<s>
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
Black	I-Application
Ops	I-Application
–	I-Application
Zombies	I-Application
is	O
a	O
spin-off	O
game	O
of	O
the	O
Call	B-Application
of	I-Application
Duty	I-Application
series	O
 '	O
Zombies	O
mode	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
–	I-Application
Zombies	I-Application
.	O
</s>
<s>
Developed	O
by	O
Ideaworks	O
Game	O
Studio	O
and	O
published	O
by	O
Activision	O
for	O
the	O
iOS	B-Application
and	O
Android	B-Application
platforms	I-Application
,	O
it	O
was	O
launched	O
in	O
select	O
countries	O
on	O
December	O
1	O
,	O
2011	O
.	O
</s>
<s>
It	O
is	O
the	O
sequel	O
to	O
the	O
popular	O
mode	O
on	O
Call	B-Application
of	I-Application
Duty	I-Application
:	I-Application
World	I-Application
at	I-Application
War	I-Application
,	O
the	O
fifth	O
title	O
in	O
the	O
Call	B-Application
of	I-Application
Duty	I-Application
series	O
.	O
</s>
<s>
The	O
game	O
allows	O
two	O
-	O
to	O
four-player	O
co-op	O
multiplayer	O
,	O
and	O
,	O
as	O
a	O
new	O
addition	O
to	O
the	O
iOS	B-Application
platform	O
,	O
voice	O
chat	O
and	O
another	O
new	O
feature	O
-	O
to	O
crouch	O
and	O
full	O
prone	O
-	O
a	O
first	O
for	O
all	O
iOS	B-Application
first-person	O
shooters	O
.	O
</s>
<s>
The	O
first	O
map	O
released	O
was	O
Kino	B-Application
der	I-Application
Toten	I-Application
.	O
</s>
<s>
Dead	O
Ops	O
Arcade	O
has	O
also	O
been	O
fully	O
transformed	O
to	O
the	O
iOS	B-Application
platform	O
,	O
with	O
50	O
levels	O
,	O
and	O
the	O
player	O
is	O
able	O
to	O
select	O
and	O
play	O
as	O
one	O
of	O
the	O
four	O
characters	O
from	O
the	O
console	O
version	O
(	O
Tank	O
Dempsey	O
,	O
Nikolai	O
Belinski	O
,	O
Takeo	O
Masaki	O
and	O
Doctor	O
Edward	O
Richtofen	O
)	O
or	O
as	O
one	O
of	O
the	O
four	O
random	O
characters	O
from	O
Dead	O
Ops	O
Arcade	O
and	O
a	O
"	O
rookie	O
"	O
soldier	O
in	O
the	O
tutorial	O
.	O
</s>
<s>
Kino	B-Application
der	I-Application
Toten	I-Application
is	O
much	O
like	O
its	O
console/PC	O
counterparts	O
with	O
the	O
exception	O
that	O
its	O
central	O
stairway	O
has	O
been	O
changed	O
to	O
two	O
ramps	O
that	O
go	O
in	O
two	O
directions	O
and	O
meet	O
back	O
up	O
.	O
</s>
<s>
Along	O
the	O
return	O
of	O
the	O
three	O
and	O
done	O
pack	O
a	O
punch	O
process	O
,	O
new	O
perks	O
(	O
including	O
Stamin-up	O
and	O
PHD	O
flopper	O
)	O
,	O
and	O
new	O
tactical	O
grenades	O
such	O
as	O
the	O
matryoshka	O
dolls	O
later	O
used	O
in	O
"	O
Call	O
of	O
the	O
Dead	O
"	O
and	O
the	O
Gersh	O
devices	O
that	O
later	O
appeared	O
on	O
"	O
Moon	O
"	O
in	O
both	O
Black	B-Application
Ops	I-Application
,	O
Black	B-Application
Ops	I-Application
3	I-Application
,	O
and	O
under	O
the	O
name	O
of	O
the	O
Krazny	O
device	O
in	O
Cold	O
War	O
zombies	O
.	O
</s>
<s>
The	O
iOS	B-Application
version	O
received	O
above-average	O
reviews	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
