<s>
Civilization	B-Application
IV	I-Application
(	O
also	O
known	O
as	O
Sid	B-Application
Meier	I-Application
's	I-Application
Civilization	I-Application
IV	I-Application
)	O
is	O
a	O
4X	B-Application
turn-based	O
strategy	B-Application
computer	I-Application
game	I-Application
and	O
the	O
fourth	O
installment	O
of	O
the	O
Civilization	O
series	O
,	O
and	O
designed	O
by	O
Soren	O
Johnson	O
under	O
the	O
direction	O
of	O
Sid	O
Meier	O
and	O
his	O
video	O
game	O
development	O
studio	O
Firaxis	O
Games	O
.	O
</s>
<s>
It	O
was	O
released	O
in	O
North	O
America	O
,	O
Europe	O
,	O
and	O
Australia	O
,	O
between	O
October	O
25	O
and	O
November	O
4	O
,	O
2005	O
,	O
and	O
followed	O
by	O
Civilization	B-Application
V	I-Application
.	O
</s>
<s>
Civilization	B-Application
IV	I-Application
uses	O
the	O
4X	B-Application
empire-building	O
model	O
for	O
turn-based	O
strategy	O
gameplay	O
,	O
in	O
which	O
the	O
player	O
's	O
main	O
objective	O
is	O
to	O
construct	O
a	O
civilization	O
from	O
limited	O
initial	O
resources	O
.	O
</s>
<s>
As	O
with	O
other	O
games	O
in	O
the	O
series	O
,	O
there	O
are	O
by	O
default	O
five	O
objectives	O
the	O
player	O
can	O
pursue	O
in	O
order	O
to	O
finish	O
the	O
game	O
:	O
conquering	O
all	O
other	O
civilizations	O
,	O
controlling	O
a	O
supermajority	O
of	O
the	O
game	O
world	O
's	O
land	O
and	O
population	O
,	O
building	O
and	O
sending	O
the	O
first	O
sleeper	O
ship	O
to	O
the	O
Alpha	B-Application
Centauri	I-Application
star	O
system	O
,	O
increasing	O
the	O
"	O
Culture	O
ratings	O
"	O
of	O
at	O
least	O
three	O
different	O
cities	O
to	O
"	O
legendary	O
"	O
levels	O
,	O
or	O
winning	O
a	O
"	O
World	O
Leader	O
"	O
popularity	O
contest	O
by	O
the	O
United	O
Nations	O
.	O
</s>
<s>
If	O
the	O
time	O
limit	O
for	O
the	O
game	O
is	O
reached	O
and	O
none	O
of	O
the	O
previous	O
goals	O
has	O
been	O
fulfilled	O
by	O
any	O
players	O
including	O
game	B-Application
AI	I-Application
players	O
,	O
the	O
civilization	O
with	O
the	O
highest	O
total	O
game	O
score	O
is	O
declared	O
winner	O
.	O
</s>
<s>
Civilization	B-Application
IV	I-Application
sold	O
over	O
3	O
million	O
copies	O
by	O
2008	O
and	O
won	O
multiple	O
awards	O
,	O
including	O
several	O
Game	O
of	O
the	O
Year	O
awards	O
.	O
</s>
<s>
Two	O
major	O
expansions	O
were	O
released	O
,	O
Civilization	B-Application
IV	I-Application
:	I-Application
Warlords	I-Application
and	O
Civilization	B-Application
IV	I-Application
:	I-Application
Beyond	I-Application
the	I-Application
Sword	I-Application
,	O
as	O
well	O
as	O
the	O
stand-alone	O
expansion	O
pack	O
Civilization	B-Application
IV	I-Application
:	I-Application
Colonization	I-Application
,	O
which	O
were	O
all	O
combined	O
in	O
2009	O
into	O
one	O
release	O
edition	O
titled	O
Sid	B-Application
Meier	I-Application
's	I-Application
