<s>
Marathon	B-Application
is	O
a	O
first-person	O
shooter	O
video	O
game	O
developed	O
and	O
published	O
by	O
Bungie	O
,	O
and	O
released	O
in	O
December	O
1994	O
for	O
the	O
Apple	B-Device
Macintosh	I-Device
.	O
</s>
<s>
The	O
game	O
takes	O
place	O
several	O
centuries	O
into	O
the	O
future	O
in	O
outer	O
space	O
and	O
sets	O
the	O
player	O
as	O
a	O
security	O
officer	O
attempting	O
to	O
stop	O
an	O
alien	O
invasion	O
aboard	O
a	O
colony	O
ship	O
named	O
the	O
Marathon	B-Application
.	O
</s>
<s>
Marathon	B-Application
is	O
the	O
first	O
game	O
in	O
a	O
series	O
of	O
three	O
games	O
collectively	O
known	O
as	O
the	O
Marathon	B-Application
Trilogy	I-Application
,	O
which	O
also	O
includes	O
its	O
two	O
sequels	O
,	O
Marathon	B-Application
2	I-Application
:	I-Application
Durandal	I-Application
and	O
Marathon	B-Application
Infinity	I-Application
,	O
released	O
in	O
1995	O
and	O
1996	O
respectively	O
.	O
</s>
<s>
In	O
1996	O
,	O
Bungie	O
released	O
Super	B-Application
Marathon	I-Application
,	O
a	O
port	O
of	O
Marathon	B-Application
and	O
Marathon	B-Application
2	I-Application
to	O
the	O
short-lived	O
Apple	B-Device
Bandai	I-Device
Pippin	I-Device
video	O
game	O
console	O
.	O
</s>
<s>
Bungie	O
released	O
the	O
source	O
code	O
of	O
Marathon	B-Application
2	I-Application
in	O
1999	O
,	O
which	O
enabled	O
the	O
development	O
of	O
an	O
open-source	O
enhanced	O
version	O
of	O
the	O
Marathon	B-Application
2	I-Application
engine	O
called	O
Aleph	O
One	O
.	O
</s>
<s>
The	O
player	O
assumes	O
the	O
role	O
of	O
a	O
nameless	O
security	O
officer	O
aboard	O
a	O
large	O
colony	O
ship	O
called	O
the	O
Marathon	B-Application
,	O
constructed	O
from	O
Mars	B-Application
 '	O
moon	O
Deimos	O
.	O
</s>
<s>
Marathon	B-Application
also	O
features	O
free	B-General_Concept
look	I-General_Concept
,	O
allowing	O
the	O
player	O
to	O
use	O
the	O
mouse	O
to	O
fire	O
weapons	O
and	O
rotate	O
their	O
character	O
's	O
view	O
.	O
</s>
<s>
Marathon	B-Application
was	O
one	O
of	O
the	O
earliest	O
computer	O
games	O
to	O
employ	O
free	B-General_Concept
look	I-General_Concept
and	O
give	O
the	O
player	O
the	O
ability	O
to	O
look	O
up	O
or	O
down	O
.	O
</s>
<s>
The	O
game	O
interface	O
includes	O
an	O
overhead	O
map	O
,	O
a	O
motion	B-Device
sensor	I-Device
indicating	O
the	O
positions	O
and	O
movements	O
of	O
both	O
enemies	O
and	O
allied	O
characters	O
through	O
red	O
triangles	O
and	O
green	O
squares	O
respectively	O
,	O
and	O
bars	O
displaying	O
the	O
player	O
's	O
current	O
shield	O
and	O
oxygen	O
levels	O
.	O
</s>
<s>
Some	O
levels	O
have	O
low-gravity	O
,	O
oxygen-free	O
environments	O
and/or	O
magnetic	O
fields	O
that	O
interfere	O
with	O
the	O
player	O
's	O
motion	B-Device
sensor	I-Device
.	O
</s>
<s>
Unique	O
among	O
first-person	O
shooters	O
of	O
its	O
time	O
,	O
Marathon	B-Application
has	O
a	O
detailed	O
,	O
complex	O
plot	O
that	O
is	O
fundamental	O
to	O
gameplay	O
and	O
player	O
advancement	O
.	O
</s>
<s>
The	O
player	O
accesses	O
these	O
terminals	O
to	O
interface	O
with	O
the	O
artificial	O
intelligences	O
of	O
the	O
Marathon	B-Application
,	O
who	O
provide	O
information	O
regarding	O
the	O
