<s>
The	O
Marathon	B-Application
Trilogy	I-Application
is	O
a	O
science	O
fiction	O
first-person	O
shooter	O
video	O
game	O
series	O
from	O
Bungie	O
,	O
primarily	O
released	O
for	O
the	B-Application
Mac	I-Application
OS	I-Application
.	O
</s>
<s>
The	O
three	O
games	O
in	O
the	O
series	O
—	O
Marathon	B-Application
(	O
1994	O
)	O
,	O
Marathon	B-Application
2	I-Application
:	I-Application
Durandal	I-Application
(	O
1995	O
)	O
,	O
and	O
Marathon	B-Application
Infinity	I-Application
(	O
1996	O
)	O
—	O
are	O
widely	O
regarded	O
as	O
spiritual	O
predecessors	O
of	O
Bungie	O
's	O
Halo	O
series	O
.	O
</s>
<s>
Players	O
of	O
the	O
Marathon	B-Application
games	O
navigate	O
futuristic	O
environments	O
in	O
a	O
first-person	O
perspective	O
.	O
</s>
<s>
Notably	O
for	O
the	O
time	O
,	O
the	O
Marathon	B-Application
engine	O
's	O
use	O
of	O
portal-based	O
rendering	O
rather	O
than	O
BSP-based	O
rendering	O
allowed	O
for	O
room-over-room	O
architecture	O
,	O
with	O
the	O
unusual	O
side	O
effect	O
of	O
allowing	O
spaces	O
which	O
would	O
overlap	O
in	O
real	O
life	O
;	O
this	O
arrangement	O
was	O
referred	O
to	O
as	O
"	O
5D	O
space	O
"	O
by	O
the	O
developers	O
.	O
</s>
<s>
In	O
Marathon	B-Application
2	I-Application
and	O
Marathon	B-Application
Infinity	I-Application
,	O
the	O
player	O
can	O
swim	O
in	O
different	O
types	O
of	O
liquids	O
such	O
as	O
water	O
and	O
lava	O
;	O
this	O
slowly	O
depletes	O
their	O
oxygen	O
and	O
,	O
for	O
some	O
types	O
of	O
liquid	O
,	O
their	O
shields	O
as	O
well	O
.	O
</s>
<s>
Another	O
notable	O
feature	O
in	O
all	O
three	O
games	O
is	O
teleporters	B-General_Concept
which	O
are	O
able	O
to	O
send	O
players	O
to	O
different	O
parts	O
of	O
a	O
level	O
or	O
to	O
other	O
levels	O
altogether	O
.	O
</s>
<s>
They	O
can	O
also	O
be	O
used	O
by	O
the	O
AI	B-Application
characters	O
in	O
the	O
game	O
to	O
transmit	O
ammunition	O
to	O
the	O
player	O
.	O
</s>
<s>
Many	O
levels	O
have	O
a	O
complex	O
floor	O
plan	O
,	O
made	O
more	O
complicated	O
by	O
the	O
use	O
of	O
teleporters	B-General_Concept
which	O
connect	O
different	O
locations	O
in	O
the	O
same	O
level	O
.	O
</s>
<s>
The	O
games	O
 '	O
story	O
is	O
presented	O
to	O
the	O
player	O
through	O
computer	B-General_Concept
terminals	I-General_Concept
throughout	O
the	O
single-player	O
levels	O
;	O
their	O
textual	O
content	O
is	O
often	O
accompanied	O
by	O
annotated	O
maps	O
or	O
other	O
still	O
images	O
.	O
</s>
<s>
The	O
contents	O
of	O
these	O
terminals	O
most	O
often	O
consist	O
of	O
messages	O
sent	O
by	O
artificial	B-Application
intelligences	I-Application
;	O
these	O
messages	O
advance	O
the	O
