<s>
X-COM	B-Application
:	I-Application
UFO	I-Application
Defense	I-Application
(	O
known	O
as	O
UFO	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
in	O
Europe	O
)	O
is	O
a	O
1994	O
science	O
fiction	O
strategy	B-Application
video	I-Application
game	I-Application
developed	O
by	O
Mythos	O
Games	O
.	O
</s>
<s>
It	O
was	O
published	O
by	O
MicroProse	O
for	O
DOS	B-Device
and	O
Amiga	B-Device
computers	I-Device
,	O
the	O
Amiga	B-Device
CD32	I-Device
console	O
,	O
and	O
the	O
PlayStation	B-Device
.	O
</s>
<s>
Originally	O
planned	O
by	O
Julian	O
Gollop	O
as	O
a	O
sequel	O
to	O
Mythos	O
Games	O
 '	O
1988	O
Laser	B-Application
Squad	I-Application
,	O
the	O
game	O
mixes	O
real-time	O
management	B-Application
simulation	I-Application
with	O
turn-based	B-Application
tactics	I-Application
.	O
</s>
<s>
The	O
player	O
takes	O
the	O
role	O
of	O
commander	O
of	O
X-COM	B-Application
–	O
an	O
international	O
paramilitary	O
organization	O
secretly	O
defending	O
Earth	O
from	O
an	O
alien	O
invasion	O
.	O
</s>
<s>
Through	O
the	O
game	O
,	O
the	O
player	O
is	O
tasked	O
with	O
issuing	O
orders	O
to	O
individual	O
X-COM	B-Application
troops	O
in	O
a	O
series	O
of	O
turn-based	B-Application
tactical	I-Application
missions	O
.	O
</s>
<s>
At	O
strategic	O
scale	O
,	O
the	O
player	O
directs	O
the	O
research	O
and	O
development	O
of	O
new	O
technologies	O
,	O
builds	O
and	O
expands	O
X-COM	B-Application
'	O
s	O
bases	O
,	O
manages	O
the	O
organization	O
's	O
finances	O
and	O
personnel	O
,	O
and	O
monitors	O
and	O
responds	O
to	O
UFO	B-Application
activity	O
.	O
</s>
<s>
The	O
game	O
received	O
strong	O
reviews	O
and	O
was	O
commercially	O
successful	O
,	O
acquiring	O
a	O
cult	O
following	O
among	O
strategy	B-Application
fans	O
;	O
several	O
publications	O
have	O
listed	O
X-COM	B-Application
:	I-Application
UFO	I-Application
Defense	I-Application
as	O
one	O
of	O
the	O
best	O
video	O
games	O
ever	O
made	O
,	O
including	O
IGN	O
ranking	O
it	O
as	O
the	O
best	O
PC	O
game	O
of	O
all	O
time	O
in	O
2007	O
.	O
</s>
<s>
It	O
was	O
the	O
first	O
and	O
best-received	O
entry	O
in	O
the	O
X-COM	B-Application
series	O
and	O
has	O
directly	O
inspired	O
several	O
similar	O
games	O
,	O
including	O
UFO	B-Application
:	I-Application
Alien	I-Application
Invasion	I-Application
,	O
UFO	B-Application
:	I-Application
Extraterrestrials	I-Application
and	O
Xenonauts	B-Application
.	O
</s>
<s>
An	O
official	O
remake	O
of	O
the	O
game	O
,	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
,	O
was	O
created	O
by	O
Firaxis	O
Games	O
and	O
published	O
by	O
2K	O
Games	O
in	O
2012	O
.	O
</s>
<s>
Mythos	O
Games	O
 '	O
and	O
Julian	O
Gollop	O
's	O
own	O
original	O
spiritual	O
successor	O
project	O
,	O
The	B-Application
Dreamland	I-Application
Chronicles	I-Application
:	I-Application
Freedom	I-Application
Ridge	I-Application
,	O
was	O
cancelled	O
in	O
2001	O
and	O
later	O
partially	O
turned	O
into	O
UFO	B-Application
:	I-Application
Aftermath	I-Application
by	O
another	O
developer	O
.	O
</s>
<s>
Gollop	O
's	O
new	O
X-COM	B-Application
spiritual	O
successor	O
project	O
,	O
Phoenix	B-Application
Point	I-Application
,	O
was	O
released	O
in	O
2019	O
.	O
</s>
<s>
The	O
story	O
of	O
X-COM	B-Application
,	O
set	O
in	O
the	O
near-future	O
at	O
the	O
time	O
of	O
the	O
game	O
's	O
release	O
,	O
begins	O
in	O
the	O
year	O
1998	O
.	O
</s>
<s>
The	O
initial	O
plot	O
centers	O
on	O
increased	O
reports	O
of	O
UFO	B-Application
sightings	O
as	O
tales	O
of	O
abductions	O
and	O
rumors	O
of	O
