<s>
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
is	O
a	O
2012	O
turn-based	B-Application
tactical	I-Application
video	O
game	O
developed	O
by	O
Firaxis	O
Games	O
and	O
published	O
by	O
2K	O
.	O
</s>
<s>
The	O
game	O
is	O
a	O
"	O
reimagined	O
"	O
remake	O
of	O
the	O
1994	O
cult	O
classic	O
strategy	B-Application
game	I-Application
X-COM	B-Application
:	I-Application
UFO	I-Application
Defense	I-Application
(	O
also	O
known	O
as	O
UFO	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
)	O
and	O
a	O
reboot	O
of	O
MicroProse	O
's	O
1990s	O
X-COM	B-Application
series	O
.	O
</s>
<s>
The	O
player	O
commands	O
troops	O
in	O
the	O
field	O
in	O
a	O
series	O
of	O
turn-based	B-Application
tactical	I-Application
missions	O
;	O
between	O
missions	O
,	O
the	O
player	O
directs	O
the	O
research	O
and	O
development	O
of	O
technologies	O
from	O
recovered	O
alien	O
technology	O
and	O
captured	O
prisoners	O
,	O
expands	O
XCOM	O
's	O
base	O
of	O
operations	O
,	O
manages	O
finances	O
,	O
and	O
monitors	O
and	O
responds	O
to	O
alien	O
activity	O
.	O
</s>
<s>
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
was	O
released	O
for	O
Microsoft	B-Application
Windows	I-Application
,	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
and	O
Xbox	B-Operating_System
360	I-Operating_System
in	O
North	O
America	O
on	O
October	O
9	O
,	O
2012	O
,	O
and	O
in	O
Europe	O
and	O
Australia	O
on	O
October	O
12	O
,	O
2012	O
.	O
</s>
<s>
An	O
"	O
Elite	O
Edition	O
"	O
,	O
containing	O
all	O
previously	O
released	O
downloadable	B-Protocol
content	I-Protocol
,	O
was	O
released	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
by	O
Feral	O
Interactive	O
in	O
April	O
2013	O
.	O
</s>
<s>
A	O
port	O
for	O
iOS	B-Application
was	O
released	O
in	O
June	O
2013	O
and	O
an	O
Android	B-Application
conversion	O
was	O
released	O
in	O
April	O
2014	O
.	O
</s>
<s>
An	O
expansion	O
pack	O
,	O
titled	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Within	I-Application
,	O
was	O
released	O
in	O
November	O
2013	O
.	O
</s>
<s>
In	O
June	O
2014	O
,	O
Feral	O
released	O
both	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
and	O
its	O
expansion	O
pack	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Within	I-Application
for	O
Linux	B-Application
.	O
</s>
<s>
A	O
bundle	O
containing	O
both	O
Enemy	B-Application
Unknown	I-Application
and	O
Enemy	O
Within	O
was	O
launched	O
on	O
the	O
PlayStation	O
Store	O
for	O
PlayStation	B-Device
Vita	I-Device
in	O
March	O
2016	O
under	O
the	O
title	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
Plus	O
.	O
</s>
<s>
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
was	O
critically	O
acclaimed	O
,	O
with	O
several	O
reviewers	O
commenting	O
on	O
the	O
game	O
's	O
difficulty	O
,	O
replayability	O
,	O
and	O
addictiveness	O
.	O
</s>
<s>
A	O
sequel	O
to	O
the	O
game	O
,	O
titled	O
XCOM	B-Application