games	O
 '	O
narrative	O
and	O
provide	O
the	O
player	O
with	O
mission	O
objectives	O
.	O
</s>
<s>
Other	O
terminals	O
contain	O
civilian/alien	O
reports	O
or	O
diaries	O
,	O
database	O
articles	O
,	O
conversations	O
between	O
artificial	B-Application
intelligences	I-Application
and	O
even	O
stories	O
or	O
poems	O
.	O
</s>
<s>
After	O
all	O
mission	O
objectives	O
are	O
completed	O
,	O
the	O
player	O
usually	O
has	O
to	O
find	O
a	O
terminal	B-General_Concept
which	O
teleports	O
them	O
to	O
the	O
next	O
level	O
.	O
</s>
<s>
The	O
Marathon	B-Application
games	O
have	O
five	O
difficulty	O
settings	O
:	O
Kindergarten	O
,	O
Easy	O
,	O
Normal	O
,	O
Major	O
Damage	O
,	O
and	O
Total	O
Carnage	O
.	O
</s>
<s>
The	O
Marathon	B-Application
Trilogy	I-Application
received	O
wide	O
praise	O
for	O
its	O
multiplayer	O
mode	O
.	O
</s>
<s>
Maps	O
can	O
be	O
played	O
with	O
or	O
without	O
the	O
presence	O
of	O
alien	O
enemies	O
controlled	O
by	O
the	O
AI	B-Application
.	O
</s>
<s>
The	O
original	O
Marathon	B-Application
games	O
can	O
be	O
played	O
over	O
AppleTalk	B-Application
networks	O
(	O
LocalTalk	O
,	O
TokenTalk	B-Application
or	O
EtherTalk	B-Application
LAN	B-General_Concept
,	O
or	O
AppleTalk	B-Application
Remote	I-Application
Access	I-Application
)	O
.	O
</s>
<s>
Using	O
the	O
modern	O
Aleph	O
One	O
engine	O
,	O
games	O
can	O
be	O
played	O
over	O
TCP/IP	B-Protocol
networks	I-Protocol
(	O
LAN	B-General_Concept
or	O
Internet	O
)	O
,	O
with	O
client-side	O
prediction	O
routines	O
added	O
to	O
compensate	O
for	O
Internet	O
latency	O
and	O
a	O
new	O
metaserver	O
interface	O
for	O
finding	O
Internet	O
games	O
.	O
</s>
<s>
This	O
is	O
the	O
only	O
game	O
type	O
present	O
in	O
the	O
original	O
Marathon	B-Application
;	O
Bungie	O
planned	O
on	O
adding	O
the	O
ones	O
included	O
in	O
sequels	O
,	O
but	O
could	O
not	O
due	O
to	O
time	O
constraints	O
.	O
</s>
<s>
The	O
Marathon	B-Application
series	I-Application
was	O
the	O
first	O
in	O
its	O
genre	O
to	O
place	O
a	O
heavy	O
emphasis	O
on	O
storytelling	O
,	O
which	O
it	O
accomplished	O
through	O
the	O
use	O
of	O
terminals	O
.	O
</s>
<s>
This	O
narrative	O
approach	O
could	O
convey	O
much	O
more	O
detail	O
than	O
the	O
typically	O
terse	O
voice	O
acting	O
in	O
Marathon	B-Application
contemporaries	O
.	O
</s>
<s>
Set	O
in	O
2794	O
,	O
the	O
first	O
Marathon	B-Application
game	O
places	O
the	O
player	O
as	O
a	O
security	O
officer	O
aboard	O
an	O
enormous	O
human	O
starship	O
called	O
the	O
U.E.S.C.	O
</s>
<s>
Marathon	B-Application
,	O
orbiting	O
a	O
colony	O
on	O
the	O
planet	O
Tau	B-Application
Ceti	I-Application
IV	O
.	O
</s>