attacks	O
by	O
mysterious	O
aliens	O
become	O
widespread	O
.	O
</s>
<s>
From	O
this	O
meeting	O
is	O
born	O
the	O
clandestine	O
defense	O
and	O
research	O
organization	O
Extraterrestrial	O
Combat	O
(	O
X-COM	B-Application
)	O
,	O
over	O
which	O
the	O
player	O
assumes	O
control	O
at	O
the	O
start	O
of	O
the	O
game	O
.	O
</s>
<s>
It	O
is	O
ultimately	O
revealed	O
that	O
the	O
"	O
leaders	O
"	O
behind	O
the	O
alien	O
invasion	O
are	O
a	O
race	O
known	O
as	O
Ethereals	O
which	O
possess	O
powerful	O
mind	O
control	O
abilities	O
and	O
enslave	O
other	O
races	O
of	O
aliens	O
to	O
perform	O
their	O
bidding	O
and	O
that	O
their	O
main	O
base	O
in	O
the	O
Solar	O
System	O
is	O
located	O
in	O
Cydonia	O
region	O
of	O
Mars	B-Application
.	O
</s>
<s>
If	O
the	O
player	O
's	O
performance	O
is	O
poor	O
or	O
worse	O
for	O
two	O
consecutive	O
months	O
,	O
the	O
player	O
runs	O
a	O
deep	O
deficit	O
for	O
two	O
consecutive	O
months	O
,	O
all	O
the	O
player	O
's	O
bases	O
are	O
captured	O
,	O
or	O
the	O
player	O
mounts	O
an	O
assault	O
on	O
the	O
aliens	O
 '	O
Mars	B-Application
base	O
and	O
loses	O
,	O
the	O
game	O
ends	O
in	O
defeat	O
,	O
where	O
in	O
the	O
PlayStation	B-Device
version	O
,	O
the	O
council	O
of	O
funding	O
nations	O
makes	O
a	O
futile	O
attempt	O
to	O
negotiate	O
with	O
the	O
aliens	O
,	O
who	O
violently	O
murder	O
the	O
negotiator	O
.	O
</s>
<s>
While	O
in	O
the	O
MS-DOS	O
version	O
,	O
the	O
funding	O
nations	O
sign	O
pacts	O
with	O
the	O
aliens	O
promising	O
peace	O
,	O
but	O
they	O
instead	O
destroy	O
every	O
city	O
and	O
poison	O
the	O
water	O
and	O
air	O
to	O
destroy	O
any	O
resistance	O
,	O
the	O
remaining	O
survivors	O
are	O
put	O
in	O
slave	O
camps	O
to	O
help	O
terraform	O
Earth	O
for	O
future	O
alien	O
colonization	O
.	O
</s>
<s>
In	O
effect	O
,	O
X-COM	B-Application
melds	O
an	O
SSI	O
Gold	O
Box	O
RPG	O
with	O
a	O
highly	O
detailed	O
4X	B-Application
game	I-Application
like	O
Master	B-Application
of	I-Application
Orion	I-Application
,	O
making	O
it	O
in	O
some	O
ways	O
two	O
entirely	O
different	O
games.	O
"	O
</s>
<s>
The	O
game	O
begins	O
on	O
January	O
1	O
,	O
1999	O
,	O
with	O
the	O
player	O
choosing	O
a	O
location	O
for	O
their	O
first	O
base	O
on	O
the	O
Geoscape	O
screen	O
:	O
a	O
global	O
view	O
representation	O
of	O
Earth	O
as	O
seen	O
from	O
space	O
(	O
displaying	O
X-COM	B-Application
bases	O
and	O
aircraft	O
,	O
detected	O
UFOs	B-Application
,	O
alien	O
bases	O
,	O
and	O
sites	O
of	O
alien	O
activity	O
)	O
.	O
</s>
<s>
The	O
player	O
can	O
view	O
the	O
X-COM	B-Application
bases	O
and	O
make	O
changes	O
to	O
them	O
,	O
equip	O
fighter	O
aircraft	O
,	O
order	O
supplies	O
and	O
personnel	O
(	O
soldiers	O
,	O
scientists	O
and	O
engineers	O
)	O
,	O
direct	O
research	O
efforts	O
,	O
schedule	O
manufacturing	O
of	O
advanced	O
equipment	O
,	O
sell	O
alien	O
artifacts	O
on	O
black	O
market	O
to	O
raise	O
money	O
,	O
and	O
deploy	O
X-COM	B-Application
aircraft	O
to	O
either	O
patrol	O
designated	O
locations	O
,	O
intercept	O
UFOs	B-Application
,	O
or	O
send	O
X-COM	B-Application
ground	O
troops	O
on	O
missions	O
using	O
transport	O
aircraft	O
.	O
</s>
<s>
Funding	O
is	O
provided	O
by	O
the	O
16	O
founding	O
nations	O
of	O
X-COM	B-Application
.	O
</s>
<s>
At	O
the	O
end	O
of	O
each	O
month	O
,	O
a	O
funding	O
report	O
is	O
provided	O
,	O
where	O
nations	O
can	O
choose	O
to	O
increase	O
or	O
decrease	O
their	O
level	O
of	O
funding	O
based	O
on	O
their	O
perceived	O
progress	O
of	O
the	O
X-COM	B-Application
project	O
.	O
