<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
is	O
a	O
2010	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
worldwide	O
in	O
November	O
2010	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
,	O
and	O
Xbox	B-Operating_System
360	I-Operating_System
,	O
with	O
a	O
separate	O
version	O
for	O
Nintendo	B-Device
DS	I-Device
developed	O
by	O
n-Space	O
.	O
</s>
<s>
Aspyr	O
later	O
released	O
the	O
game	O
for	O
OS	B-Operating_System
X	I-Operating_System
in	O
September	O
2012	O
.	O
</s>
<s>
It	O
is	O
the	O
seventh	O
title	O
in	O
the	O
Call	B-Application
of	I-Application
Duty	I-Application
series	O
and	O
the	O
sequel	O
to	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
.	O
</s>
<s>
Set	O
in	O
the	O
1960s	O
during	O
the	O
Cold	B-Application
War	I-Application
,	O
the	O
game	O
's	O
campaign	O
follows	O
CIA	O
operative	O
Alex	O
Mason	O
as	O
he	O
attempts	O
to	O
recall	O
certain	O
memories	O
of	O
combat	O
to	O
locate	O
a	O
numbers	O
station	O
.	O
</s>
<s>
It	O
runs	O
an	O
enhanced	O
version	O
of	O
the	O
IW	B-Application
3.0	I-Application
engine	O
used	O
in	O
World	B-Application
at	I-Application
War	I-Application
.	O
</s>
<s>
Treyarch	O
focused	O
specifically	O
on	O
Black	O
Ops	O
during	O
development	O
;	O
they	O
were	O
developing	O
two	O
games	O
at	O
once	O
while	O
making	O
World	B-Application
at	I-Application
War	I-Application
.	O
</s>
<s>
Among	O
other	O
awards	O
and	O
nominations	O
,	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
was	O
nominated	O
Game	O
of	O
the	O
Year	O
by	O
numerous	O
media	O
outlets	O
and	O
award	O
shows	O
,	O
including	O
the	O
Interactive	O
Achievement	O
Awards	O
,	O
British	O
Academy	O
Games	O
Awards	O
,	O
and	O
Spike	O
Video	O
Game	O
Awards	O
.	O
</s>
<s>
Within	O
24	O
hours	O
of	O
going	O
on	O
sale	O
,	O
the	O
game	O
had	O
sold	O
more	O
than	O
5.6	O
million	O
copies	O
,	O
breaking	O
the	O
record	O
set	O
by	O
its	O
predecessor	O
Modern	B-Application
Warfare	I-Application
2	I-Application
by	O
some	O
2.3	O
million	O
copies	O
.	O
</s>
<s>
The	O
game	O
had	O
sold	O
over	O
25	O
million	O
copies	O
worldwide	O
,	O
making	O
it	O
one	O
of	O
the	O
best-selling	B-Application
games	I-Application
of	I-Application
all	I-Application
time	I-Application
.	O
</s>
<s>
A	O
sequel	O
,	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
II	I-Application
,	O
was	O
released	O
in	O
2012	O
.	O
</s>
<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
Cold	I-Application
War	I-Application
,	O
set	O
between	O
Black	O
Ops	O
and	O
Black	B-Application
Ops	I-Application
II	I-Application
,	O
was	O
released	O
in	O
November	O
2020	O
.	O
</s>
<s>
Black	O
Ops	O
is	O
a	O
first-person	O
shooter	O
,	O
retaining	O
the	O
same	O
gameplay	O
mechanics	O
as	O
previous	O
Call	B-Application
of	I-Application
Duty	I-Application
titles	O
.	O
</s>
<s>
The	O
player	O
assumes	O
the	O
role	O
of	O
a	O
foot	B-Protocol
soldier	I-Protocol
who	O
can	O
wield	O
various	O
firearms	O
(	O
only	O
two	O
of	O
which	O
can	O
be	O
carried	O
at	O
once	O
)	O
,	O
throw	O
grenades	O
and	O
other	O
explosives	O
,	O
and	O
use	O
other	O
equipment	O
as	O
weapons	O
.	O
</s>
<s>
When	O
the	O
character	O
is	O
within	O
the	O
blast	B-Device
radius	I-Device
of	O
a	O
live	O
grenade	O
,	O
an	O
on-screen	O
marker	O
indicates	O
where	O
it	O
is	O
in	O
relation	O
