	O
.	O
</s>
<s>
The	O
first	O
trailer	O
for	O
the	O
game	O
premiered	O
on	O
Xbox	B-Application
Live	I-Application
on	O
June	O
21	O
,	O
2008	O
,	O
and	O
arrived	O
on	O
PlayStation	B-Device
Network	I-Device
five	O
days	O
later	O
.	O
</s>
<s>
A	O
beta	O
of	O
the	O
game	O
's	O
online	O
multiplayer	O
mode	O
was	O
released	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
on	O
October	O
10	O
,	O
2008	O
.	O
</s>
<s>
Those	O
who	O
pre-ordered	O
the	O
game	O
at	O
GameStop	O
,	O
Game	O
and	O
EB	O
Games	O
in	O
Australia	O
or	O
North	O
America	O
or	O
who	O
are	O
members	O
of	O
the	O
Call	B-Application
of	I-Application
Duty	I-Application
official	O
website	O
were	O
given	O
codes	O
which	O
allowed	O
them	O
to	O
download	O
both	O
beta	O
versions	O
of	O
the	O
game	O
.	O
</s>
<s>
It	O
includes	O
several	O
bonus	O
items	O
,	O
among	O
them	O
a	O
stainless	O
steel	O
canteen	O
imprinted	O
with	O
the	O
Call	B-Application
of	I-Application
Duty	I-Application
series	O
logo	O
and	O
a	O
metal	O
storage	O
tin	O
.	O
</s>
<s>
This	O
edition	O
of	O
the	O
game	O
is	O
only	O
available	O
for	O
the	O
Microsoft	B-Application
Windows	I-Application
and	O
Xbox	B-Operating_System
360	I-Operating_System
platforms	O
.	O
</s>
<s>
On	O
February	O
26	O
,	O
2009	O
,	O
an	O
update	O
was	O
made	O
available	O
to	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
versions	O
,	O
as	O
well	O
as	O
the	O
addition	O
of	O
a	O
new	O
multiplayer	O
map	O
,	O
Makin	O
Day	O
.	O
</s>
<s>
The	O
Makin	O
Day	O
map	O
was	O
released	O
for	O
Microsoft	B-Application
Windows	I-Application
on	O
February	O
6	O
,	O
2009	O
,	O
in	O
the	O
downloadable	O
patch	O
1.2	O
.	O
</s>
<s>
On	O
March	O
18	O
,	O
2009	O
,	O
Activision	O
and	O
Treyarch	O
announced	O
that	O
downloadable	B-Protocol
content	I-Protocol
(	O
DLC	B-Protocol
)	O
was	O
under	O
development	O
for	O
World	O
at	O
War	O
,	O
titled	O
Map	O
Pack	O
1	O
.	O
</s>
<s>
This	O
first	O
installment	O
of	O
DLC	B-Protocol
was	O
released	O
on	O
March	O
19	O
,	O
2009	O
,	O
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
,	O
while	O
the	O
Windows	O
version	O
received	O
the	O
DLC	B-Protocol
at	O
a	O
later	O
date	O
.	O
</s>
<s>
The	O
map	O
pack	O
includes	O
three	O
new	O
multiplayer	O
maps	O
and	O
one	O
new	O
Nazi	O
Zombies	B-Application
map	O
,	O
entitled	O
"	O
Zombie	B-Application
Verrückt	O
"	O
(	O
)	O
.	O
</s>
<s>
The	O
map	O
includes	O
new	B-Application
weapons	I-Application
and	O
power-ups	O
intended	O
to	O
expand	O
the	O
experience	O
.	O
</s>
<s>
Players	O
can	O
turn	O
on	O
a	O
power	O
generator	O
that	O
reunites	O
both	O
sides	O
of	O
the	O
map	O
and	O
enables	O
"	O
Perk-a-Cola	O
"	O
machines	O
,	O
which	O
have	O
been	O
featured	O
in	O
every	O
subsequent	O
Nazi	O
Zombies	B-Application
map	O
.	O
</s>
<s>
Reports	O
stated	O
that	O
Map	O
Pack	O
1	O
sold	O
over	O
1	O
million	O
copies	O
in	O
the	O
first	O
week	O
of	O
availability	O
,	O
setting	O
an	O
Xbox	B-Application
Live	I-Application
record	O
for	O
the	O
number	O
of	O
downloads	O
in	O
a	O
week	O
.	O
</s>
<s>
"	O
Shi	O
No	O
Numa	O
"	O
(死の沼	O
 "	O
'	O
swamp	O
of	O
death	O
 '	O
)	O
is	O
a	O
new	O
map	O
on	O
the	O
Nazi	O
Zombies	B-Application
co-op	O
mode	O
,	O
set	O
in	O
a	O
misty	O
swamp-land	O
surrounded	O
by	O
jungle	O
.	O
</s>
<s>
The	O
map	O
also	O
introduced	O
four	O
new	O
playable	O
characters	O
who	O
have	O
appeared	O
in	O
several	O
subsequent	O
Nazi	O
Zombie	B-Application
maps	O
:	O
Tank	O
Dempsey	O
U.S.M.C	O
,	O
Nikolai	O
Belinski	O
of	O
the	O
Red	O
Army	O
,	O
Nazi	O
Doctor	O
Edward	O
Richtofen	O
and	O
Takeo	O
Masaki	O
of	O