</s>
<s>
Through	O
reverse	O
engineering	O
of	O
recovered	O
alien	O
artifacts	O
,	O
X-COM	B-Application
is	O
able	O
to	O
develop	O
better	O
technology	O
to	O
combat	O
the	O
alien	O
menace	O
and	O
eventually	O
uncover	O
how	O
to	O
defeat	O
it	O
.	O
</s>
<s>
Gameplay	O
switches	O
to	O
the	O
tactical	O
combat	O
phase	O
whenever	O
X-COM	B-Application
ground	O
forces	O
come	O
in	O
contact	O
with	O
aliens	O
.	O
</s>
<s>
The	O
mission	O
's	O
score	O
and	O
the	O
result	O
are	O
based	O
on	O
the	O
number	O
of	O
X-COM	B-Application
operatives	O
lost	O
(	O
either	O
dead	O
,	O
unconscious	O
,	O
or	O
under	O
alien	O
control	O
)	O
,	O
civilians	O
saved	O
or	O
perished	O
,	O
aliens	O
killed	O
or	O
captured	O
,	O
and	O
the	O
number	O
and	O
quality	O
of	O
alien	O
artifacts	O
obtained	O
.	O
</s>
<s>
This	O
glitch	O
was	O
not	O
noticed	O
by	O
MicroProse	O
and	O
was	O
not	O
fixed	O
in	O
the	O
official	O
patches	O
,	O
resulting	O
in	O
the	O
very	O
high	O
difficulty	O
of	O
the	B-Application
sequel	I-Application
due	O
to	O
many	O
complaints	O
from	O
veteran	O
players	O
who	O
believed	O
that	O
the	O
original	O
game	O
was	O
still	O
too	O
easy	O
even	O
on	O
seemingly	O
higher	O
levels	O
.	O
</s>
<s>
OpenXcom	O
is	O
an	O
open-source	B-Application
reimplementation	O
of	O
that	O
game	O
to	O
fix	O
all	O
the	O
known	O
bugs	O
and	O
limits	O
,	O
improve	O
the	O
AI	B-Application
and	O
user	O
interface	O
,	O
localize	O
in	O
more	O
languages	O
,	O
and	O
to	O
provide	O
cross-platform	B-Operating_System
builds	O
,	O
e.g.	O
</s>
<s>
for	O
Linux	B-Application
and	O
Android	B-Application
.	O
</s>
<s>
The	O
game	O
was	O
originally	O
conceived	O
by	O
a	O
small	O
British	O
video	O
game	O
developer	O
company	O
,	O
Mythos	O
Games	O
–	O
led	O
by	O
Julian	O
Gollop	O
–	O
as	O
a	O
sequel	O
to	O
their	O
1988	O
science	O
fiction	O
tactical	O
game	O
Laser	B-Application
Squad	I-Application
,	O
"	O
but	O
with	O
much	O
neater	O
graphics	O
using	O
an	O
isometric	O
style	O
very	O
similar	O
to	O
Populous.	O
"	O
</s>
<s>
The	O
initial	O
1991	O
demo	O
presented	O
a	O
relatively	O
simple	O
,	O
two-player	O
tactical	O
game	O
then	O
known	O
as	O
Laser	B-Application
Squad	I-Application
2	O
(	O
or	O
Laser	B-Application
Squad	I-Application
II	O
)	O
,	O
which	O
ran	O
on	O
the	O
Atari	B-Device
ST	I-Device
.	O
</s>
<s>
Although	O
supportive	O
of	O
the	O
project	O
,	O
the	O
publisher	O
expressed	O
concerns	O
that	O
the	O
demo	O
lacked	O
a	O
grand	O
scale	O
in	O
keeping	O
with	O
MicroProse	O
's	O
hit	O
strategy	B-Application
game	I-Application
Civilization	B-Application
.	O
</s>
<s>
The	O
Civilopedia	O
feature	O
of	O
Civilization	B-Application
also	O
inspired	O
an	O
addition	O
of	O
the	O
in-game	O
encyclopedia	O
,	O
called	O
the	O
UFOpaedia	O
.	O
</s>
<s>
All	O
that	O
and	O
the	O
UFO	B-Application
theme	O
was	O
suggested	O
by	O
MicroProse	O
UK	O
head	O
of	O
development	O
Pete	O
Moreland	O
.	O
</s>
<s>
Under	O
MicroProse	O
's	O
direction	O
and	O
working	O
at	O
its	O
Chipping	O
Sodbury	O
studio	O
,	O
Julian	O
Gollop	O
said	O
that	O
while	O
the	O
research	O
and	O
technology	O
tree	O
somewhat	O
emulates	O
the	O
role	O
of	O
advances	O
in	O
Civilization	B-Application
,	O
"	O
it	O
also	O
helped	O
to	O
develop	O
the	O
storyline.	O
"	O
</s>
<s>
He	O
changed	O
the	O
setting	O
to	O
modern-day	O
Earth	O
and	O
expanded	O
the	O
strategy	B-Application
elements	O
,	O
among	O
them	O
the	O
ability	O
to	O
capture	O
and	O
reproduce	O
alien	O
technology	O
.	O
</s>
<s>
He	O
has	O
cited	O
the	O
1970s	O
British	O