Civilization	I-Application
IV	I-Application
:	O
The	O
Complete	O
Edition	O
.	O
</s>
<s>
Civilization	B-Application
IV	I-Application
follows	O
some	O
of	O
the	O
4X	B-Application
model	I-Application
of	O
turn-based	O
strategy	B-Application
games	I-Application
,	O
a	O
genre	O
in	O
which	O
players	O
control	O
an	O
empire	O
and	O
"	O
explore	O
,	O
expand	O
,	O
exploit	O
,	O
and	O
exterminate	O
"	O
,	O
by	O
having	O
the	O
player	O
attempt	O
to	O
lead	O
a	O
modest	O
group	O
of	O
peoples	O
from	O
a	O
base	O
with	O
initially	O
scarce	O
resources	O
into	O
a	O
successful	O
empire	O
or	O
civilization	O
.	O
</s>
<s>
The	O
condition	O
for	O
winning	O
the	O
game	O
is	O
accomplished	O
through	O
one	O
of	O
the	O
five	O
ways	O
:	O
militarily	O
defeating	O
all	O
other	O
civilizations	O
in	O
the	O
game	O
world	O
,	O
controlling	O
over	O
two-thirds	O
of	O
the	O
game	O
world	O
's	O
land	O
and	O
population	O
,	O
building	O
the	O
first	O
spaceship	O
in	O
the	O
Space	O
Age	O
and	O
sending	O
it	O
to	O
Alpha	B-Application
Centauri	I-Application
,	O
having	O
the	O
most	O
dominant	O
Culture	O
ratings	O
over	O
other	O
civilizations	O
,	O
or	O
becoming	O
"	O
World	O
Leader	O
"	O
through	O
the	O
United	O
Nations	O
votes	O
.	O
</s>
<s>
The	O
game	O
can	O
be	O
played	O
in	O
multiple	O
modes	O
:	O
as	O
a	O
single	O
player	O
facing	O
against	O
one	O
or	O
more	O
computer-controlled	B-Application
opponents	I-Application
,	O
in	O
hot	O
seat	O
mode	O
,	O
or	O
through	O
online	O
multiplayer	O
games	O
.	O
</s>
<s>
As	O
with	O
other	O
turn-based	O
strategy	B-Application
video	I-Application
games	I-Application
,	O
the	O
player	O
can	O
customize	O
the	O
look	O
and	O
feel	O
of	O
their	O
game	O
world	O
as	O
well	O
as	O
the	O
difficulty	O
of	O
any	O
game	B-Application
AI	I-Application
players	O
before	O
the	O
game	O
starts	O
.	O
</s>
<s>
Like	O
other	O
strategy	B-Application
games	I-Application
,	O
Civilization	B-Application
IV	I-Application
has	O
a	O
fog	O
of	O
war	O
feature	O
,	O
in	O
which	O
unexplored	O
territory	O
remains	O
darkened	O
and	O
territories	O
without	O
any	O
units	O
stationed	O
on	O
its	O
designated	O
square	O
is	O
shaded	O
with	O
darker	O
colors	O
.	O
</s>
<s>
Also	O
,	O
with	O
the	O
Beyond	B-Application
the	I-Application
Sword	I-Application
expansion	O
,	O
new	O
units	O
are	O
added	O
such	O
as	O
executives	O
,	O
who	O
can	O
spread	O
corporations	O
to	O
new	O
cities	O
.	O
</s>
<s>
Technology	O
can	O
also	O
determine	O
another	O
win	O
condition	O
;	O
several	O
endgame	O
technology	O
nodes	O
are	O
required	O
to	O
develop	O
a	O
colony	O
ship	O
to	O
reach	O
Alpha	B-Application
Centauri	I-Application
.	O
</s>
<s>
Religion	O
plays	O
a	O
much	O
more	O
important	O
role	O
in	O
Civilization	B-Application
IV	I-Application
than	O
in	O
the	O
previous	O
installments	O
of	O