the	O
Japanese	O
Imperial	O
Army	O
.	O
</s>
<s>
This	O
DLC	B-Protocol
also	O
consists	O
of	O
three	O
new	O
multiplayer	O
maps	O
and	O
a	O
new	O
Nazi	O
Zombies	B-Application
map	O
.	O
</s>
<s>
The	O
new	O
Nazi	O
Zombies	B-Application
map	O
,	O
"	O
Der	O
Riese	O
"	O
which	O
means	O
"	O
The	O
Giant	O
"	O
in	O
English	O
,	O
is	O
based	O
in	O
a	O
factory	O
where	O
"	O
element	O
115	O
"	O
is	O
being	O
processed	O
and	O
used	O
to	O
build	O
teleporters	O
and	O
other	O
mysterious	O
devices	O
,	O
such	O
as	O
the	O
"	O
Pack-a-Punch	O
Machine	O
"	O
,	O
which	O
upgrades	O
guns	O
,	O
such	O
as	O
the	O
Wunderwaffe	O
DG-2	O
.	O
</s>
<s>
New	B-Application
weapons	I-Application
such	O
as	O
Monkey	O
Bombs	O
were	O
also	O
added	O
.	O
</s>
<s>
This	O
map	O
also	O
introduced	O
the	O
official	O
backstory	O
to	O
Zombies	B-Application
mode	O
,	O
which	O
is	O
continued	O
into	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
.	O
</s>
<s>
All	O
map	O
packs	O
were	O
released	O
for	O
free	O
on	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
The	O
packs	O
were	O
paid	O
DLC	B-Protocol
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PS3	B-Operating_System
.	O
</s>
<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
was	O
released	O
for	O
the	O
Nintendo	B-Application
DS	I-Application
on	O
November	O
11	O
,	O
2008	O
in	O
North	O
America	O
,	O
and	O
on	O
November	O
14	O
in	O
Europe	O
.	O
</s>
<s>
It	O
was	O
published	O
by	O
Activision	O
and	O
developed	O
by	O
n-Space	O
,	O
who	O
used	O
the	O
same	O
game	O
engine	O
as	O
their	O
previous	O
title	O
,	O
Call	B-Application
of	I-Application
Duty	I-Application
4	I-Application
:	I-Application
Modern	I-Application
Warfare	I-Application
.	O
</s>
<s>
The	O
PlayStation	B-Device
2	I-Device
version	O
,	O
titled	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
:	I-Application
Final	I-Application
Fronts	I-Application
,	O
differs	O
significantly	O
from	O
the	O
main	O
versions	O
.	O
</s>
<s>
Final	O
Fronts	O
does	O
not	O
feature	O
online	O
multiplayer	O
or	O
a	O
Nazi	O
Zombies	B-Application
mode	O
.	O
</s>
<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
Zombies	I-Application
was	O
released	O
for	O
the	O
iPhone	B-Device
and	O
iPod	B-Device
Touch	I-Device
on	O
November	O
16	O
,	O
2009	O
,	O
by	O
Activision	O
,	O
Treyarch	O
,	O
and	O
Ideaworks	O
Game	O
Studio	O
.	O
</s>
<s>
The	O
game	O
is	O
based	O
on	O
the	O
Nazi	O
Zombies	B-Application
mode	O
in	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
,	O
and	O
featured	O
a	O
tutorial	O
map	O
and	O
maps	O
called	O
Nacht	B-Application
der	I-Application
Untoten	I-Application
,	O
Shi	O
No	O
Numa	O
and	O
Der	O
Riese	O
,	O
with	O
a	O
downloadable	O
map	O
named	O
Zombie	B-Application
Verrückt	O
.	O
</s>
<s>
In	O
2010	O
,	O
an	O
HD	O
iPad	O
version	O
was	O
released	O
with	O
enhanced	O
graphics	O
and	O
the	O
Zombie	B-Application
Verrückt	O
map	O
free	O
to	O
play	O
without	O
buying	O
,	O
but	O
without	O
the	O
Shi	O
No	O
Numa	O
and	O
Der	O
Riese	O
maps	O
.	O
</s>
<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
was	O
released	O
for	O
the	O
Windows	B-Operating_System
Mobile	I-Operating_System
.	O
</s>
<s>
However	O
,	O
the	O
game	O
features	O
a	O
run	O
and	O
gun	O
genre	O
similar	O
to	O
Commando	B-Application
from	O
Capcom	O
rather	O
than	O
a	O
first-person	O
shooter	O
,	O
a	O
different	O
storyline	O
,	O
and	O
a	O
different	O
set	O
of	O
characters	O
.	O
</s>
<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
received	O
"	O
generally	O
positive	O
"	O
reviews	O
,	O
according	O
to	O
review	B-Application