to	O
the	O
player	O
,	O
helping	O
the	O
player	O
to	O
move	O
away	O
or	O
to	O
throw	O
it	O
back	O
.	O
</s>
<s>
Among	O
the	O
weapons	O
new	O
to	O
the	O
series	O
in	O
Black	O
Ops	O
are	O
crossbows	B-Application
with	O
bolts	O
and	O
explosive	O
ammunition	O
,	O
Dragon	O
's	O
Breath	O
rounds	O
and	O
ballistic	O
knives	O
.	O
</s>
<s>
Black	O
Ops	O
retains	O
the	O
experience	O
points	O
and	O
unlockable	O
reward	O
system	O
that	O
has	O
been	O
kept	O
since	O
Call	B-Application
of	I-Application
Duty	I-Application
4	O
.	O
</s>
<s>
Players	O
can	O
play	O
alone	O
or	O
with	O
friends	O
against	O
AI	B-Application
opponents	O
in	O
"	O
Combat	O
Training	O
"	O
with	O
a	O
separate	O
progression	O
system	O
.	O
</s>
<s>
Online	O
split-screen	O
is	O
re-introduced	O
on	O
Xbox	B-Operating_System
360	I-Operating_System
and	O
PS3	B-Operating_System
.	O
</s>
<s>
Only	O
on	O
Xbox	B-Operating_System
360	I-Operating_System
,	O
a	O
second	O
Gold	O
Xbox	B-Application
Live	I-Application
account	O
can	O
be	O
used	O
to	O
keep	O
the	O
second	O
player	O
's	O
progression	O
.	O
</s>
<s>
Aside	O
from	O
the	O
Combat	O
Training	O
mode	O
,	O
Xbox	B-Operating_System
users	O
can	O
also	O
have	O
up	O
to	O
four	O
players	O
in	O
split-screen	O
mode	O
play	O
against	O
AI	B-Application
opponents	O
even	O
without	O
having	O
an	O
Xbox	B-Application
Live	I-Application
account	O
.	O
</s>
<s>
Some	O
specific	O
features	O
that	O
have	O
been	O
removed	O
from	O
the	O
PC	B-Device
version	O
of	O
Infinity	O
Ward	O
's	O
Modern	B-Application
Warfare	I-Application
2	I-Application
return	O
,	O
such	O
as	O
lean	O
,	O
mod	O
tools	O
,	O
the	O
developer	O
console	O
,	O
and	O
dedicated	O
servers	O
.	O
</s>
<s>
Steam	B-Application
is	O
the	O
exclusive	O
platform	O
for	O
Black	O
Ops	O
on	O
PC	B-Device
,	O
and	O
the	O
game	O
is	O
protected	O
by	O
Valve	B-Application
Anti-Cheat	I-Application
.	O
</s>
<s>
The	B-Operating_System
Wii	I-Operating_System
version	O
of	O
the	O
game	O
includes	O
in-game	O
voice	O
chat	O
.	O
</s>
<s>
This	O
is	O
the	O
first	O
Call	B-Application
of	I-Application
Duty	I-Application
title	O
to	O
include	O
the	O
voice	O
chat	O
feature	O
for	O
the	B-Operating_System
Wii	I-Operating_System
.	O
</s>
<s>
Nintendo	O
and	O
PDP	O
have	O
partnered	O
to	O
release	O
the	O
first	O
headset	O
to	O
be	O
used	O
with	O
the	B-Operating_System
Wii	I-Operating_System
known	O
as	O
PDP	O
's	O
Headbanger	O
Headset	O
.	O
</s>
<s>
Originally	O
featured	O
in	O
World	B-Application
at	I-Application
War	I-Application
,	O
it	O
was	O
revamped	O
to	O
be	O
included	O
in	O
Black	O
Ops	O
.	O
</s>
<s>
The	O
game	O
features	O
three	O
maps	O
,	O
"	O
Five	O
"	O
,	O
Kino	B-Application
Der	I-Application
Toten	I-Application
,	O
and	O
the	O
unlockable	O
Dead	O
Ops	O
Arcade	O
.	O
</s>
<s>
Kino	B-Application
Der	I-Application
Toten	I-Application
takes	O
place	O
in	O
an	O
abandoned	O
Group	O
935	O
facility	O
located	O
within	O
a	O
theater	O
in	O
Berlin	O
during	O
1963	O
.	O
</s>
<s>
The	O
playable	O
characters	O
in	O
this	O
map	O
return	O
from	O
the	O
World	B-Application
at	I-Application
War	I-Application
Zombies	I-Application
mode	O
:	O
Edward	O
Richtofen	O
,	O
a	O
mad	O
German	O
scientist	O
,	O
Takeo	O
Masaki	O
,	O
an	O
officer	O
of	O
the	O
Imperial	O
Japanese	O
Army	O
,	O
Nikolai	O
Belinski	O
,	O
a	O