television	O
series	O
UFO	B-Application
as	O
one	O
of	O
the	O
influences	O
for	O
the	O
game	O
's	O
storyline	O
,	O
in	O
particular	O
,	O
an	O
idea	O
of	O
an	O
international	O
counter-UFO	O
organization	O
and	O
the	O
psionic	O
powers	O
of	O
some	O
alien	O
races	O
,	O
even	O
as	O
the	O
series	O
itself	O
was	O
"	O
a	O
bit	O
boring	O
"	O
.	O
</s>
<s>
A	O
book	O
by	O
Bob	O
Lazar	O
,	O
where	O
he	O
describes	O
his	O
supposed	O
work	O
with	O
recovered	O
UFOs	B-Application
at	O
Area	B-Application
51	I-Application
,	O
inspired	O
the	O
concept	O
to	O
reverse-engineer	O
captured	O
alien	O
technology	O
.	O
</s>
<s>
There	O
were	O
also	O
major	O
contributors	O
who	O
were	O
not	O
acknowledged	O
in	O
the	O
game	O
's	O
credits	O
,	O
such	O
as	O
the	O
designer	O
Steve	O
Hand	O
,	O
a	O
Laser	B-Application
Squad	I-Application
fan	O
who	O
helped	O
the	O
project	O
get	O
signed	O
,	O
put	O
input	O
into	O
the	O
"	O
big	O
game	O
"	O
concept	O
,	O
actually	O
came	O
up	O
with	O
the	O
name	O
X-COM	B-Application
(	O
derived	O
from	O
Mike	O
Brunton	O
's	O
initial	O
idea	O
of	O
X-CON	O
,	O
where	O
"	O
CON	O
"	O
originally	O
stood	O
for	O
"	O
contact	O
"	O
)	O
,	O
and	O
helped	O
to	O
define	O
the	O
comic	O
book-like	O
art	O
style	O
.	O
</s>
<s>
Hand	O
thought	O
the	O
original	O
design	O
document	O
was	O
poorly	O
written	O
,	O
especially	O
regarding	O
the	O
initial	O
,	O
more	O
interactive	O
and	O
action-oriented	O
UFO	B-Application
interception	O
system	O
;	O
nevertheless	O
,	O
the	O
final	O
game	O
turned	O
out	O
to	O
be	O
very	O
close	O
to	O
it	O
.	O
</s>
<s>
A	O
public	O
demo	O
of	O
the	O
game	O
was	O
released	O
under	O
the	O
North	O
American	O
version	O
's	O
working	O
title	O
X-COM	B-Application
:	O
Terran	O
Defense	O
Force	O
.	O
</s>
<s>
Despite	O
numerous	O
changes	O
from	O
the	O
first	O
demo	O
,	O
the	O
tactical	O
part	O
of	O
the	O
game	O
remains	O
true	O
to	O
the	O
turn-based	O
layout	O
of	O
Laser	B-Application
Squad	I-Application
and	O
the	O
Gollop	O
brothers	O
 '	O
earlier	O
Rebelstar	B-Application
series	O
.	O
</s>
<s>
The	O
AI	B-Application
system	O
of	O
those	O
games	O
formed	O
the	O
basis	O
for	O
enemy	O
tactics	O
,	O
with	O
Julian	O
Gollop	O
programming	O
his	O
own	O
unique	O
algorithms	O
for	O
pathfinding	B-Algorithm
and	O
behavior	O
;	O
in	O
particular	O
,	O
the	O
aliens	O
were	O
purposely	O
given	O
an	O
element	O
of	O
unpredictability	O
in	O
their	O
actions	O
.	O
</s>
<s>
The	O
finished	O
product	O
was	O
marketed	O
as	O
UFO	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
in	O
Europe	O
,	O
Quebec	O
and	O
Australia	O
and	O
as	O
X-COM	B-Application
:	I-Application
UFO	I-Application
Defense	I-Application
in	O
North	O
America	O
.	O
</s>
<s>
The	O
latter	O
features	O
a	O
different	O
box	O
cover	O
,	O
faithful	O
to	O
the	O
game	O
's	O
contents	O
(	O
the	O
original	O
cover	O
of	O
UFO	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
depicts	O
the	O
aliens	O
and	O
their	O
spacecraft	O
design	O
that	O
are	O
unlike	O
anything	O
actually	O
seen	O
in	O
the	O
game	O
)	O
and	O
its	O
cartoonish	O
art	O
style	O
.	O
</s>
<s>
The	O
Amiga	B-Device
conversion	O
was	O
done	O
by	O
Julian	O
Gollop	O
's	O
brother	O
Nick	O
and	O
"	O
it	O
was	O
quite	O
tough	O
because	O
the	O
Amiga	B-Device
was	O
n’t	O
quite	O
as	O
fast	O
as	O
PCs	O
were	O
becoming	O
at	O
that	O
time.	O
"	O
</s>
<s>
The	O
Amiga	B-Device
ECS/OCS	O
version	O
displays	O
lower	O
quality	O
graphics	O
than	O
the	O
PC	O
version	O
and	O
is	O
missing	O
light	O
source	O
shading	O
during	O
combat	O
missions	O