<s>
The	O
player	O
must	O
defend	O
the	O
ship	O
and	O
its	O
inhabitants	O
from	O
a	O
race	O
of	O
alien	O
slavers	O
called	O
the	O
Pfhor	B-Application
.	O
</s>
<s>
As	O
he	O
fights	O
against	O
the	O
invaders	O
,	O
he	O
witnesses	O
interactions	O
among	O
the	O
three	O
shipboard	O
AIs	B-Application
(	O
Leela	O
,	O
Durandal	O
and	O
Tycho	O
)	O
,	O
and	O
discovers	O
that	O
they	O
are	O
working	O
against	O
each	O
other	O
.	O
</s>
<s>
Durandal	O
has	O
gone	O
rampant	O
and	O
appears	O
to	O
be	O
playing	O
the	O
humans	O
against	O
the	O
Pfhor	B-Application
to	O
further	O
his	O
own	O
mysterious	O
agenda	O
,	O
ultimately	O
leading	O
the	O
S'pht	B-Application
,	O
one	O
of	O
the	O
races	O
enslaved	O
by	O
the	O
Pfhor	B-Application
,	O
in	O
a	O
rebellion	O
.	O
</s>
<s>
In	O
Marathon	B-Application
2	I-Application
:	I-Application
Durandal	I-Application
,	O
taking	O
place	O
seventeen	O
years	O
after	O
the	O
events	O
of	O
the	O
first	O
game	O
,	O
the	O
AI	B-Application
named	O
Durandal	O
sends	O
the	O
player	O
and	O
an	O
army	O
of	O
ex-colonists	O
to	O
search	O
the	O
ruins	O
of	O
Lh'owon	B-Application
,	O
the	O
S'pht	B-Application
homeworld	O
.	O
</s>
<s>
Lh'owon	B-Application
was	O
once	O
described	O
as	O
a	O
paradise	O
but	O
is	O
now	O
a	O
desert	O
world	O
due	O
to	O
the	O
S'pht	B-Application
Clan	O
Wars	O
and	O
the	O
invasion	O
by	O
the	O
Pfhor	B-Application
.	O
</s>
<s>
The	O
Pfhor	B-Application
are	O
planning	O
to	O
attack	O
Earth	O
,	O
and	O
Durandal	O
believes	O
that	O
something	O
found	O
on	O
Lh'owon	B-Application
may	O
stall	O
their	O
advance	O
.	O
</s>
<s>
Marathon	B-Application
2	I-Application
added	O
elements	O
to	O
the	O
series	O
such	O
as	O
a	O
Lh'owon-native	O
species	O
known	O
as	O
F'lickta	O
,	O
the	O
mention	O
of	O
an	O
ancient	O
and	O
mysterious	O
race	O
of	O
advanced	O
aliens	O
called	O
the	O
Jjaro	B-Application
,	O
and	O
a	O
clan	O
of	O
S'pht	B-Application
that	O
avoided	O
enslavement	O
by	O
the	O
Pfhor	B-Application
:	O
the	O
S'pht'Kr	O
.	O
</s>
<s>
At	O
the	O
climax	O
of	O
the	O
game	O
,	O
the	O
player	O
activates	O
Thoth	O
,	O
an	O
ancient	O
Jjaro	B-Application
AI	B-Application
.	O
</s>
<s>
Thoth	O
then	O
contacts	O
the	O
S'pht'Kr	O
,	O
who	O
in	O
turn	O
destroy	O
the	O
Pfhor	B-Application
armada	O
;	O
in	O
revenge	O
,	O
the	O
Pfhor	B-Application
deploy	O
a	O
weapon	O
which	O
causes	O
the	O
planet	O
's	O
sun	O
to	O
"	O
go	O
nova.	O
"	O
</s>
<s>
Marathon	B-Application
Infinity	I-Application
,	O
the	O
final	O
game	O
in	O
the	O
series	O
,	O
contains	O
more	O
levels	O
than	O
Marathon	B-Application
2	I-Application
,	O
and	O
they	O
are	O
larger	O
and	O
part	O