2	I-Application
,	O
was	O
released	O
on	O
February	O
5	O
,	O
2016	O
for	O
Microsoft	B-Application
Windows	I-Application
,	O
OS	B-Operating_System
X	I-Operating_System
,	O
and	O
Linux	B-Application
.	O
</s>
<s>
Much	O
like	O
its	O
predecessor	O
,	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
casts	O
the	O
player	O
as	O
the	O
commander	O
of	O
an	O
elite	O
military	O
organization	O
.	O
</s>
<s>
As	O
commander	O
,	O
the	O
player	O
directs	O
their	O
soldiers	O
in	O
turn-based	B-Application
combat	I-Application
missions	O
against	O
alien	O
enemies	O
.	O
</s>
<s>
The	O
turn-based	B-Application
ground	O
combat	O
uses	O
a	O
top-down	O
3D	O
perspective	O
.	O
</s>
<s>
The	O
game	O
's	O
strategy	B-Application
element	O
occurs	O
between	O
missions	O
.	O
</s>
<s>
A	O
holographic	O
view	O
of	O
the	O
Earth	O
called	O
the	O
"	O
Geoscape	O
"	O
allows	O
the	O
player	O
to	O
keep	O
track	O
of	O
the	O
situation	O
around	O
the	O
world	O
,	O
ordering	O
aircraft	O
to	O
intercept	O
UFOs	B-Application
and	O
dispatching	O
soldiers	O
to	O
engage	O
aliens	O
on	O
the	O
ground	O
.	O
</s>
<s>
Although	O
there	O
are	O
some	O
differences	O
in	O
the	O
interface	O
between	O
platforms	O
,	O
unlike	O
other	O
games	O
such	O
as	O
Firaxis	O
 '	O
Civilization	B-Application
Revolution	I-Application
,	O
the	O
content	O
is	O
not	O
simplified	O
for	O
the	O
console	O
versions	O
.	O
</s>
<s>
The	O
PC	O
version	O
features	O
a	O
mouse-driven	O
UI	B-Application
.	O
</s>
<s>
Capturing	O
one	O
of	O
the	O
alien	O
troops	O
and	O
conducting	O
the	O
interrogation	O
reveals	O
vague	O
information	O
about	O
another	O
type	O
of	O
alien	O
called	O
the	O
Outsiders	O
,	O
artificially-created	O
crystalline	O
beings	O
encountered	O
aboard	O
UFOs	B-Application
,	O
that	O
appear	O
to	O
serve	O
as	O
pilots	O
and	O
navigators	O
.	O
</s>
<s>
Tapping	O
into	O
the	O
aliens	O
 '	O
communications	O
reveals	O
a	O
previously	O
hidden	O
,	O
stealth	O
"	O
Overseer	O
"	O
UFO	B-Application
making	O
rounds	O
across	O
the	O
Earth	O
.	O
</s>
<s>
When	O
the	O
UFO	B-Application
is	O
shot	O
down	O
,	O
it	O
is	O
found	O
to	O
hold	O
an	O
alien	O
species	O
that	O
had	O
not	O
been	O
previously	O
encountered	O
,	O
as	O
well	O
as	O
a	O
strange	O
psionic	O
artifact	O
.	O
</s>
<s>
Out	O
of	O
these	O
psychic	O
human	O
soldiers	O
,	O
the	O
most	O
powerful	O
becomes	O
the	O
Volunteer	O
,	O
using	O
the	O
psionic	O
artifact	O
recovered	O
from	O
the	O
Overseer	O
UFO	B-Application
to	O
tap	O
into	O
the	O
aliens	O
 '	O
psychic	O
communication	O
"	O
hive	O
"	O
,	O
an	O
experience	O
that	O
also	O
increases	O
his	O
or	O
her	O
psionic	O
strength	O
.	O
</s>
<s>
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
went	O
into	O
development	O
in	O
early	O
2008	O
as	O
a	O
"	O
very	O
,	O
very	O
big	O
budget	O
"	O
project	O
with	O
about	O
50	O
–	O
60	O
team	O
members	O
led	O
by	O
Jake	O
Solomon	O
.	O
</s>
<s>