Red	O
Army	O
soldier	O
,	O
and	O
Tank	O
Dempsey	O
,	O
a	O
Marine	O
from	O
the	O
United	O
States	O
.	O
</s>
<s>
Dead	O
Ops	O
Arcade	O
includes	O
co-op	O
playthrough	O
through	O
either	O
Xbox	B-Application
Live	I-Application
or	O
split	O
screen	O
of	O
up	O
to	O
4	O
players	O
.	O
</s>
<s>
Black	O
Ops	O
takes	O
place	O
between	O
1961	O
and	O
1968	O
during	O
both	O
the	O
Cold	B-Application
War	I-Application
and	O
the	O
Vietnam	O
War	O
,	O
16	O
years	O
to	O
23	O
years	O
after	O
the	O
events	O
of	O
World	B-Application
at	I-Application
War	I-Application
.	O
</s>
<s>
Missions	O
take	O
place	O
in	O
various	O
locations	O
around	O
the	O
globe	O
,	O
such	O
as	O
the	O
Ural	O
Mountains	O
,	O
Kazakhstan	O
,	O
Cuba	O
,	O
Hong	O
Kong	O
,	O
Laos	O
,	O
South	O
Vietnam	O
,	O
the	O
Arctic	O
Circle	O
and	O
Siberia	B-Application
.	O
</s>
<s>
The	O
single-player	O
campaign	O
revolves	O
around	O
an	O
experimental	O
nerve	O
agent	O
and	O
chemical	O
weapon	O
codenamed	O
"	O
Nova	B-Application
6	I-Application
"	O
.	O
</s>
<s>
Viktor	O
Reznov	O
(	O
Gary	O
Oldman	O
)	O
,	O
a	O
key	O
character	O
from	O
the	O
Soviet	O
campaign	O
in	O
World	B-Application
at	I-Application
War	I-Application
,	O
returns	O
along	O
with	O
that	O
game	O
's	O
Russian	O
protagonist	O
Dimitri	B-Application
Petrenko	I-Application
(	O
Boris	O
Kievsky	O
)	O
also	O
making	O
an	O
appearance	O
.	O
</s>
<s>
Opposing	O
the	O
CIA	O
are	O
the	O
leaders	O
of	O
Project	O
Nova	O
:	O
former	O
Red	O
Army	O
General	O
Nikita	B-Application
Dragovich	I-Application
(	O
Eamon	O
Hunt	O
)	O
,	O
Colonel	O
Lev	O
Kravchenko	O
(	O
Andrew	O
Divoff	O
)	O
,	O
and	O
former	O
Nazi	O
scientist	O
Doctor	O
Friedrich	O
Steiner	O
(	O
Mark	O
Bramhall	O
)	O
.	O
</s>
<s>
Reznov	O
gives	O
Mason	O
the	O
identities	O
of	O
their	O
enemies	O
:	O
Major	O
General	O
Nikita	B-Application
Dragovich	I-Application
,	O
Colonel	O
Lev	O
Kravchenko	O
,	O
and	O
ex-Nazi	O
scientist	O
Friedrich	O
Steiner	O
,	O
who	O
defected	O
to	O
the	O
Soviet	O
Union	O
.	O
</s>
<s>
In	O
October	O
1945	O
,	O
Reznov	O
,	O
Dimitri	B-Application
Petrenko	I-Application
,	O
and	O
their	O
platoon	O
were	O
sent	O
to	O
extract	O
Steiner	O
from	O
a	O
Nazi	O
base	O
in	O
the	O
Arctic	O
.	O
</s>
<s>
However	O
,	O
they	O
were	O
betrayed	O
by	O
Dragovich	O
,	O
who	O
tested	O
Steiner	O
's	O
nerve	O
gas	O
"	O
Nova	B-Application
6	I-Application
"	O
on	O
Petrenko	O
and	O
his	O
squad	O
,	O
killing	O
them	O
.	O
</s>
<s>
Reznov	O
was	O
spared	O
when	O
British	O
commandos	O
,	O
interested	O
in	O
acquiring	O
Nova	B-Application
6	I-Application
,	O
attacked	O
.	O
</s>
<s>
He	O
destroyed	O
Nova	B-Application
6	I-Application
and	O
escaped	O
,	O
only	O
to	O
be	O
captured	O
by	O
the	O
Soviets	O
and	O
sent	O
to	O
Vorkutlag	O
.	O
</s>
<s>
The	O
Soviets	O
later	O
recreated	O
Nova	B-Application
6	I-Application
using	O
British	O
scientist	O
Daniel	O
Clarke	O
.	O
</s>
<s>
After	O
Dragovich	O
resurfaces	O
,	O
they	O
penetrate	O
Laos	O
to	O
recover	O
a	O
Nova	B-Application
6	I-Application
shipment	O
from	O
a	O
downed	O
Soviet	O
plane	O
.	O
</s>
<s>
Dragovich	O
has	O
sleeper	O
cells	O
placed	O
within	O
each	O
State	O
capital	O
,	O
which	O
,	O
when	O
ordered	O
by	O
a	O
broadcast	O
of	O
the	O
numbers	O
from	O
his	O
station	O
,	O
will	O
release	O
Nova	B-Application
6	I-Application
.	O
</s>