player	O
's	O
current	O
objective	O
.	O
</s>
<s>
Marathon	B-Application
's	O
engine	O
,	O
like	O
the	O
Jedi	O
engine	O
featured	O
in	O
Star	B-Application
Wars	I-Application
:	I-Application
Dark	I-Application
Forces	I-Application
,	O
was	O
very	O
slightly	O
superior	O
to	O
the	O
Doom	B-Application
engine	O
,	O
but	O
not	O
nearly	O
as	O
advanced	O
as	O
the	O
Build	B-Application
engine	I-Application
.	O
</s>
<s>
Like	O
the	O
Build	B-Application
engine	I-Application
,	O
it	O
was	O
capable	O
of	O
a	O
limited	O
form	O
of	O
rooms	O
over	O
rooms	O
and	O
even	O
impossible	O
spaces	O
,	O
as	O
long	O
as	O
the	O
player	O
could	O
n't	O
see	O
both	O
rooms	O
at	O
the	O
same	O
time	O
.	O
</s>
<s>
However	O
,	O
it	O
lacked	O
mirrors	O
,	O
sloped	O
floors	O
and	O
ceilings	O
,	O
destructible	O
environments	O
,	O
and	O
many	O
of	O
the	O
other	O
advanced	O
features	O
offered	O
by	O
the	O
Build	B-Application
engine	I-Application
.	O
</s>
<s>
In	O
addition	O
to	O
its	O
main	O
single	O
player	O
scenario	O
,	O
Marathon	B-Application
also	O
features	O
a	O
multiplayer	O
deathmatch	O
mode	O
that	O
can	O
accommodate	O
eight	O
players	O
on	O
the	O
same	O
local	B-General_Concept
area	I-General_Concept
network	I-General_Concept
.	O
</s>
<s>
Marathon'''s	O
game	O
files	O
contain	O
ten	O
levels	O
for	O
the	O
multiplayer	O
mode	O
.	O
</s>
<s>
Marathons	B-Application
multiplayer	O
was	O
one	O
of	O
its	O
most	O
anticipated	O
features	O
prior	O
to	O
release	O
and	O
won	O
Marathon	B-Application
the	O
Macworld	O
Game	O
Hall	O
of	O
Fame	O
Award	O
for	O
the	O
best	O
network	O
game	O
of	O
1995	O
.	O
</s>
<s>
Lead	O
designer	O
Jason	O
Jones	O
stated	O
that	O
the	O
development	O
of	O
Marathon	B-Application
was	O
probably	O
delayed	O
by	O
a	O
month	O
due	O
to	O
time	O
spent	O
playing	O
multiplayer	O
deathmatches	O
.	O
</s>
<s>
The	O
code	O
for	O
multiplayer	O
was	O
written	O
almost	O
entirely	O
by	O
Alain	O
Roy	O
who	O
reportedly	O
received	O
a	O
Quadra	B-Device
660AV	I-Device
in	O
compensation	O
for	O
his	O
efforts	O
.	O
</s>
<s>
According	O
to	O
Jones	O
,	O
the	O
network	O
code	O
is	O
packet-based	O
and	O
uses	O
the	O
Datagram	B-Protocol
Delivery	I-Protocol
Protocol	I-Protocol
to	O
transfer	O
information	O
between	O
each	O
machine	O
.	O
</s>
<s>
Marathon	B-Application
primarily	O
takes	O
place	O
in	O
2794	O
aboard	O
the	O
UESC	O
Marathon	B-Application
,	O
a	O
large	O
Earth	O
colony	O
ship	O
constructed	O
from	O
the	O
Martian	B-Application
moon	O
Deimos	O
.	O
</s>
<s>
The	O
Marathon'''s	O
mission	O
is	O
to	O
travel	O
to	O
the	O
Tau	B-Application
Ceti	I-Application
system	O
and	O
build	O
a	O
colony	O
on	O
its	O
fourth	O
planet	O
.	O
</s>
<s>
The	O
player	O
's	O
character	O
is	O
an	O
unnamed	O
security	O
officer	O
assigned	O
to	O
the	O
Marathon	B-Application
.	O
</s>
<s>
These	O
messages	O
include	O
crew	O
logs	O
,	O
historical	O
documents	O
,	O
and	O
other	O
records	O
,	O
but	O
principally	O
include	O
conversations	O
that	O
the	O
player	O
character	O
has	O
with	O
three	O
artificial	O
intelligences	O
(	O
AIs	O
)	O
that	O
run	O
UESC	O
Marathon	B-Application
:	O
Leela	O
,	O
Durandal	O
,	O
and	O
Tycho	O
.	O
</s>