Its	O
prototype	O
was	O
a	O
straightforward	O
remake	O
of	O
the	O
original	O
1994	O
game	O
X-COM	B-Application
:	I-Application
UFO	I-Application
Defense	I-Application
with	O
all	O
the	O
classic	O
gameplay	O
features	O
.	O
</s>
<s>
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
was	O
developed	O
independently	O
of	O
2K	O
Marin	O
's	O
XCOM	O
(	O
later	O
rebranded	O
as	O
The	B-Application
Bureau	I-Application
:	I-Application
XCOM	I-Application
Declassified	I-Application
)	O
,	O
and	O
although	O
the	O
two	O
games	O
are	O
set	O
in	O
different	O
universes	O
,	O
the	O
developers	O
of	O
the	O
two	O
games	O
were	O
in	O
contact	O
with	O
one	O
another	O
.	O
</s>
<s>
Enemy	B-Application
Unknown	I-Application
was	O
the	O
first	O
title	O
developed	O
by	O
Firaxis	O
Games	O
not	O
to	O
feature	O
the	O
name	O
of	O
Sid	O
Meier	O
,	O
who	O
served	O
as	O
the	O
director	O
of	O
creative	O
development	O
but	O
was	O
not	O
directly	O
involved	O
in	O
the	O
game	O
's	O
development	O
day	O
to	O
day	O
.	O
</s>
<s>
All	O
members	O
of	O
the	O
development	O
team	O
played	O
and	O
finished	O
the	O
original	O
Enemy	B-Application
Unknown	I-Application
game	O
–	O
they	O
were	O
required	O
to	O
do	O
so	O
if	O
they	O
had	O
not	O
already	O
when	O
they	O
joined	O
the	O
team	O
.	O
</s>
<s>
Roland	O
Rizzo	O
,	O
who	O
has	O
been	O
working	O
with	O
the	O
X-COM	B-Application
series	O
since	O
the	O
beginning	O
,	O
became	O
the	O
audio	O
lead	O
for	O
the	O
game	O
and	O
was	O
tasked	O
with	O
reimagining	O
and	O
updating	O
John	O
Broomhall	O
's	O
famous	O
original	O
music	O
score	O
.	O
</s>
<s>
Michael	O
McCann	O
,	O
composer	O
for	O
Deus	B-Application
Ex	I-Application
:	I-Application
Human	I-Application
Revolution	I-Application
,	O
was	O
involved	O
in	O
creating	O
the	O
game	O
's	O
musical	O
score	O
.	O
</s>
<s>
The	O
Civilization	O
series	O
 '	O
art	O
director	O
Greg	O
Foertsch	O
was	O
given	O
the	O
task	O
of	O
reimagining	O
the	O
look	O
of	O
X-COM	B-Application
,	O
including	O
redesigning	O
the	O
classic	O
alien	O
species	O
.	O
</s>
<s>
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
was	O
revealed	O
on	O
January	O
5	O
,	O
2012	O
by	O
Game	O
Informer	O
.	O
</s>
<s>
Pre-order	O
bonuses	O
included	O
the	O
"	O
Classic	O
X-COM	B-Application
Soldier	O
"	O
(	O
a	O
haircut	O
for	O
the	O
player	O
's	O
male	O
soldier	O
based	O
on	O
the	O
model	O
for	O
troops	O
in	O
the	O
original	O
1994	O
X-COM	B-Application
)	O
and	O
the	O
option	O
to	O
customize	O
the	O
aesthetic	O
design	O
of	O
soldiers	O
 '	O
armor	O
.	O
</s>
<s>
Those	O
pre-ordering	O
the	O
PC	O
version	O
on	O
Steam	B-Application
also	O
received	O
bonus	O
items	O
for	O
Valve	O
's	O
Team	B-Application
Fortress	I-Application
2	I-Application
and	O
a	O
free	O
copy	O
of	O
Firaxis	O
 '	O
2010	O
strategy	B-Application
game	I-Application
Civilization	B-Application
V	I-Application
.	O
The	O
game	O
's	O