,	O
but	O
the	O
sound	O
quality	O
is	O
improved	O
;	O
the	O
graphics	O
are	O
better	O
in	O
the	O
AGA	B-Device
Amiga	B-Device
version	O
.	O
</s>
<s>
A	O
Limited	O
Edition	O
for	O
the	O
Amiga	B-Device
CD32	I-Device
came	O
with	O
a	O
MicroProse	O
travel	O
alarm	O
clock	O
.	O
</s>
<s>
The	O
1995	O
PlayStation	B-Device
port	O
has	O
retained	O
the	O
original	O
graphics	O
due	O
to	O
time	O
restraints	O
(	O
adding	O
only	O
some	O
3D	O
models	O
as	O
illustrations	O
for	O
the	O
UFOpaedia	O
)	O
but	O
features	O
much	O
higher	O
quality	O
music	O
than	O
the	O
PC	O
version	O
(	O
55	O
minutes	O
of	O
CD-quality	O
tracks	O
and	O
8	O
minutes	O
of	O
16-bit	B-Device
tracks	O
instead	O
of	O
the	O
8-bit	O
MIDI	O
music	O
)	O
.	O
</s>
<s>
The	O
new	O
music	O
was	O
composed	O
by	O
Allister	O
Brimble	O
,	O
who	O
later	O
also	O
created	O
the	O
music	O
for	O
the	O
first	O
sequel	O
,	O
X-COM	B-Application
:	I-Application
Terror	I-Application
from	I-Application
the	I-Application
Deep	I-Application
.	O
</s>
<s>
It	O
is	O
compatible	O
with	O
the	O
highly	O
recommended	O
PlayStation	B-Device
Mouse	I-Device
and	O
requires	O
five	O
PlayStation	B-Device
memory	B-Device
card	I-Device
blocks	O
for	O
a	O
Battlescape	O
saved	O
game	O
.	O
</s>
<s>
The	O
game	O
was	O
re-released	O
as	O
part	O
of	O
the	O
compilations	O
X-COM	B-Application
:	O
Unknown	O
Terror	O
by	O
MicroProse	O
and	O
Prima	O
Games	O
in	O
1996	O
,	O
X-COM	B-Application
(	O
Collector	O
's	O
Edition	O
)	O
by	O
MicroProse	O
in	O
1998	O
,	O
X-COM	B-Application
Collection	O
by	O
Hasbro	O
Interactive	O
in	O
1999	O
,	O
X-COM	B-Application
:	O
Complete	O
Pack	O
by	O
2K	O
Games	O
in	O
2008	O
and	O
2K	O
Huge	O
Games	O
Pack	O
in	O
2009	O
,	O
as	O
well	O
as	O
in	O
the	O
"	O
Classic	O
Games	O
Collection	O
"	O
CD	O
featured	O
with	O
the	O
July	O
2000	O
issue	O
of	O
PC	O
Gamer	O
.	O
</s>
<s>
In	O
X-COM	B-Application
:	O
Complete	O
Pack	O
(	O
also	O
known	O
as	O
X-COM	B-Application
Collection	O
)	O
,	O
all	O
five	O
X-COM	B-Application
games	O
were	O
released	O
for	O
paid	O
download	O
on	O
Steam	B-Application
with	O
added	O
Windows	B-Application
XP	I-Application
and	O
Windows	B-Application
Vista	I-Application
support	O
.	O
</s>
<s>
Diane	O
Duane	O
's	O
1995	O
X-COM	B-Application
:	I-Application
UFO	I-Application
Defense	I-Application
–	O
A	O
Novel	O
(	O
)	O
tells	O
the	O
story	O
of	O
Jonelle	O
Barrett	O
,	O
commander	O
of	O
X-COM	B-Application
'	O
s	O
newly	O
established	O
Swiss	O
base	O
.	O
</s>
<s>
Another	O
novelization	O
of	O
the	O
game	O
,	O
Враг	O
неизвестен	O
(	O
"	O
Enemy	B-Application
Unknown	I-Application
"	O
)	O
written	O
by	O
Vladimir	O
Vasilyev	O
,	O
was	O
published	O
in	O
Russia	O
in	O
1997	O
.	O
</s>
<s>
The	O
book	O
tells	O
the	O
story	O
of	O
one	O
of	O
the	O
original	O
eight	O
X-COM	B-Application
troops	O
from	O
beginning	O
of	O
the	O
conflict	O
to	O
the	O
final	O
raid	O
on	O
Cydonia	O
.	O
</s>
<s>
The	O
game	O
was	O
released	O
to	O
very	O
positive	O
reviews	O
and	O
commercial	O
success	O
,	O
selling	O
more	O
than	O
600,000	O
units	O
on	O
the	O
PC	O
DOS	B-Device
platform	O
,	O
not	O
counting	O
the	O
later	O
ports	O
—	O
for	O
the	O
Amiga	B-Device
platforms	I-Device
and	O
the	O
PlayStation	B-Device
—	O
and	O
re-releases	O
.	O
</s>
<s>
Gollop	O
has	O
attributed	O
the	O
game	O
's	O
North	O
American	O
success	O
to	O
its	O
title	O
(	O
X-COM	B-Application
)	O
,	O
as	O
the	O
television	O
series	O
The	O
X-Files	O
had	O
premiered	O
a	O
year	O
earlier	O
.	O
</s>
<s>
Together	O
with	O
its	O
sequel	O
,	O