<s>
In	O
response	O
,	O
the	O
U.S.	O
,	O
now	O
at	O
DEFCON	B-Application
2	I-Application
,	O
is	O
preparing	O
a	O
pre-emptive	O
nuclear	O
strike	O
on	O
the	O
Soviet	O
Union	O
.	O
</s>
<s>
Maxis	O
and	O
his	O
assistant	O
,	O
Dr.	O
Edward	O
Richtofen	O
,	O
also	O
work	O
on	O
other	O
projects	O
,	O
leading	O
to	O
the	O
creation	O
of	O
teleportation	B-General_Concept
devices	O
and	O
115-powered	O
weapons	O
.	O
</s>
<s>
Maxis	O
continues	O
his	O
work	O
on	O
other	O
experiments	O
,	O
attempting	O
to	O
use	O
his	O
daughter	O
's	O
dog	O
,	O
Fluffy	O
,	O
as	O
a	O
test	O
subject	O
for	O
his	O
own	O
teleportation	B-General_Concept
device	O
.	O
</s>
<s>
After	O
freeing	O
Gersh	O
,	O
the	O
four	O
of	O
them	O
are	O
teleported	O
further	O
in	O
time	O
and	O
arrive	O
at	O
a	O
Siberian	B-Application
lighthouse	O
sometime	O
in	O
2011	O
,	O
once	O
used	O
by	O
Richtofen	O
as	O
a	O
secret	O
lab	O
.	O
</s>
<s>
Maxis	O
is	O
revealed	O
to	O
have	O
become	O
a	O
sentient	O
artificial	B-Application
intelligence	I-Application
living	O
within	O
the	O
systems	O
of	O
Griffin	O
Station	O
,	O
and	O
he	O
guides	O
his	O
daughter	O
and	O
the	O
three	O
soldiers	O
to	O
launch	O
three	O
missiles	O
at	O
the	O
Earth	O
.	O
</s>
<s>
In	O
May	O
2009	O
,	O
publisher	O
Activision	O
was	O
rumored	O
to	O
be	O
looking	O
for	O
licensing	O
regarding	O
Vietnam	O
War-era	O
music	O
which	O
led	O
to	O
speculation	O
that	O
Call	B-Application
of	I-Application
Duty	I-Application
7	I-Application
would	O
be	O
set	O
in	O
Vietnam	O
.	O
</s>
<s>
In	O
May	O
2009	O
,	O
Treyarch	O
employee	O
David	O
Kim	O
revealed	O
on	O
his	O
LinkedIn	B-Application
profile	O
that	O
he	O
would	O
work	O
as	O
a	O
senior	O
animator	O
on	O
Call	B-Application
of	I-Application
Duty	I-Application
7	I-Application
.	O
</s>
<s>
In	O
November	O
2009	O
,	O
only	O
a	O
few	O
days	O
before	O
Modern	B-Application
Warfare	I-Application
2s	I-Application
release	O
,	O
Activision	O
officially	O
announced	O
a	O
new	O
Call	B-Application
of	I-Application
Duty	I-Application
title	O
for	O
2010	O
through	O
their	O
third	O
quarter	O
financial	O
call	O
.	O
</s>
<s>
In	O
February	O
2010	O
,	O
a	O
casting	O
call	O
for	O
Call	B-Application
of	I-Application
Duty	I-Application
7	I-Application
led	O
to	O
speculation	O
that	O
the	O
game	O
would	O
be	O
taking	O
place	O
during	O
the	O
Cold	B-Application
War	I-Application
era	O
with	O
some	O
battles	O
taking	O
place	O
in	O
South	O
Vietnam	O
.	O
</s>
<s>
The	O
game	O
runs	O
on	O
an	O
enhanced	O
World	B-Application
at	I-Application
War	I-Application
engine	O
(	O
which	O
itself	O
was	O
improved	O
from	O
Call	B-Application
of	I-Application
Duty	I-Application
4	O
)	O
at	O
60	O
frames	O
per	O
second	O
across	O
all	O
platforms	O
,	O
excluding	O
the	B-Operating_System
Wii	I-Operating_System
.	O
</s>
<s>
It	O
features	O
a	O
streaming	O
texture	O
technology	O
(	O
also	O
seen	O
in	O
Modern	B-Application
Warfare	I-Application
2	I-Application
)	O
,	O
making	O
bigger	O
levels	O
possible	O
such	O
as	O
"	O
Payback	O
"	O
where	O
the	O
player	O
controls	O
a	O
helicopter	O
.	O
</s>
<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
supports	O
3-D	B-Algorithm
imaging	I-Algorithm
rendered	O
by	O
the	O
engine	O
itself	O
.	O
</s>
<s>
This	O
feature	O
is	O
available	O
on	O
the	O
PC	B-Device