the	O
franchise	O
.	O
</s>
<s>
Civilization	B-Application
IV	I-Application
is	O
much	O
more	O
open	O
to	O
modification	O
than	O
its	O
predecessors	O
were	O
.	O
</s>
<s>
Game	O
data	O
and	O
rules	O
are	O
stored	O
in	O
XML	B-Protocol
files	O
,	O
and	O
a	O
Software	B-Application
Development	I-Application
Kit	I-Application
was	O
released	O
in	O
April	O
2006	O
to	O
allow	O
customization	O
of	O
game	B-Application
AI	I-Application
.	O
</s>
<s>
The	O
map	O
editor	O
supports	O
Python	B-Language
.	O
</s>
<s>
The	O
World	O
Builder	O
for	O
Civilization	B-Application
IV	I-Application
is	O
in-game	O
,	O
in	O
contrast	O
to	O
previous	O
Civilization	O
games	O
where	O
the	O
Map	O
Editor	O
was	O
an	O
external	O
application	O
.	O
</s>
<s>
More	O
game	O
attributes	O
are	O
stored	O
in	O
XML	B-Protocol
files	O
,	O
which	O
can	O
be	O
edited	O
with	O
an	O
external	O
text	O
editor	O
or	O
application	O
.	O
</s>
<s>
The	O
Civilization	B-Application
IV	I-Application
software	B-Application
development	I-Application
kit	I-Application
was	O
released	O
on	O
April	O
13	O
,	O
2006	O
,	O
to	O
coincide	O
with	O
the	O
release	O
of	O
the	O
v1.61	O
patch	O
.	O
</s>
<s>
The	O
kit	O
allows	O
players	O
to	O
view	O
,	O
modify	O
,	O
or	O
even	O
completely	O
re-write	O
the	O
game	O
's	O
DLL	O
source	O
code	O
,	O
enabling	O
the	O
modification	O
of	O
the	O
game	O
's	O
AI	B-Application
and	O
other	O
integral	O
parts	O
of	O
the	O
game	O
that	O
were	O
previously	O
not	O
accessible	O
.	O
</s>
<s>
The	O
game	O
engine	O
for	O
Civilization	B-Application
IV	I-Application
was	O
built	O
entirely	O
from	O
scratch	O
,	O
with	O
some	O
help	O
from	O
NDL	O
's	O
Gamebryo	O
engine	O
.	O
</s>
<s>
The	O
soundtrack	O
for	O
the	O
game	O
features	O
compositions	O
of	O
Medieval	O
,	O
Renaissance	O
,	O
and	O
Baroque	O
origin	O
,	O
and	O
design	O
for	O
the	O
title	O
music	O
was	O
influenced	O
by	O
The	B-Application
Lion	I-Application
King	I-Application
.	O
</s>
<s>
Sid	B-Application
Meier	I-Application
's	I-Application
Civilization	I-Application
IV	I-Application
also	O
released	O
some	O
bonus	O
content	O
,	O
mainly	O
to	O
show	O
modding	O
capabilities	O
:	O
</s>
<s>
The	O
Civilization	O
Anonymous	O
campaign	O
was	O
brought	O
back	O
for	O
the	O
following	O
game	O
Civilization	B-Application
V	I-Application
.	O
Break	O
described	O
the	O
campaign	O
as	O
"	O
hilarious	O
"	O
,	O
while	O
Kotaku	O
described	O
it	O
as	O
a	O
"	O
great	O
promotional	O
campaign	O
"	O
that	O
"	O
comes	O
across	O
as	O
terrifyingly	O
realistic	O
"	O
.	O
</s>
<s>
As	O
part	O
of	O
the	O
Civilization	B-Application
V	I-Application
version	O
of	O
the	O
campaign	O
,	O
2K	O
Games	O
asked	O
Civilization	O
addicts	O
to	O
submit	O
stories	O
via	O
video	O
in	O
order	O
to	O
win	O
$	O
2,500	O
and	O
a	O
"	O
framed	O
,	O
limited	O
edition	O