aggregator	I-Application
Metacritic	O
.	O
</s>
<s>
Overall	O
,	O
the	O
Official	O
Xbox	B-Operating_System
Magazine	O
described	O
the	O
game	O
as	O
being	O
more	O
like	O
an	O
expansion	O
pack	O
in	O
the	O
Call	B-Application
of	I-Application
Duty	I-Application
series	O
rather	O
than	O
a	O
full	O
game	O
.	O
</s>
<s>
Official	O
Xbox	B-Operating_System
Magazine	O
's	O
main	O
criticism	O
was	O
that	O
Treyarch	O
had	O
not	O
expanded	O
upon	O
the	O
success	O
of	O
Call	B-Application
of	I-Application
Duty	I-Application
4	I-Application
:	I-Application
Modern	I-Application
Warfare	I-Application
,	O
but	O
had	O
instead	O
created	O
a	O
"	O
play-it-safe	O
sequel	O
"	O
that	O
used	O
elements	O
of	O
Call	B-Application
of	I-Application
Duty	I-Application
4	O
but	O
added	O
"	O
nothing	O
noteworthy	O
of	O
its	O
own.	O
"	O
</s>
<s>
GameSpot	O
criticized	O
the	O
game	O
's	O
use	O
of	O
"	O
well-worn	O
source	O
material	O
"	O
and	O
"	O
déjà	O
vu	O
"	O
game	O
mechanics	O
,	O
also	O
implying	O
its	O
similarity	O
to	O
the	O
Call	B-Application
of	I-Application
Duty	I-Application
series	O
 '	O
other	O
games	O
.	O
</s>
<s>
1UP.com	O
noted	O
the	O
significantly	O
increased	O
graphic	O
violence	O
and	O
gore	O
(	O
even	O
over	O
the	O
M-rated	O
Call	B-Application
of	I-Application
Duty	I-Application
4	O
)	O
as	O
a	O
positive	O
improvement	O
in	O
realism	O
saying	O
,	O
"	O
While	O
enemies	O
died	O
en	O
masse	O
in	O
previous	O
installments	O
,	O
dismemberment	O
and	O
gore	O
were	O
essentially	O
nonexistent	O
.	O
</s>
<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
was	O
the	O
second	O
best-selling	O
game	O
for	O
November	O
2008	O
in	O
the	O
United	O
States	O
,	O
selling	O
over	O
1.41million	O
units	O
.	O
</s>
<s>
The	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
versions	O
were	O
the	O
second	O
and	O
ninth	O
best-selling	O
game	O
of	O
December	O
2008	O
in	O
the	O
United	O
States	O
,	O
selling	O
in	O
excess	O
of	O
1.33	O
million	O
and	O
533,000	O
copies	O
respectively	O
.	O
</s>
<s>
The	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
was	O
the	O
sixth	O
best-selling	O
game	O
of	O
2008	O
,	O
selling	O
in	O
excess	O
of	O
2.75	O
million	O
copies	O
.	O
</s>
<s>
The	B-Operating_System
Wii	I-Operating_System
version	O
ranked	O
as	O
the	O
19th	O
best-selling	O
game	O
and	O
the	O
seventh	O
best-selling	O
Wii	B-Operating_System
game	O
of	O
December	O
2008	O
in	O
the	O
United	O
States	O
.	O
</s>
<s>
It	O
received	O
particular	O
interest	O
in	O
the	O
United	O
Kingdom	O
,	O
where	O
it	O
doubled	O
the	O
amount	O
of	O
first-week	O
sales	O
compared	O
to	O
Modern	O
Warfare	O
on	O
the	B-Operating_System
PS3	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
.	O
</s>
<s>
It	O
also	O
became	O
the	O
third	O
fastest-selling	O
video	O
game	O
in	O
the	O
UK	O
behind	O
Grand	B-Application
Theft	I-Application
Auto	I-Application
IV	I-Application
and	O
Grand	B-Application
Theft	I-Application
Auto	I-Application
:	I-Application
San	I-Application
Andreas	I-Application
.	O
</s>
<s>
The	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
of	O
World	O
at	O
War	O
received	O
a	O
"	O
Double	O
Platinum	O
"	O
sales	O
award	O
from	O
the	O
Entertainment	O
and	O
Leisure	O
Software	O
Publishers	O
Association	O
(	O
ELSPA	O
)	O
,	O
indicating	O
sales	O
of	O
at	O
least	O
600,000	O
copies	O
in	O
the	O
United	O
Kingdom	O
.	O
</s>
<s>
ELSPA	O
gave	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
release	O
a	O
"	O
Platinum	O
"	O
certification	O
for	O
sales	O
of	O
at	O
least	O
300,000	O
copies	O
in	O
the	O
region	O
.	O
</s>