,	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
and	O
Xbox	B-Operating_System
360	I-Operating_System
versions	O
.	O
</s>
<s>
Treyarch	O
used	O
a	O
motion	B-Application
capture	I-Application
technology	O
similar	O
to	O
the	O
one	O
used	O
in	O
James	O
Cameron	O
's	O
film	O
Avatar	O
,	O
which	O
allows	O
accurate	O
facial	O
expressions	O
,	O
capturing	O
the	O
whole	O
performance	O
of	O
the	O
actor	O
.	O
</s>
<s>
The	O
studio	O
also	O
consulted	O
special	O
forces	O
veterans	O
from	O
both	O
belligerents	O
of	O
the	O
Cold	B-Application
War	I-Application
:	O
Major	O
John	O
Plaster	O
(	O
US	O
Army-Ret	O
.	O
)	O
</s>
<s>
Spetsnaz	O
AIs	B-Application
in	O
the	O
game	O
have	O
been	O
modeled	O
after	O
him	O
,	O
from	O
his	O
tactics	O
and	O
his	O
movements	O
to	O
his	O
face	O
.	O
</s>
<s>
Although	O
having	O
a	O
historical	O
background	O
,	O
the	O
classified	O
aspect	O
of	O
these	O
Cold	B-Application
War	I-Application
black	O
operations	O
allowed	O
the	O
studio	O
to	O
create	O
its	O
own	O
fictional	O
story	O
.	O
</s>
<s>
It	O
was	O
announced	O
on	O
November	O
9	O
,	O
2015	O
,	O
that	O
Black	O
Ops	O
would	O
become	O
backwards	O
compatible	O
with	O
the	B-Device
Xbox	I-Device
One	I-Device
.	O
</s>
<s>
Black	O
Ops	O
was	O
originally	O
the	O
sixth-most	O
requested	O
Xbox	B-Operating_System
360	I-Operating_System
title	O
to	O
become	O
backwards	O
compatible	O
with	O
the	B-Device
Xbox	I-Device
One	I-Device
.	O
</s>
<s>
On	O
May	O
17	O
,	O
2016	O
,	O
the	O
game	O
was	O
made	O
available	O
through	O
Xbox	B-Device
One	I-Device
's	O
backward	O
compatibility	O
.	O
</s>
<s>
Shortly	O
after	O
,	O
it	O
was	O
reported	O
that	O
sales	O
of	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
had	O
increased	O
by	O
13,000	O
percent	O
.	O
</s>
<s>
Black	O
Ops	O
features	O
the	O
voices	O
of	O
Sam	O
Worthington	O
as	O
Alex	O
Mason	O
,	O
Ed	O
Harris	O
as	O
Jason	O
Hudson	O
,	O
Gary	O
Oldman	O
reprises	O
his	O
role	O
as	O
Viktor	O
Reznov	O
from	O
World	B-Application
at	I-Application
War	I-Application
and	O
also	O
voices	O
Dr.	O
Clarke	O
,	O
James	O
C	O
.	O
Burns	O
voices	O
and	O
provides	O
performance	B-Application
capture	I-Application
for	O
Frank	O
Woods	O
and	O
Ice	O
Cube	O
voices	O
Joseph	O
Bowman	O
,	O
whose	O
appearance	O
is	O
likened	O
to	O
him	O
as	O
well	O
,	O
and	O
is	O
also	O
the	O
multiplayer	O
announcer	O
for	O
the	O
SOG	O
faction	O
.	O
</s>
<s>
Gene	O
Farber	O
voices	O
Grigori	O
Weaver	O
,	O
Emmanuelle	O
Chriqui	O
plays	O
a	O
live-action	O
character	O
called	O
Numbers	O
,	O
Eamon	O
Hunt	O
voices	O
Nikita	B-Application
Dragovich	I-Application
,	O
Andrew	O
Divoff	O
voices	O
Lev	O
Kravchenko	O
and	O
Robert	O
Picardo	O
voices	O
Secretary	O
Robert	O
McNamara	O
.	O
</s>
<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
features	O
Vietnam	O
War	O
era	O
music	O
including	O
"	O
Sympathy	O
for	O
the	O
Devil	O
"	O
by	O
The	O
Rolling	O
Stones	O
(	O
played	O
during	O
a	O
gameplay	O
sequence	O
,	O
the	O
credits	O
,	O
and	O
as	O
an	O
easter	O
egg	O
in	O
the	O
multiplayer	O
map	O
Nuketown	O
)	O
and	O
Creedence	O
Clearwater	O
Revival	O
's	O
"	O
Fortunate	O
Son	O
"	O
.	O
</s>
<s>
The	O
original	O
music	O
was	O
composed	O
by	O
Sean	O
Murray	O
,	O
who	O
also	O
composed	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
while	O
Kevin	O
Sherwood	O
composed	O