playable	O
demo	O
version	O
was	O
released	O
on	O
September	O
24	O
,	O
2012	O
for	O
Steam	B-Application
,	O
on	O
October	O
9	O
for	O
Xbox	B-Application
Live	I-Application
and	O
on	O
October	O
10	O
for	O
PlayStation	B-Device
Network	I-Device
.	O
</s>
<s>
Eight	O
custom	O
promotional	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
arcade	O
cabinets	O
were	O
produced	O
in	O
August	O
2011	O
by	O
2K	O
Games	O
and	O
Bespoke	O
Arcades	O
.	O
</s>
<s>
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
was	O
released	O
in	O
stores	O
on	O
October	O
9	O
,	O
2012	O
for	O
North	O
American	O
consumers	O
and	O
on	O
October	O
12	O
,	O
2012	O
for	O
Australian	O
and	O
European	O
consumers	O
.	O
</s>
<s>
The	O
game	O
was	O
released	O
for	O
digital	O
distribution	O
via	O
Steam	B-Application
on	O
October	O
9	O
,	O
2012	O
.	O
</s>
<s>
An	O
"	O
Elite	O
Edition	O
"	O
,	O
containing	O
all	O
previously	O
released	O
DLC	B-Protocol
,	O
was	O
announced	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
by	O
Feral	O
Interactive	O
on	O
February	O
26	O
,	O
2013	O
and	O
was	O
released	O
on	O
April	O
25	O
,	O
2013	O
.	O
</s>
<s>
An	O
iOS	B-Application
port	O
,	O
scheduled	O
to	O
be	O
released	O
in	O
the	O
summer	O
of	O
2013	O
,	O
was	O
announced	O
during	O
a	O
PAX	O
East	O
panel	O
on	O
March	O
23	O
,	O
2013	O
.	O
</s>
<s>
A	O
version	O
for	O
Android	B-Application
was	O
released	O
on	O
April	O
2014	O
.	O
</s>
<s>
An	O
expansion	O
pack	O
,	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Within	I-Application
was	O
released	O
worldwide	O
on	O
Steam	B-Application
and	O
in	O
retail	O
stores	O
on	O
November	O
15	O
,	O
2013	O
.	O
</s>
<s>
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
greatly	O
impressed	O
the	O
public	O
and	O
media	O
at	O
E3	O
2012	O
,	O
where	O
it	O
won	O
a	O
number	O
of	O
awards	O
from	O
a	O
variety	O
of	O
gaming	O
publications	O
,	O
such	O
as	O
the	O
title	O
of	O
"	O
Best	O
Strategy	B-Application
Game	I-Application
"	O
from	O
GameSpy	O
,	O
Game	O
Informer	O
,	O
IGN	O
,	O
and	O
Machinima	O
.	O
</s>
<s>
The	O
game	O
also	O
won	O
the	O
titles	O
"	O
Best	O
PC	O
Game	O
"	O
and	O
"	O
Best	O
Strategy	B-Application
Game	I-Application
"	O
in	O
the	O
2012	O
E3	O
Game	O
Critics	O
Awards	O
.	O
</s>
<s>
A	O
pre-release	O
version	O
of	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
received	O
highly	O
positive	O
previews	O
by	O
,	O
among	O
others	O
,	O
PlayStation	O
Official	O
Magazine	O
,	O
Official	O
Xbox	B-Operating_System
Magazine	O
and	O
Rock	O
,	O
Paper	O
,	O
Shotgun	O
.	O
</s>
<s>
It	O
was	O
described	O
as	O
"	O
a	O
hallmark	O
of	O
excellence	O
"	O
by	O
Destructoid	O
and	O
"	O
an	O
exemplary	O
turn-based	B-Application
strategy	B-Application
game	I-Application
"	O
by	O
Joystiq	O
.	O
</s>
<s>
Dan	O
Stapleton	O
of	O
GameSpy	O
wrote	O
:	O
"	O
I	O
consider	O
the	O
1994	O
turn-based	B-Application
tactical	I-Application