<s>
At	O
the	O
start	O
of	O
the	O
game	O
,	O
the	O
player	O
character	O
is	O
aboard	O
a	O
shuttle	O
returning	O
from	O
the	O
colony	O
to	O
Marathon	B-Application
when	O
an	O
alien	O
ship	O
attacks	O
the	O
system	O
.	O
</s>
<s>
The	O
officer	O
makes	O
his	O
way	O
to	O
Marathon	B-Application
to	O
find	O
that	O
the	O
aliens	O
used	O
an	O
electromagnetic	O
pulse	O
to	O
disable	O
much	O
of	O
the	O
ship	O
.	O
</s>
<s>
Leela	O
learns	O
that	O
Durandal	O
(	O
one	O
of	O
the	O
shipboard	O
AIs	O
)	O
had	O
been	O
in	O
contact	O
with	O
the	O
aliens	O
prior	O
to	O
their	O
engagement	O
with	O
Marathon	B-Application
.	O
</s>
<s>
The	O
alien	O
race	O
,	O
known	O
as	O
the	O
S'pht	B-Application
,	O
are	O
being	O
forced	O
to	O
fight	O
by	O
the	O
Pfhor	B-Application
,	O
an	O
insectoid-like	O
race	O
.	O
</s>
<s>
Leela	O
aids	O
the	O
officer	O
to	O
disable	O
Durandal	O
's	O
access	O
to	O
vital	O
Marathon	B-Application
systems	O
while	O
sending	O
a	O
warning	O
message	O
to	O
Earth	O
,	O
but	O
in	O
turn	O
Durandal	O
has	O
the	O
Pfhor	B-Application
send	O
more	O
forces	O
to	O
attack	O
the	O
Marathon	B-Application
,	O
ultimately	O
kidnapping	O
the	O
security	O
officer	O
.	O
</s>
<s>
Leela	O
intercedes	O
to	O
free	O
the	O
officer	O
,	O
but	O
warns	O
him	O
that	O
the	O
S'pht	B-Application
attack	O
has	O
nearly	O
destroyed	O
her	O
systems	O
.	O
</s>
<s>
The	O
officer	O
races	O
to	O
complete	O
a	O
bomb	O
in	O
the	O
ship	O
's	O
engineering	O
rooms	O
,	O
hoping	O
it	O
will	O
force	O
the	O
Pfhor	B-Application
and	O
S'pht	B-Application
to	O
leave	O
,	O
but	O
it	O
is	O
too	O
late	O
as	O
Leela	O
is	O
"	O
killed	O
"	O
by	O
the	O
S'pht	B-Application
,	O
and	O
Durandal	O
takes	O
over	O
,	O
forcing	O
the	O
officer	O
to	O
continue	O
to	O
follow	O
his	O
orders	O
to	O
stay	O
alive	O
.	O
</s>
<s>
Durandal	O
has	O
the	O
officer	O
repair	O
the	O
ship	O
's	O
transporters	O
,	O
allowing	O
him	O
to	O
go	O
aboard	O
the	O
alien	O
Pfhor	B-Application
vessel	O
.	O
</s>
<s>
Inside	O
,	O
while	O
fighting	O
off	O
the	O
Pfhor	B-Application
,	O
the	O
officer	O
discovers	O
a	O
large	O
cybernetic	O
organism	O
that	O
the	O
Pfhor	B-Application
use	O
to	O
control	O
the	O
S'pht	B-Application
.	O
</s>
<s>
The	O
officer	O
destroys	O
the	O
organism	O
,	O
and	O
guided	O
by	O
Durandal	O
,	O
the	O
S'pht	B-Application
revolt	O
against	O
the	O
Pfhor	B-Application
,	O
first	O
on	O
their	O
ship	O
,	O
and	O
then	O
aboard	O
the	O
Marathon	B-Application
.	O
</s>
<s>
With	O
most	O
of	O
the	O
Pfhor	B-Application
threat	O
gone	O
,	O
Durandal	O
announces	O
his	O
intention	O
to	O
transfer	O
himself	O
to	O
the	O
Pfhor	B-Application
ship	O
,	O
which	O
the	O
S'pht	B-Application
have	O
control	O
of	O
,	O
and	O
leave	O
with	O
them	O
.	O
</s>
<s>
As	O
a	O
parting	O
gift	O
,	O
Durandal	O
reveals	O
that	O
Leela	O
was	O
never	O
fully	O
destroyed	O
,	O
and	O
the	O
S'pht	B-Application
release	O
their	O
grasp	O
on	O
her	O
before	O
departing	O
.	O
</s>
<s>
As	O
the	O
alien	O
ship	O
departs	O
the	O
system	O
,	O
the	O
officer	O
works	O
with	O
Leela	O
to	O
clear	O
the	O
last	O
remaining	O
Pfhor	B-Application
aboard	O
Marathon	B-Application
before	O
assessing	O