music	O
for	O
the	O
Zombies	O
mode	O
.	O
</s>
<s>
"	O
Gimme	O
Shelter	O
"	O
sold	O
2,000	O
copies	O
in	O
the	O
week	O
before	O
the	O
launch	O
trailer	O
was	O
revealed	O
,	O
5,000	O
the	O
week	O
after	O
,	O
and	O
11,000	O
the	O
week	O
after	O
the	O
game	O
's	O
release	O
.	O
</s>
<s>
In	O
early	O
April	O
2010	O
,	O
an	O
unmarked	O
envelope	O
was	O
sent	O
to	O
various	O
gaming	O
news	O
publications	O
as	O
well	O
as	O
high-profile	O
Call	B-Application
of	I-Application
Duty	I-Application
fans	O
via	O
mail	O
.	O
</s>
<s>
Similarly	O
to	O
Modern	B-Application
Warfare	I-Application
2s	I-Application
marketing	O
,	O
the	O
first	O
full-length	O
trailer	O
of	O
Black	O
Ops	O
was	O
aired	O
after	O
the	O
3rd	O
quarter	O
on	O
ESPN	O
during	O
the	O
NBA	O
Eastern	O
Conference	O
Finals	O
on	O
May	O
18	O
,	O
2010	O
.	O
</s>
<s>
It	O
was	O
also	O
announced	O
that	O
the	O
timed	O
Xbox	B-Operating_System
360	I-Operating_System
exclusivity	O
for	O
additional	O
content	O
of	O
Call	B-Application
of	I-Application
Duty	I-Application
titles	O
,	O
which	O
began	O
with	O
Modern	B-Application
Warfare	I-Application
2	I-Application
,	O
extends	O
until	O
2012	O
.	O
</s>
<s>
Chrysler	O
produced	O
a	O
limited-edition	O
Call	B-Application
of	I-Application
Duty	I-Application
Jeep	O
as	O
the	O
Wrangler	O
is	O
featured	O
in	O
Black	O
Ops	O
.	O
</s>
<s>
On	O
October	O
11	O
,	O
a	O
single	O
player	O
trailer	O
aired	O
on	O
ESPN	O
during	O
the	O
New	O
York	O
Jets	O
versus	O
Minnesota	O
Vikings	O
NFL	B-Application
Monday	O
Night	O
Football	O
game	O
.	O
</s>
<s>
The	O
same	O
trailer	O
aired	O
on	O
October	O
31	O
during	O
the	O
New	O
Orleans	O
Saints	O
versus	O
Pittsburgh	O
Steelers	O
NFL	B-Application
Sunday	O
Night	O
Football	O
game	O
.	O
</s>
<s>
Like	O
Modern	B-Application
Warfare	I-Application
2	I-Application
,	O
"	O
Hardened	O
"	O
and	O
"	O
Prestige	O
"	O
limited	O
editions	O
are	O
available	O
:	O
the	O
Hardened	O
Edition	O
includes	O
a	O
SteelBook	O
case	O
,	O
a	O
medal	O
with	O
its	O
display	O
case	O
,	O
four	O
exclusive	O
co-op	O
levels	O
and	O
an	O
Xbox	B-Application
Live	I-Application
or	O
PlayStation	B-Protocol
Home	I-Protocol
avatar	O
outfit	O
.	O
</s>
<s>
The	O
Prestige	O
Edition	O
offers	O
,	O
in	O
addition	O
to	O
the	O
Hardened	O
Edition	O
's	O
content	O
,	O
a	O
real	O
RC-XD	B-Application
remote-control	O
vehicle	O
modeled	O
after	O
the	O
in-game	O
killstreak	O
reward	O
,	O
which	O
gives	O
video	O
and	O
audio	O
feedback	O
to	O
its	O
controller	O
.	O
</s>
<s>
Treyarch	O
released	O
the	O
"	O
First	O
Strike	O
"	O
Map	O
Pack	O
on	O
February	O
1	O
,	O
2011	O
,	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
.	O
</s>
<s>
The	O
PlayStation	B-Operating_System
3	I-Operating_System
received	O
the	O
map	O
pack	O
on	O
March	O
3	O
,	O
2011	O
,	O
and	O
the	O
PC	B-Device
version	O
was	O
released	O
on	O
March	O
25	O
,	O
2011	O
,	O
through	O
Steam	B-Application
.	O
</s>
<s>
It	O
was	O
released	O
on	O
May	O
3	O
,	O
2011	O
,	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
,	O
June	O
2	O
on	O
the	O
PC	B-Device
and	O
June	O
10	O
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
.	O
</s>
<s>
A	O
third	O
map	O
pack	O
called	O
"	O
Annihilation	O
"	O
was	O
released	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
on	O
June	O
28	O
,	O
2011	O
,	O
and	O
