<s>
CastleVille	B-Operating_System
is	O
a	O
defunct	O
social	O
network	O
game	O
made	O
by	O
Zynga	O
's	O
Dallas	B-Application
studio	O
and	O
was	O
released	O
in	O
November	O
2011	O
.	O
</s>
<s>
On	O
launch	O
it	O
had	O
received	O
a	O
million	O
"	O
likes	O
"	O
on	O
Facebook	B-Application
.	I-Application
</s>
<s>
By	O
the	O
end	O
of	O
its	O
first	O
month	O
,	O
it	O
had	O
become	O
the	O
fifth	O
most	O
popular	O
game	O
on	O
Facebook	B-Application
with	O
26.5	O
million	O
players	O
.	O
</s>
<s>
Zynga	O
created	O
a	O
sequel	O
called	O
CastleVille	B-Operating_System
Legends	O
in	O
early	O
2013	O
.	O
</s>
<s>
CastleVille	B-Operating_System
shut	O
down	O
on	O
30	O
April	O
2016	O
.	O
</s>
<s>
The	O
game	O
was	O
produced	O
by	O
Zynga	B-Application
Dallas	I-Application
,	O
(	O
formerly	O
known	O
as	O
Bonfire	O
Studios	O
)	O
,	O
which	O
was	O
purchased	O
by	O
Zynga	O
in	O
October	O
2010	O
for	O
an	O
undisclosed	O
sum	O
.	O
</s>
<s>
It	O
is	O
the	O
Dallas	B-Application
studio	O
's	O
first	O
release	O
under	O
Zynga	O
management	O
,	O
and	O
the	O
first	O
social	O
game	O
to	O
feature	O
its	O
own	O
orchestral	O
and	O
choir	O
soundtrack	O
.	O
</s>
<s>
Storytelling	O
features	O
were	O
brought	O
from	O
The	B-Application
Pioneer	I-Application
Trail	I-Application
(	O
formerly	O
known	O
as	O
FrontierVille	B-Application
)	O
,	O
while	O
CityVille	B-Application
and	O
FarmVille	B-Application
provided	O
the	O
inspiration	O
for	O
city	O
building	O
and	O
self-expression	O
,	O
respectively	O
.	O
</s>
<s>
The	O
game	O
's	O
Creative	O
Director	O
,	O
Bill	O
Jackson	O
,	O
said	O
that	O
it	O
was	O
aimed	O
to	O
be	O
a	O
deep	O
online	O
game	O
like	O
World	B-Protocol
of	I-Protocol
Warcraft	I-Protocol
.	O
</s>
<s>
At	O
launch	O
in	O
November	O
2011	O
,	O
an	O
official	O
page	O
on	O
Facebook	B-Application
for	O
CastleVille	B-Operating_System
had	O
already	O
received	O
a	O
million	O
"	O
likes	O
"	O
.	O
</s>
<s>
It	O
had	O
gained	O
five	O
million	O
players	O
by	O
21	O
November	O
,	O
compared	O
to	O
the	O
top	O
rated	O
game	O
,	O
CityVille	B-Application
,	O
which	O
had	O
only	O
reached	O
3.2	O
million	O
players	O
after	O
five	O
days	O
.	O
</s>
<s>
Within	O
a	O
month	O
,	O
CastleVille	B-Operating_System
was	O
ranked	O
#5	O
on	O
the	O
most	O
popular	O
Facebook	B-Application
games	O
,	O
having	O
accumulated	O
26.5	O
million	O
players	O
.	O
</s>
<s>
Its	O
entry	O
into	O
the	O
top	O
twenty	O
games	O
came	O
at	O
a	O
cost	O
to	O
its	O
own	O
creators	O
:	O
CastleVille	B-Operating_System
forced	O
an	O
older	O
Zynga	O
game	O
,	O
The	B-Application
Pioneer	I-Application
Trail	I-Application
,	O
out	O
of	O
the	O
list	O
.	O
</s>
<s>
Andrew	O
Webster	O
,	O
reviewing	O
CastleVille	B-Operating_System
for	O
Gamezebo	O
,	O
said	O
that	O
the	O
release	O
would	O
n't	O
"	O
revolutionize	O
social	O
gaming	O
"	O
,	O
but	O
because	O
of	O
"	O
arguably	O
the	O
best	O
visual	O
and	O
audio	O
experience	O
on	O
Facebook	B-Application
"	O
,	O
it	O
was	O
still	O
one	O
of	O
the	O
best	O
games	O
on	O
Facebook	B-Application
.	I-Application
</s>