X-COM	B-Application
:	I-Application
Terror	I-Application
from	I-Application
the	I-Application
Deep	I-Application
,	O
its	O
sales	O
had	O
passed	O
1	O
million	O
copies	O
by	O
March	O
1997	O
.	O
</s>
<s>
Computer	O
Gaming	O
World	O
rated	O
X-COM	B-Application
five	O
stars	O
out	O
of	O
five	O
.	O
</s>
<s>
A	O
preview	O
of	O
the	O
PlayStation	B-Device
version	O
in	O
Next	O
Generation	O
called	O
it	O
"	O
one	O
of	O
the	O
best	O
PC	O
strategy	B-Application
games	I-Application
ever	O
"	O
.	O
</s>
<s>
GameSpot	O
said	O
,	O
"	O
put	O
simply	O
,	O
X-COM	B-Application
is	O
a	O
bona	O
fide	O
modern	O
classic	O
,	O
standing	O
proudly	O
alongside	O
Civilization	B-Application
and	O
Populous	B-Application
as	O
a	O
benchmark	O
in	O
the	O
evolution	O
of	O
strategy	B-Application
gaming	O
"	O
.	O
</s>
<s>
Electronic	O
Gaming	O
Monthly	O
stated	O
of	O
the	O
PlayStation	B-Device
version	O
that	O
"	O
any	O
person	O
who	O
likes	O
strategy	B-Application
games	I-Application
will	O
fall	O
in	O
love	O
with	O
this	O
title	O
...	O
if	O
you	O
could	O
afford	O
to	O
buy	O
one	O
game	O
for	O
the	O
PS	O
over	O
the	O
next	O
year	O
,	O
X-COM	B-Application
would	O
be	O
it	O
.	O
</s>
<s>
A	O
reviewer	O
for	O
Next	O
Generation	O
criticized	O
the	O
PlayStation	B-Device
version	O
for	O
being	O
little	O
more	O
than	O
a	O
straight	O
port	O
,	O
arguing	O
that	O
the	O
game	O
could	O
have	O
been	O
improved	O
if	O
the	O
console	O
's	O
capabilities	O
were	O
used	O
.	O
</s>
<s>
However	O
,	O
he	O
praised	O
the	O
game	O
itself	O
for	O
sophisticated	O
,	O
enjoyable	O
gameplay	O
,	O
and	O
concluded	O
,	O
"	O
X-COM	B-Application
was	O
a	O
smashing	O
PC	O
title	O
,	O
it	O
's	O
lost	O
nothing	O
of	O
practical	O
value	O
in	O
the	O
translation	O
,	O
and	O
makes	O
a	O
marvelous	O
addition	O
to	O
the	O
console	O
market	O
"	O
.	O
</s>
<s>
GamePro	O
disagreed	O
:	O
"	O
You	O
have	O
to	O
be	O
a	O
major	O
sim-freak	O
to	O
enjoy	O
X-COM	B-Application
.	O
</s>
<s>
Amiga	B-Device
ports	O
received	O
lower	O
ratings	O
than	O
the	O
PC	O
original	O
(	O
which	O
holds	O
an	O
average	O
score	O
of	O
93.60	O
%	O
at	O
GameRankings	O
)	O
,	O
according	O
to	O
Amiga	B-Device
HOL	O
database	O
having	O
averaged	O
scores	O
of	O
79%	O
on	O
the	O
ECS/OCS	O
Amigas	B-Device
,	O
82%	O
on	O
the	O
AGA	B-Device
Amigas	B-Device
and	O
73%	O
for	O
the	O
Amiga	B-Device
CD32	I-Device
version	O
.	O
</s>
<s>
A	O
common	O
point	O
of	O
criticism	O
for	O
the	O
floppy	B-Device
disk	I-Device
version	O
was	O
the	O
need	O
to	O
frequently	O
swap	O
the	O
disks	O
in	O
the	O
Amiga	B-Device
systems	O
not	O
equipped	O
with	O
a	O
hard	B-Device
disk	I-Device
drive	I-Device
,	O
while	O
the	O
CD-ROM	B-Device
based	O
CD32	B-Device
version	O
does	O
not	O
allow	O
the	O
users	O
to	O
save	O
the	O
progress	O
of	O
any	O
other	O
game	O
without	O
wiping	O
out	O
the	O
save	O
game	O
of	O
UFO	B-Application
.	O
</s>
<s>
Nevertheless	O
,	O
a	O
review	O
in	O
Amiga	B-Device
Action	O
called	O
it	O
"	O
easily	O
the	O
most	O
original	O
and	O
innovative	O
game	O
in	O
the	O
history	O
of	O
the	O
Amiga	B-Device
"	O
,	O
a	O
review	O
in	O
Amiga	B-Device
World	O
called	O
in	O
"	O
the	O
shortest	O
path	O
to	O
heaven	O
"	O
for	O
a	O
strategy	B-Application
gamer	O
,	O
and	O
a	O
review	O
in	O
CU	O
Amiga	B-Device
of	O
the	O
1997	O
budget	O
range	O
re-release	O
called	O
it	O
the	O
"	O
game	O
everyone	O
loves	O
"	O
.	O
</s>
<s>
Computer	O
Gaming	O
World	O
gave	O
X-COM	B-Application
its	O
Game	O
of	O
the	O
Year	O
award	O
.	O
</s>
<s>
PC	O
Gamer	O
US	O
presented	O
UFO	B-Application