masterpiece	O
X-COM	B-Application
:	I-Application
UFO	I-Application
Defense	I-Application
to	O
be	O
the	O
single	O
best	O
videogame	O
ever	O
made	O
.	O
</s>
<s>
Compared	O
directly	O
to	O
that	O
impossibly	O
high	O
standard	O
,	O
Firaxis	O
 '	O
2012	O
remake	O
,	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
,	O
does	O
remarkably	O
well.	O
"	O
</s>
<s>
Josh	O
Harmon	O
of	O
Electronic	O
Gaming	O
Monthly	O
(	O
EGM	O
)	O
stated	O
that	O
"	O
to	O
say	O
that	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
is	O
a	O
phenomenal	O
remake	O
would	O
be	O
selling	O
Firaxis	O
 '	O
monumental	O
accomplishment	O
short	O
.	O
</s>
<s>
The	O
developer	O
has	O
n't	O
just	O
managed	O
to	O
capture	O
the	O
spirit	O
of	O
the	O
original	O
;	O
they	O
've	O
also	O
tweaked	O
,	O
trimmed	O
,	O
and	O
innovated	O
enough	O
to	O
deliver	O
the	O
freshest	O
,	O
most	O
engaging	O
strategy	B-Application
game	I-Application
in	O
recent	O
memory	O
,	O
if	O
not	O
ever.	O
"	O
</s>
<s>
Eurogamer	O
's	O
review	O
by	O
Rich	O
Stanton	O
described	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
as	O
"	O
a	O
winner	O
"	O
and	O
"	O
a	O
fantastic	O
game	O
"	O
that	O
"	O
brings	O
back	O
and	O
revitalises	O
a	O
classic.	O
"	O
</s>
<s>
Alex	O
Rubens	O
of	O
G4	O
called	O
it	O
"	O
an	O
exceptionally	O
solid	O
return	O
for	O
the	O
series	O
,	O
and	O
one	O
that	O
every	O
turn-based	B-Application
tactics	I-Application
fan	O
should	O
experience	O
,	O
"	O
adding	O
that	O
"	O
even	O
if	O
you	O
never	O
played	O
the	O
original	O
,	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
is	O
turn-based	B-Application
tactics	I-Application
and	O
management	O
at	O
its	O
finest	O
,	O
and	O
a	O
perfect	O
introduction	O
to	O
the	O
genre.	O
"	O
</s>
<s>
Polygon	O
's	O
Russ	O
Pitts	O
criticized	O
the	O
"	O
weird	O
dichotomy	O
"	O
of	O
the	O
game	O
's	O
strategy	B-Application
component	O
,	O
but	O
praised	O
the	O
tactical	O
gameplay	O
,	O
calling	O
it	O
"	O
one	O
of	O
the	O
best	O
and	O
most	O
artfully	O
designed	O
strategy	B-Application
games	I-Application
in	O
recent	O
memory.	O
"	O
</s>
<s>
Edwin	O
Evans-Thirlwell	O
of	O
Official	O
Xbox	B-Operating_System
Magazine	O
stated	O
that	O
it	O
"	O
is	O
n't	O
just	O
Xbox	B-Operating_System
360	I-Operating_System
's	O
finest	O
strategy	B-Application
experience	O
–	O
it	O
's	O
also	O
a	O
strategy	B-Application
game	I-Application
which	O
changes	O
how	O
you	O
think	O
about	O
strategy	B-Application
games.	O
"	O
</s>
<s>
G4	O
's	O
review	O
noted	O
that	O
"	O
the	O
extreme	O
difficulty	O
of	O
the	O
game	O
might	O
not	O
be	O
welcomed	O
by	O
all	O
players	O
"	O
and	O
Official	O
Xbox	B-Operating_System
Magazine	O
described	O
the	O
game	O
as	O
"	O
reliably	O
unforgiving	O
"	O
.	O
</s>
<s>
In	O
a	O
retrospective	O
article	O
about	O
the	O
original	O
from	O
1994	O
,	O
Alec	O
Meer	O
of	O
Eurogamer	O
compared	O
both	O
games	O