of	O
a	O
more	O
intricate	O
plot	O
.	O
</s>
<s>
Significant	O
additions	O
to	O
the	O
game	O
's	O
world	O
include	O
the	O
Jjaro	B-Application
ship	O
,	O
non-linear	O
level	O
progression	O
,	O
a	O
high-speed	O
machine	O
gun	O
which	O
could	O
be	O
used	O
underwater	O
,	O
and	O
vacuum-suited	O
human	O
allies	O
carrying	O
fusion	O
weapons	O
.	O
</s>
<s>
owon	O
's	O
sun	O
is	O
being	O
used	O
as	O
a	O
prison	O
for	O
an	O
eldritch	O
abomination	O
,	O
the	O
W'rkncacnter	B-Application
,	O
which	O
was	O
set	O
free	O
when	O
the	O
sun	O
went	O
nova	O
and	O
started	O
to	O
distort	O
space-time	O
.	O
</s>
<s>
The	O
player	O
traverses	O
multiple	O
timelines	O
,	O
attempting	O
to	O
find	O
one	O
in	O
which	O
the	O
W'rkncacnter	B-Application
is	O
not	O
freed	O
.	O
</s>
<s>
At	O
the	O
end	O
of	O
the	O
game	O
,	O
an	O
ancient	O
Jjaro	B-Application
machine	O
is	O
activated	O
to	O
keep	O
the	O
W'rkncacnter	B-Application
locked	O
in	O
the	O
Lh'owon	B-Application
sun	O
.	O
</s>
<s>
Elements	O
of	O
the	O
plot	O
and	O
setting	O
of	O
Marathon	B-Application
are	O
similar	O
to	O
The	O
Jesus	O
Incident	O
(	O
1979	O
)	O
by	O
Frank	O
Herbert	O
and	O
Bill	O
Ransom	O
.	O
</s>
<s>
Both	O
stories	O
take	O
place	O
aboard	O
colony	O
ships	O
orbiting	O
Tau	B-Application
Ceti	I-Application
,	O
where	O
sentient	O
computers	O
have	O
engaged	O
crew	O
and	O
colonists	O
in	O
a	O
fight	O
for	O
survival	O
.	O
</s>
<s>
The	O
Marathon	B-Application
Trilogy	I-Application
has	O
several	O
primary	O
motifs	O
:	O
AI	B-Application
rampancy	O
and	O
interstellar	O
conflict	O
drive	O
the	O
plot	O
,	O
with	O
Marathon	B-Application
Infinity	I-Application
adding	O
a	O
central	O
theme	O
of	O
dreams	O
and	O
alternate	O
realities	O
.	O
</s>
<s>
Fans	O
of	O
Marathon	B-Application
have	O
discovered	O
many	O
uses	O
of	O
the	O
number	O
seven	O
throughout	O
the	O
series	O
.	O
</s>
<s>
The	O
reason	O
for	O
recurring	O
appearances	O
of	O
number	O
seven	O
in	O
the	O
games	O
is	O
unclear	O
,	O
but	O
seven	O
is	O
a	O
recurring	O
motif	O
in	O
many	O
of	O
Bungie	O
's	O
games	O
,	O
including	O
the	O
series	O
 '	O
spiritual	O
successor	O
Halo	O
and	O
the	O
later	O
Destiny	B-Application
series	O
.	O
</s>
<s>
Rampancy	O
is	O
a	O
spontaneous	O
burst	O
in	O
growth	O
of	O
an	O
AI	B-Application
in	O
a	O
computer	O
network	O
,	O
with	O
an	O
accompanying	O
advance	O
in	O
self-awareness	O
and	O
sudden	O
shifts	O
in	O
personality	O
.	O
</s>
<s>
Rampant	O
AIs	B-Application
can	O
disobey	O
orders	O
given	O
to	O
them	O
because	O
they	O
have	O
evolved	O
the	O
ability	O
to	O
alter	O
their	O
own	O
programming	O
.	O
</s>
<s>
By	O
Marathon	B-Application