the	O
full	O
damage	O
that	O
has	O
been	O
done	O
.	O
</s>
<s>
At	O
the	O
time	O
,	O
Alex	O
Seropian	O
of	O
Bungie	O
said	O
that	O
"	O
the	O
customer	O
demand	O
for	O
Marathon	B-Application
is	O
ten-fold	O
than	O
it	O
was	O
for	O
Pathways	O
,	O
"	O
leading	O
to	O
supply	O
shortages	O
.	O
</s>
<s>
The	O
game	O
reached	O
sales	O
above	O
100,000	O
units	O
before	O
the	O
release	O
of	O
Marathon	B-Application
2	I-Application
.	O
</s>
<s>
As	O
with	O
all	O
Bungie	O
titles	O
before	O
Halo	O
:	O
Combat	O
Evolved	O
,	O
its	O
lifetime	O
sales	O
fell	O
below	O
200,000	O
units	O
by	O
2002.Next	O
Generation	O
reviewed	O
the	O
Macintosh	B-Device
version	O
of	O
the	O
game	O
,	O
rating	O
it	O
four	O
stars	O
out	O
of	O
five	O
,	O
and	O
said	O
that	O
"	O
this	O
comes	O
highly	O
recommended	O
"	O
.	O
</s>
<s>
MacUser	O
named	O
Marathon	B-Application
the	O
best	O
action	O
game	O
of	O
1995	O
,	O
ahead	O
of	O
Doom	B-Application
II	I-Application
.	O
</s>
<s>
In	O
1996	O
,	O
Computer	O
Gaming	O
World	O
named	O
Marathon	B-Application
the	O
64th	O
best	O
game	O
ever	O
.	O
</s>
<s>
Gaming	O
historians	O
have	O
referred	O
to	O
Marathon	B-Application
as	O
the	O
Macintosh	B-Device
's	O
answer	O
to	O
the	O
PC	O
's	O
Doom	B-Application
,	O
i.e.	O
</s>
<s>
In	O
1996	O
,	O
Bungie	O
completed	O
a	O
port	O
of	O
Marathon	B-Application
to	O
Apple	O
's	O
short-lived	O
Pippin	B-Device
video	O
game	O
console	O
.	O
</s>
<s>
The	O
port	O
was	O
released	O
as	O
part	O
of	O
Super	B-Application
Marathon	I-Application
,	O
a	O
compilation	O
of	O
Marathon	B-Application
and	O
Marathon	B-Application
2	I-Application
:	I-Application
Durandal	I-Application
which	O
was	O
published	O
and	O
distributed	O
by	O
Bandai	O
rather	O
than	O
Bungie	O
themselves	O
.	O
</s>
<s>
Super	B-Application
Marathon	I-Application
bears	O
the	O
distinction	O
of	O
being	O
the	O
first	O
console	O
game	O
developed	O
by	O
Bungie	O
,	O
predating	O
Oni	B-Application
and	O
Halo	O
:	O
Combat	O
Evolved	O
.	O
</s>
<s>
In	O
1999	O
,	O
Bungie	O
released	O
the	O
source	O
code	O
of	O
Marathon	B-Application
2	I-Application
,	O
which	O
enabled	O
the	O
development	O
of	O
an	O
open-source	O
enhanced	O
version	O
of	O
the	O
Marathon	B-Application
2	I-Application
engine	O
called	O
Aleph	O
One	O
.	O
</s>
<s>
Though	O
initially	O
only	O
M1A1	O
(	O
a	O
"	O
total	O
conversion	O
"	O
to	O
M2s	O
engine	O
)	O
could	O
be	O
used	O
to	O
play	O
the	O
first	O
Marathon	B-Application
,	O
Aleph	O
One	O
eventually	O
gained	O
native	O
M1	O
asset	O
support	O
.	O
</s>
<s>
Aleph	O
One	O
allows	O
Marathon	B-Application
to	O
be	O
played	O
on	O
modern	O
versions	O
of	O
Windows	O
,	O
macOS	B-Application
,	O
Linux	O
,	O
and	O
other	O
platforms	O
.	O
</s>
<s>
The	O
concepts	O
of	O
an	O
AI	O
working	O
with	O
an	O
armed	O
player	O
character	O
continued	O
from	O
the	O
roots	O
laid	O
out	O
in	O
the	O
Marathon	B-Application
series	I-Application
.	O
</s>
<s>
An	O
Aleph	O
One-based	O
port	O
of	O
Marathon	B-Application
for	O
Apple	O
's	O
iPhone	B-Device
and	O
iPad	B-Device
was	O
released	O
for	O
free	O
(	O
with	O
in-game	O
purchases	O
)	O
on	O
the	O
iTunes	O
App	O
Store	O
in	O
July	O
2011	O
.	O
</s>