Defense	I-Application
with	O
its	O
1994	O
"	O
Best	O
Strategy	B-Application
Game	I-Application
"	O
award	O
.	O
</s>
<s>
The	O
editors	O
wrote	O
,	O
"	O
X-COMs	B-Application
classic	O
mix	O
of	O
action	O
and	O
strategy	B-Application
will	O
have	O
you	O
hooked	O
for	O
hours	O
,	O
and	O
made	O
this	O
one	O
of	O
the	O
finest	O
games	O
of	O
the	O
year.	O
"	O
</s>
<s>
In	O
2009	O
,	O
Edge	O
called	O
X-COM	B-Application
"	O
the	O
title	O
that	O
first	O
brought	O
turn-based	O
wargaming	O
to	O
the	O
masses.	O
"	O
</s>
<s>
It	O
was	O
ranked	O
as	O
the	O
26th	O
top	O
game	O
of	O
all	O
time	O
by	O
Next	O
Generation	O
in	O
1996	O
(	O
"	O
breathed	O
new	O
live	O
into	O
turn-based	O
strategy	B-Application
genre	O
"	O
)	O
,	O
the	O
35th	O
best	O
video	O
game	O
of	O
all	O
time	O
by	O
GameSpy	O
in	O
2001	O
(	O
"	O
stellar	O
game	O
design	O
can	O
withstand	O
the	O
test	O
of	O
time	O
"	O
)	O
,	O
as	O
the	O
second	O
best	O
video	O
game	O
since	O
1992	O
by	O
Finnish	O
magazine	O
Pelit	O
in	O
2007	O
,	O
and	O
as	O
the	O
78th	O
best	O
video	O
game	O
"	O
to	O
play	O
today	O
"	O
by	O
Edge	O
in	O
2009	O
.	O
</s>
<s>
Polish	O
web	O
portal	O
Wirtualna	O
Polska	O
ranked	O
it	O
as	O
the	O
13th	O
best	O
Amiga	B-Device
game	O
,	O
as	O
well	O
as	O
the	O
third	O
most	O
addictive	O
game	O
"	O
that	O
stole	O
our	O
childhood	O
"	O
;	O
it	O
was	O
also	O
retrospectively	O
ranked	O
as	O
the	O
eighth	O
best	O
Amiga	B-Device
game	O
by	O
the	O
Polish	O
edition	O
of	O
CHIP	O
.	O
</s>
<s>
In	O
1999	O
,	O
Next	O
Generation	O
listed	O
X-Com	B-Application
UFO	I-Application
Defense	I-Application
as	O
number	O
37	O
on	O
their	O
"	O
Top	O
50	O
Games	O
of	O
All	O
Time	O
"	O
,	O
commenting	O
that	O
,	O
"	O
X-COM	B-Application
revamp	O
the	O
turn-based	O
subgenre	O
by	O
strengthening	O
the	O
resource	O
management	O
elements	O
and	O
adding	O
highly	O
intuitive	O
interface.	O
"	O
</s>
<s>
In	O
2015	O
,	O
Rock	O
,	O
Paper	O
,	O
Shotgun	O
listed	O
it	O
as	O
their	O
6th	O
"	O
Best	O
Strategy	B-Application
Games	I-Application
Ever	O
Made	O
"	O
(	O
"	O
in	O
the	O
thick	O
of	O
a	O
terror	O
mission	O
,	O
with	O
chrysalids	O
seeming	O
to	O
pour	O
out	O
of	O
the	O
walls	O
,	O
or	O
in	O
those	O
last	O
hours	O
when	O
you	O
finally	O
seem	O
capable	O
of	O
taking	O
the	O
fight	O
to	O
the	O
aliens	O
,	O
there	O
’s	O
nothing	O
else	O
quite	O
like	O
X-COM	B-Application
"	O
)	O
In	O
1996	O
,	O
GamesMaster	O
ranked	O
the	O
game	O
48th	O
on	O
their	O
"	O
Top	O
100	O
Games	O
of	O
All	O
Time.	O
"	O
</s>
<s>
IGN	O
named	O
it	O
as	O
the	O
number	O
one	O
top	O
PC	O
game	O
of	O
all	O
time	O
in	O
2000	O
(	O
"	O
the	O
finest	O
PC	O
game	O
we	O
have	O
ever	O
played	O
"	O
)	O
and	O
2007	O
(	O
"	O
there	O
's	O
still	O
no	O
PC	O
game	O
that	O
can	O
compete	O
with	O
the	O
mighty	O
X-COM	B-Application
"	O
)	O
,	O
as	O
well	O
as	O
ranking	O
it	O
as	O
the	O
second	O
top	O
"	O
modern	O
PC	O
game	O
"	O
in	O
2009	O
.	O
</s>
<s>
IGN	O
also	O
included	O
it	O
on	O
several	O
lists	O
of	O
the	O
best	O
video	O
games	O
of	O
all	O
time	O
on	O
all	O
platforms	O
,	O
including	O
it	O
at	O
eighth	O
place	O
in	O
2003	O
(	O
"	O
a	O
game	O
that	O
will	O
live	O
on	O
in	O
the	O
annals	O
of	O
computer	O
gaming	O
history	O
"	O
)	O
,	O
at	O
12th	O
place	O
in	O
2005	O
(	O
"	O
for	O
us	O
1994	O
will	O
always	O
be	O
remembered	O
as	O
the	O
year	O
of	O
X-COM	B-Application
"	O
)	O
,	O
and	O
at	O
21st	O
place	O
in	O
2007	O
(	O
"	O
one	O
of	O
the	O
most	O
memorable	O
and	O
perfectly	O
executed	O
strategy	B-Application
games	I-Application