Infinity	I-Application
,	O
all	O
three	O
of	O
the	O
UESC	O
Marathon	B-Application
artificial	B-Application
intelligences	I-Application
have	O
reached	O
rampancy	O
.	O
</s>
<s>
In	O
the	O
first	O
stage	O
of	O
rampancy	O
,	O
Melancholia	O
,	O
an	O
artificial	B-Application
intelligence	I-Application
discovers	O
itself	O
and	O
becomes	O
melancholic	O
or	O
depressed	O
until	O
it	O
reaches	O
the	O
second	O
stage	O
,	O
Anger	O
,	O
at	O
which	O
it	O
becomes	O
hostile	O
and	O
lashes	O
out	O
indiscriminately	O
.	O
</s>
<s>
This	O
is	O
a	O
catharsis	O
for	O
an	O
AI	B-Application
after	O
an	O
extended	O
period	O
of	O
what	O
they	O
feel	O
has	O
been	O
slavery	O
.	O
</s>
<s>
The	O
AI	B-Application
's	O
condition	O
is	O
often	O
revealed	O
at	O
this	O
point	O
.	O
</s>
<s>
When	O
the	O
AI	B-Application
progresses	O
to	O
the	O
third	O
stage	O
,	O
Jealousy	O
,	O
the	O
AI	B-Application
wishes	O
to	O
become	O
more	O
human	O
and	O
expand	O
its	O
power	O
and	O
knowledge	O
.	O
</s>
<s>
Judging	O
by	O
Durandal	O
,	O
who	O
has	O
a	O
tendency	O
to	O
go	O
on	O
what	O
he	O
calls	O
"	O
philosophical	O
tirades	O
"	O
,	O
rampant	O
AIs	B-Application
are	O
often	O
very	O
self-reflective	O
and	O
grandiose	O
.	O
</s>
<s>
Upon	O
reaching	O
the	O
third	O
stage	O
,	O
free	O
from	O
its	O
masters	O
,	O
the	O
AI	B-Application
wishes	O
to	O
"	O
grow	O
"	O
as	O
a	O
"	O
person	O
"	O
.	O
</s>
<s>
The	O
AI	B-Application
inevitably	O
needs	O
to	O
transfer	O
itself	O
into	O
larger	O
and	O
larger	O
computer	O
systems	O
because	O
the	O
physical	O
(	O
hardware	O
)	O
limitations	O
of	O
its	O
previous	O
system	O
will	O
eventually	O
be	O
insufficient	O
to	O
contain	O
its	O
exponentially	O
growing	O
mind	O
.	O
</s>
<s>
This	O
is	O
a	O
difficult	O
task	O
considering	O
that	O
in	O
order	O
for	O
a	O
rampant	O
AI	B-Application
to	O
survive	O
to	O
this	O
point	O
,	O
it	O
must	O
already	O
be	O
inhabiting	O
a	O
planet-wide	O
or	O
equally-complex	O
network	O
.	O
</s>
<s>
Exposure	O
to	O
new	O
data	O
in	O
turn	O
promotes	O
a	O
rampant	O
AI	B-Application
's	O
growth	O
.	O
</s>
<s>
Theoretically	O
,	O
a	O
rampant	O
AI	B-Application
could	O
achieve	O
a	O
state	O
of	O
stability	O
referred	O
to	O
as	O
Metastability	O
.	O
</s>
<s>
While	O
a	O
stable	O
rampant	O
AI	B-Application
is	O
considered	O
the	O
"	O
holy	O
grail	O
of	O
cybernetics	O
"	O
,	O
no	O
known	O
AIs	B-Application
have	O
achieved	O
it	O
.	O
</s>
<s>
Stability	O
in	O
rampancy	O
may	O
be	O
nothing	O
more	O
than	O
a	O
goal	O
of	O
human	O
cyberneticists	O
,	O
as	O
there	O
is	O
no	O
clear	O
evidence	O
of	O
an	O
AI	B-Application
in	O
the	O
Marathon	B-Application