,	O
coming	O
to	O
conclusion	O
that	O
"	O
X-COM	B-Application
and	O
XCOM	O
are	O
completely	O
different	O
games	O
,	O
both	O
ingenious	O
and	O
both	O
flawed	O
in	O
their	O
own	O
ways.	O
"	O
</s>
<s>
According	O
to	O
Chris	O
Schilling	O
of	O
VideoGamer.com,	O
"	O
Enemy	B-Application
Unknown	I-Application
is	O
respectful	O
of	O
Julian	O
Gollop	O
's	O
1994	O
turn-based	B-Application
strategy	B-Application
classic	O
,	O
but	O
it	O
's	O
not	O
reverential.	O
"	O
</s>
<s>
Charlie	O
Hall	O
of	O
Ars	O
Technica	O
wrote	O
that	O
"	O
in	O
the	O
end	O
,	O
this	O
is	O
not	O
the	O
X-COM	B-Application
that	O
everyone	O
was	O
expecting	O
.	O
</s>
<s>
If	O
you	O
're	O
merely	O
looking	O
for	O
a	O
highly	O
competent	O
re-skin	O
of	O
the	O
original	O
X-COM	B-Application
,	O
keep	O
your	O
eyes	O
peeled	O
for	O
the	O
upcoming	O
Xenonauts.	O
"	O
</s>
<s>
Multiple	O
publications	O
including	O
Giant	O
Bomb	O
,	O
Kotaku	O
,	O
MTV	O
and	O
GameTrailers	O
gave	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
their	O
overall	O
Game	O
of	O
the	O
Year	O
award	O
for	O
2012	O
.	O
</s>
<s>
GameSpy	O
also	O
gave	O
XCOM	O
its	O
Game	O
of	O
the	O
Year	O
award	O
(	O
"	O
Achievements	O
:	O
Game	O
of	O
the	O
Year	O
,	O
High	O
Tension	O
,	O
Making	O
Turn-Based	B-Application
Cool	O
Again	O
"	O
)	O
,	O
commenting	O
that	O
"	O
few	O
games	O
can	O
deliver	O
the	O
thrill	O
of	O
victory	O
and	O
the	O
agony	O
of	O
defeat	O
in	O
the	O
way	O
that	O
XCOM	O
does.	O
"	O
</s>
<s>
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
was	O
chosen	O
by	O
the	O
2012	O
Spike	O
TV	O
Video	O
Game	O
Awards	O
as	O
a	O
nominee	O
in	O
the	O
category	O
Best	O
PC	O
Game	O
.	O
</s>
<s>
Awards	O
,	O
it	O
was	O
nominated	O
for	O
three	O
awards	O
,	O
including	O
"	O
Game	O
of	O
the	O
Year	O
"	O
,	O
and	O
ended	O
up	O
winning	O
two	O
for	O
2012	O
's	O
"	O
Strategy/Simulation	O
Game	O
of	O
the	O
Year	O
"	O
and	O
"	O
Outstanding	O
Achievement	O
in	O
Gameplay	O
Engineering	O
"	O
.	O
</s>
<s>
Awarding	O
the	O
game	O
its	O
title	O
of	O
Strategy	B-Application
Game	I-Application
of	O
the	O
Year	O
,	O
PC	O
Gamer	O
wrote	O
it	O
can	O
be	O
"	O
forging	O
player	O
memories	O
that	O
'll	O
live	O
as	O
long	O
as	O
you	O
play	O
and	O
care	O
about	O
games.	O
"	O
</s>
<s>
A	O
sequel	O
to	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
,	O
XCOM	B-Application
2	I-Application
,	O
was	O
released	O
on	O
February	O
5	O
,	O
2016	O
.	O
</s>
<s>
It	O
was	O
developed	O
by	O
Firaxis	O
Games	O
and	O
was	O
released	O
on	O
Microsoft	B-Application
Windows	I-Application
,	O
OS	B-Operating_System
X	I-Operating_System
and	O
Linux	B-Application
.	O
</s>
<s>
The	O
game	O
takes	O
place	O
20	O
years	O
after	O
the	O
events	O
of	O
Enemy	B-Application
Unknown	I-Application
,	O
in	O
an	O
alternate	O
scenario	O
where	O
XCOM	O
failed	O
to	O
stop	O
the	O
alien	O
invasion	O
and	O
humanity	O
surrenders	O
.	O
</s>