Civilization	O
Anonymous	O
poster	O
signed	O
by	O
Firaxis	O
Games	O
"	O
.	O
</s>
<s>
Civilization	B-Application
IV	I-Application
was	O
published	O
for	O
the	O
Windows	B-Application
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
platforms	O
.	O
</s>
<s>
Aspyr	O
released	O
the	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
version	O
on	O
June	O
26	O
,	O
2006	O
,	O
and	O
a	O
Mac	O
digital	O
version	O
was	O
released	O
January	O
2010	O
on	O
gameagent.com	O
.	O
</s>
<s>
Users	O
who	O
quickly	O
purchased	O
the	O
game	O
after	O
initial	O
release	O
reported	O
having	O
problems	O
playing	O
the	O
game	O
on	O
particular	O
sets	O
of	O
video	B-Application
drivers	I-Application
,	O
which	O
were	O
later	O
resolved	O
by	O
a	O
Firaxis	O
patch	O
,	O
according	O
to	O
GameSpy	O
.	O
</s>
<s>
Firaxis	O
Games	O
has	O
also	O
published	O
two	O
expansion	O
packs	O
for	O
Civilization	B-Application
IV	I-Application
,	O
entitled	O
Civilization	B-Application
IV	I-Application
:	I-Application
Warlords	I-Application
and	O
Civilization	B-Application
IV	I-Application
:	I-Application
Beyond	I-Application
the	I-Application
Sword	I-Application
.	O
</s>
<s>
A	O
remake	O
of	O
the	O
original	O
1994	O
Sid	B-Application
Meier	I-Application
's	I-Application
Colonization	I-Application
,	O
rebuilt	O
with	O
Civilization	O
IV'''s	O
game	O
engine	O
and	O
titled	O
Civilization	B-Application
IV	I-Application
:	I-Application
Colonization	I-Application
,	O
was	O
released	O
for	O
Mac	O
and	O
PC	O
as	O
a	O
standalone	O
game	O
and	O
later	O
bundled	O
with	O
the	O
two	O
expansions	O
as	O
Civilization	B-Application
IV	I-Application
:	O
The	O
Complete	O
Edition	O
.	O
</s>
<s>
NPD	O
declared	O
Civilization	B-Application
IV	I-Application
the	O
11th-best-selling	O
computer	O
game	O
of	O
2005	O
,	O
and	O
it	O
rose	O
to	O
ninth	O
place	O
on	O
the	O
firm	O
's	O
annual	O
computer	O
game	O
sales	O
chart	O
for	O
the	O
following	O
year	O
.	O
</s>
<s>
According	O
to	O
Take-Two	O
Interactive	O
,	O
sales	O
of	O
Civilization	B-Application
IV	I-Application
surpassed	O
3	O
million	O
units	O
by	O
March	O
2008	O
.	O
</s>
<s>
Critics	O
such	O
as	O
GameSpot	O
's	O
Andrew	O
Park	O
praised	O
not	O
only	O
the	O
improvements	O
in	O
the	O
turn-based	O
strategy	O
genre	O
that	O
carried	O
over	O
from	O
other	O
installments	O
in	O
the	O
series	O
,	O
but	O
also	O
noted	O
the	O
game	O
's	O
more	O
advanced	O
3D	O
computer	O
graphics	O
,	O
difficult	O
AI	B-Application
opponents	I-Application
,	O
and	O
multiplayer	O
feature	O
.	O
</s>
<s>
IGN	O
commented	O
that	O
the	O
game	B-Application
AI	I-Application
was	O
much	O
more	O
intelligent	O
than	O
it	O
was	O
in	O
Civilization	B-Application
III	I-Application
,	O
which	O
designer	O
Soren	O
Johnson	O
stated	O
was	O
thanks	O
to	O
their	O
"	O
secret	O
pre-beta	O
group	O
"	O