on	O
July	O
28	O
,	O
2011	O
,	O
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
PC	B-Device
.	O
</s>
<s>
The	O
fourth	O
map	O
pack	O
,	O
"	O
Rezurrection	O
"	O
was	O
released	O
on	O
August	O
23	O
,	O
2011	O
,	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
,	O
and	O
September	O
22	O
,	O
2011	O
,	O
on	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
PC	B-Device
.	O
</s>
<s>
The	O
Rezurrection	O
Map	O
Pack	O
is	O
made	O
up	O
of	O
5	B-Application
Zombies	O
mode	O
only	O
maps	O
.	O
</s>
<s>
It	O
includes	O
the	O
first	O
4	O
maps	O
from	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
(	O
"	O
Shi	O
No	O
Numa	O
"	O
/	O
"	O
Swamp	O
"	O
,	O
"	O
Nacht	B-Application
Der	I-Application
Untoten	I-Application
"	O
/	O
"	O
Night	O
"	O
,	O
"	O
Verruckt	O
"	O
/	O
"	O
Asylum	O
"	O
,	O
"	O
Der	O
Riese	O
"	O
/	O
"	O
Factory	O
"	O
)	O
fully	O
remastered	O
.	O
</s>
<s>
"	O
Moon	O
"	O
allows	O
players	O
to	O
fight	O
zombies	O
in	O
zero	B-Application
gravity	I-Application
with	O
both	O
the	O
player	O
and	O
the	O
zombies	O
under	O
zero	B-Application
gravity	I-Application
influence	O
.	O
</s>
<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	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
except	O
for	O
the	O
DS	B-Device
,	O
where	O
it	O
received	O
"	O
mixed	O
or	O
average	O
"	O
reviews	O
.	O
</s>
<s>
GameSpot	O
awarded	O
it	O
9.0	O
out	O
of	O
ten	O
and	O
wrote	O
"	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
bears	O
the	O
series	O
 '	O
standard	O
superbly	O
,	O
delivering	O
an	O
engrossing	O
campaign	O
and	O
exciting	O
competitive	O
multiplayer.	O
"	O
</s>
<s>
Several	O
reviewers	O
also	O
complained	O
that	O
the	O
game	O
felt	O
too	O
much	O
like	O
a	O
rail	O
shooter	O
,	O
with	O
PC	B-Device
Gamer	O
branding	O
it	O
"	O
barely	O
interactive	O
"	O
.	O
</s>
<s>
Reviewers	O
also	O
noted	O
that	O
the	O
PC	B-Device
version	O
of	O
the	O
game	O
was	O
buggy	O
and	O
had	O
"	O
a	O
number	O
of	O
frustrating	O
problems	O
"	O
,	O
including	O
a	O
lag	O
in	O
multiplayer	O
modes	O
which	O
for	O
some	O
players	O
rendered	O
the	O
game	O
almost	O
"	O
unplayable	O
"	O
.	O
</s>
<s>
Players	O
have	O
also	O
reported	O
serious	O
bugs	O
with	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
version	O
,	O
including	O
compatibility	O
issues	O
with	O
3D	B-Algorithm
televisions	I-Algorithm
.	O
</s>
<s>
PC	B-Device
World	O
magazine	O
noted	O
that	O
user	O
reviews	O
of	O
the	O
game	O
were	O
much	O
less	O
positive	O
than	O
those	O
of	O
critics	O
.	O
</s>
<s>
As	O
of	O
November	O
12	O
,	O
2010	O
,	O
three	O
days	O
after	O
the	O
release	O
,	O
PC	B-Device
,	O
PS3	B-Operating_System
,	O
and	O
Xbox	B-Operating_System
360	I-Operating_System
versions	O
of	O
the	O
game	O
held	O
average	O
user	O
ratings	O
of	O
3.1	O
,	O
3.1	O
,	O
and	O
1.8	O
stars	O
on	O
Amazon.com,	O
respectively	O
(	O
on	O
a	O
1	O
to	O
5	B-Application
scale	O
)	O
,	O
with	O
many	O
PC	B-Device
users	O
complaining	O
about	O
lag	O
,	O
stuttering	O
and	O
bugs	O
.	O
</s>
<s>
In	O
January	O
2011	O
,	O
to	O
a	O
player	O
complaining	O
about	O
the	O
remaining	O
connection	O
problems	O
for	O
the	O
game	O
on	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
an	O
Activision	O
customer	O
service	O
representative	O
threatened	O
that	O
they	O
could	O
shut	O
down	O
the	O
servers	O