ever	O
seen	O
"	O
)	O
.	O
</s>
<s>
It	O
was	O
also	O
inducted	O
into	O
several	O
halls	O
of	O
fame	O
,	O
including	O
by	O
CGW	O
in	O
2005	O
(	O
"	O
a	O
great	O
game	O
which	O
proves	O
that	O
pushing	O
the	O
technological	O
envelope	O
is	O
often	O
less	O
important	O
than	O
stoking	O
the	O
gamer	O
's	O
competitive	O
fire	O
"	O
)	O
,	O
by	O
GameSpot	O
in	O
2003	O
(	O
featured	O
among	O
The	O
Greatest	O
Games	O
of	O
All	O
Time	O
as	O
"	O
one	O
of	O
the	O
defining	O
games	O
of	O
the	O
turn-based	O
strategy	B-Application
genre	O
"	O
)	O
,	O
and	O
by	O
IGN	O
in	O
2007	O
(	O
"	O
if	O
this	O
game	O
were	O
a	O
woman	O
,	O
we	O
'd	O
marry	O
it	O
"	O
)	O
.	O
</s>
<s>
In	O
1999	O
,	O
the	O
game	O
's	O
Xenomorph-inspired	O
alien	O
race	O
of	O
Chryssalids	O
was	O
ranked	O
as	O
fourth	O
on	O
the	O
list	O
of	O
best	O
monsters	O
in	O
gaming	O
by	O
GameSpot	O
,	O
where	O
X-COM	B-Application
was	O
also	O
called	O
"	O
one	O
of	O
the	O
scariest	O
computer	O
games	O
ever	O
"	O
.	O
</s>
<s>
In	O
2012	O
,	O
while	O
awaiting	O
the	O
remake	O
,	O
The	O
Escapist	O
ran	O
a	O
feature	O
article	O
about	O
"	O
why	O
X-COM	B-Application
is	O
the	O
greatest	O
game	O
ever	O
"	O
and	O
game	O
designer	O
Ken	O
Levine	O
named	O
it	O
as	O
one	O
of	O
his	O
all-time	O
personal	O
favorites	O
.	O
</s>
<s>
Julian	O
Gollop	O
himself	O
designed	O
the	O
third	O
game	O
in	O
the	O
X-COM	B-Application
series	O
,	O
1997	O
's	O
X-COM	B-Application
:	I-Application
Apocalypse	I-Application
,	O
which	O
was	O
also	O
developed	O
together	O
by	O
Mythos	O
Games	O
and	O
MicroProse	O
.	O
</s>
<s>
The	O
game	O
also	O
received	O
an	O
unofficial	O
sequel	O
in	O
the	O
1997	O
expansion	O
set	O
Civ	B-Application
II	I-Application
:	O
Fantastic	B-Application
Worlds	I-Application
for	O
MicroProse	O
's	O
Civilization	B-Application
II	I-Application
,	O
in	O
a	O
scenario	O
set	O
on	O
the	O
Phobos	O
moon	O
of	O
Mars	B-Application
.	O
</s>
<s>
An	O
official	O
remake	O
,	O
titled	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
,	O
was	O
developed	O
by	O
Firaxis	O
Games	O
,	O
led	O
by	O
MicroProse	O
's	O
co-founder	O
Sid	O
Meier	O
.	O
</s>
<s>
The	O
game	O
was	O
released	O
by	O
2K	O
Games	O
for	O
Microsoft	B-Application
Windows	I-Application
,	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
in	O
October	O
2012	O
,	O
winning	O
multiple	O
Game	O
of	O
the	O
Year	O
awards	O
.	O
</s>
<s>
In	O
a	O
retrospective	O
article	O
in	O
Eurogamer	O
,	O
Alec	O
Meer	O
compared	O
both	O
games	O
with	O
"	O
a	O
sort	O
of	O
objectivity	O
from	O
me	O
that	O
has	O
n't	O
been	O
remotely	O
possible	O
over	O
the	O
last	O
two	O
decades	O
of	O
worshipping	O
at	O
its	O
VGA	B-Protocol
shrine	O
,	O
"	O
stating	O
:	O
"	O
I	O
can	O
see	O
a	O
game	O
that	O
can	O
and	O
will	O
co-exist	O
with	O
rather	O
than	O
be	O
supplanted	O
by	O
its	O
remake	O
.	O
</s>
<s>
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>
Also	O
,	O
there	O
is	O
a	O
promising	O
and	O
more	O
faithful	O
remake	O
called	O
Xenonauts.	O
"	O
</s>
<s>
The	O
game	O
also	O
had	O
a	O
big	O
influence	O
on	O
the	O
development	O
team	O
of	O
the	O
role-playing	O
video	O
game	O
Fallout	B-Application
.	O
</s>
<s>
Project	O
director	O
Tim	O
Cain	O
said	O
they	O
"	O
all	O
loved	O
X-COM	B-Application
"	O
and	O
that	O
the	O
original	O
version	O
of	O
Fallout	B-Application
(	O
known	O
as	O
Vault	B-Application
13	I-Application
,	O
before	O
the	O
game	O
was	O
redesigned	O
after	O
they	O
lost	O
the	O
GURPS	O
license	O
)	O
had	O
a	O
very	O
similar	O
combat	O
system	O
.	O
</s>