testing	O
the	O
game	O
before	O
release	O
.	O
</s>
<s>
Likewise	O
,	O
GameSpy	O
's	O
Dave	O
Kosak	O
pointed	O
out	O
other	O
flaws	O
of	O
the	O
multiplayer	O
interface	B-Application
,	O
stating	O
that	O
it	O
"	O
is	O
a	O
little	O
rough	O
in	O
places	O
.	O
</s>
<s>
In	O
August	O
2016	O
,	O
Civilization	B-Application
IV	I-Application
placed	O
11th	O
on	O
Time	O
's	O
The	O
50	O
Best	O
Video	O
Games	O
of	O
All	O
Time	O
list	O
.	O
</s>
<s>
Awards	O
Civilization	B-Application
IV	I-Application
won	O
multiple	O
awards	O
at	O
various	O
events	O
and	O
gaming	O
websites	O
.	O
</s>
<s>
and	O
Guild	B-Application
Wars	I-Application
,	O
as	O
the	O
Best	O
Strategy	B-Application
Game	I-Application
(	O
both	O
for	O
PC	O
and	O
overall	O
)	O
and	O
as	O
the	O
Best	O
Online	O
Game	O
of	O
2005	O
for	O
PC	O
.	O
</s>
<s>
GameSpot	O
awarded	O
the	O
game	O
Best	O
Strategy	B-Application
Game	I-Application
and	O
Best	O
PC	O
Game	O
,	O
and	O
it	O
was	O
nominated	O
as	O
an	O
entry	O
for	O
Game	O
of	O
the	O
Year	O
.	O
</s>
<s>
GameSpy	O
named	O
the	O
game	O
Game	O
of	O
the	O
Year	O
,	O
PC	O
Game	O
of	O
the	O
Year	O
,	O
and	O
Best	O
PC	O
Turn-Based	O
Strategy	B-Application
Game	I-Application
of	O
the	O
Year	O
.	O
</s>
<s>
At	O
the	O
ninth	O
annual	O
Interactive	O
Achievement	O
Awards	O
,	O
Civilization	B-Application
IV	I-Application
won	O
Strategy	B-Application
Game	I-Application
of	O
the	O
Year	O
and	O
was	O
nominated	O
as	O
an	O
entry	O
for	O
Overall	O
Game	O
of	O
the	O
Year	O
and	O
Computer	O
Game	O
of	O
the	O
Year	O
.	O
</s>
<s>
At	O
the	O
53rd	O
Annual	O
Grammy	O
Awards	O
of	O
2010	O
,	O
the	O
song	O
"	O
Baba	O
Yetu	O
"	O
,	O
which	O
was	O
written	O
to	O
be	O
the	O
title	O
theme	O
for	O
Civilization	B-Application
IV	I-Application
,	O
won	O
in	O
the	O
Best	O
Instrumental	O
Arrangement	O
Accompanying	O
Vocalist	O
category	O
,	O
because	O
it	O
had	O
been	O
allowed	O
eligibility	O
in	O
the	O
competition	O
through	O
Christopher	O
Tin	O
's	O
inclusion	O
of	O
the	O
song	O
in	O
his	O
subsequent	O
release	O
of	O
his	O
2009	O
album	O
Calling	O
All	O
Dawns	O
.	O
</s>
<s>
The	O
editors	O
of	O
Computer	O
Games	O
Magazine	O
named	O
Civilization	B-Application
IV	I-Application
the	O
best	O
computer	O
game	O
of	O
2005	O
,	O
and	O
presented	O
it	O
with	O
their	O
awards	O
for	O
"	O
Best	O
Strategy	B-Application
Game	I-Application
"	O
,	O
"	O
Best	O
AI	B-Application
"	O
and	O
"	O
Best	O
Interface	B-Application
"	O
.	O
</s>
<s>
Even	O
for	O
long-time	O
fans	O
of	O
the	O
series	O
,	O
playing	O
Civilization	B-Application
IV	I-Application
is	O
like	O
discovering	O
it	O
for	O
the	O
very	O
first	O
time.	O
"	O
</s>
<s>
Civilization	B-Application
IV	I-Application
also	O
won	O
PC	O
Gamer	O
USs	O
"	O
Best	O
Turn-Based	O
Strategy	B-Application
Game	I-Application
2005	O
"	O
award	O
.	O
</s>