for	O
the	O
game	O
for	O
the	O
PlayStation	O
Network	O
at	O
any	O
time	O
.	O
</s>
<s>
Official	O
Nintendo	O
Magazine	O
awarded	O
the	B-Operating_System
Wii	I-Operating_System
version	O
90%	O
and	O
said	O
"	O
Black	O
Ops	O
on	O
Wii	B-Operating_System
is	O
a	O
fantastic	O
shooter	O
packed	O
with	O
all	O
the	O
features	O
of	O
its	O
HD	O
brothers	O
,	O
with	O
the	O
only	O
exception	O
being	O
split-screen	O
multiplayer.	O
"	O
</s>
<s>
Martin	O
Gaston	O
at	O
VideoGamer.com	O
gave	O
the	B-Operating_System
Wii	I-Operating_System
version	O
6	O
out	O
of	O
10	O
,	O
complaining	O
of	O
Treyarch	O
's	O
reworking	O
of	O
in-game	O
sequences	O
as	O
movies	O
,	O
poor	O
AI	B-Application
,	O
and	O
gameplay	O
problems	O
from	O
lower-resolution	O
graphics	O
.	O
</s>
<s>
In	O
February	O
2011	O
,	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
was	O
named	O
the	O
Xbox	B-Application
Live	I-Application
's	O
top	O
title	O
of	O
2010	O
by	O
GameSpot	O
.	O
</s>
<s>
Awards	O
)	O
,	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
was	O
nominated	O
for	O
"	O
Game	O
of	O
the	O
Year	O
"	O
,	O
"	O
Action	O
Game	O
of	O
the	O
Year	O
"	O
,	O
"	O
Outstanding	O
Achievement	O
in	O
Animation	O
"	O
,	O
"	O
Outstanding	O
Achievement	O
in	O
Online	O
Gameplay	O
"	O
,	O
and	O
"	O
Outstanding	O
Achievement	O
in	O
Visual	O
Engineering	O
"	O
.	O
</s>
<s>
Within	O
24	O
hours	O
of	O
its	O
release	O
,	O
Black	O
Ops	O
had	O
sold	O
4.2	O
million	O
copies	O
in	O
the	O
U.S.	O
and	O
1.4	O
million	O
copies	O
in	O
the	O
UK	O
,	O
surpassing	O
that	O
of	O
Modern	B-Application
Warfare	I-Application
2	I-Application
and	O
establishing	O
a	O
new	O
record	O
for	O
largest	O
entertainment	O
launch	O
.	O
</s>
<s>
Compared	O
to	O
the	O
much	O
anticipated	O
opening	O
of	O
Harry	B-Application
Potter	I-Application
and	I-Application
the	I-Application
Deathly	I-Application
Hallows	I-Application
–	I-Application
Part	I-Application
1	I-Application
,	O
the	O
game	O
earned	O
more	O
than	O
twice	O
as	O
much	O
as	O
the	O
film	O
,	O
earning	O
$360million	O
.	O
</s>
<s>
Only	O
five	O
days	O
after	O
its	O
release	O
,	O
sales	O
from	O
the	O
game	O
worldwide	O
reached	O
US$650million	O
,	O
surpassing	O
the	O
previous	O
record	O
achieved	O
by	O
Modern	B-Application
Warfare	I-Application
2	I-Application
which	O
earned	O
$550million	O
in	O
five	O
days	O
.	O
</s>
<s>
This	O
would	O
fall	O
about	O
2million	O
copies	O
and	O
$182million	O
short	O
of	O
Modern	B-Application
Warfare	I-Application
2	I-Application
.	O
</s>
<s>
On	O
March	O
3	O
,	O
2011	O
,	O
the	O
news	O
magazine	O
The	O
Hollywood	O
Reporter	O
also	O
reported	O
on	O
the	O
best	B-Application
selling	I-Application
video	I-Application
games	I-Application
ever	I-Application
.	O
</s>
<s>
It	O
announced	O
that	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
was	O
the	O
best-selling	O
game	O
ever	O
in	O
the	O
United	O
States	O
of	O
America	O
.	O
</s>
<s>
Black	O
Ops	O
was	O
the	O
best-selling	B-Application
game	I-Application
of	I-Application
all	I-Application
time	I-Application
in	O
the	O
UK	O
until	O
Grand	B-Application
Theft	I-Application
Auto	I-Application
V	I-Application
overtook	O
it	O
in	O
November	O
2014	O
.	O
</s>
<s>
Black	O
Ops	O
was	O
also	O
released	O
for	O
both	O
mobile	O
phones	O
and	O
smartphones	B-Application
.	O
</s>