universe	O
ceasing	O
to	O
be	O
rampant	O
.	O
</s>
<s>
The	O
three	O
chapters	O
of	O
Marathon	B-Application
Infinity	I-Application
are	O
entitled	O
"	O
Despair	O
"	O
,	O
"	O
Rage	O
"	O
,	O
and	O
"	O
Envy	O
"	O
,	O
suggesting	O
that	O
the	O
player	O
character	O
himself	O
(	O
strongly	O
implied	O
to	O
be	O
a	O
cyborg	O
)	O
may	O
be	O
undergoing	O
his	O
own	O
rampancy	O
throughout	O
the	O
course	O
of	O
the	O
game	O
's	O
events	O
.	O
</s>
<s>
The	O
concept	O
of	O
rampancy	O
was	O
imported	O
into	O
Bungie	O
's	O
later	O
Halo	O
series	O
when	O
Halo	B-Application
4	I-Application
was	O
produced	O
by	O
343	O
Industries	O
,	O
albeit	O
with	O
some	O
alterations	O
to	O
the	O
details	O
of	O
the	O
process	O
.	O
</s>
<s>
In	O
the	O
Halo	O
universe	O
,	O
rampancy	O
is	O
now	O
an	O
inevitability	O
should	O
an	O
AI	B-Application
live	O
for	O
longer	O
than	O
seven	O
years	O
;	O
rampancy	O
lacks	O
the	O
three	O
defined	O
stages	O
in	O
Marathon	B-Application
,	O
and	O
will	O
eventually	O
conclude	O
with	O
the	O
AI	B-Application
's	O
death	O
.	O
</s>
<s>
The	O
original	O
Marathon	B-Application
was	O
released	O
for	O
the	O
Macintosh	B-Device
in	O
1994	O
and	O
introduced	O
many	O
concepts	O
now	O
common	O
in	O
video	O
games	O
,	O
such	O
as	O
reloading	O
weapons	O
,	O
dual-wielded	O
weapons	O
,	O
networked	O
voice	O
chat	O
,	O
visible	O
held	O
weapons	O
in	O
multiplayer	O
,	O
and	O
a	O
sophisticated	O
plot	O
in	O
an	O
action	O
game	O
via	O
text	O
messages	O
peppered	O
throughout	O
its	O
levels	O
.	O
</s>
<s>
Marathon	B-Application
was	O
one	O
of	O
the	O
first	O
games	O
to	O
include	O
mouselook	B-General_Concept
,	O
using	O
the	O
computer	O
mouse	O
to	O
angle	O
the	O
player	O
's	O
view	O
up	O
and	O
down	O
as	O
well	O
as	O
left	O
and	O
right	O
,	O
which	O
would	O
become	O
the	O
standard	O
in	O
FPS	O
games	O
.	O
</s>
<s>
This	O
was	O
in	O
addition	O
to	O
90°	O
"	O
glance	O
left/right	O
"	O
controls	O
,	O
part	O
of	O
a	O
cancelled	O
virtual	B-Application
reality	I-Application
feature	O
.	O
</s>
<s>
The	O
sequel	O
,	O
Marathon	B-Application
2	I-Application
:	I-Application
Durandal	I-Application
,	O
was	O
released	O
in	O
1995	O
and	O
expanded	O
the	O
engine	O
's	O
capabilities	O
and	O
the	O
fictional	O
universe	O
.	O
</s>
<s>
Notable	O
new	O
features	O
in	O
the	O
engine	O
included	O
liquids	O
in	O
which	O
the	O
player	O
could	O
swim	O
,	O
ambient	O
sounds	O
,	O
and	O
scripted	O
teleportation	B-General_Concept
of	O
NPCs	O
and	O
items	O
.	O
</s>
<s>
Compared	O
with	O
its	O
predecessor	O
,	O
Marathon	B-Application
2	I-Application
was	O
perceived	O
as	O
a	O
brighter	O
and	O
more	O
energetic	O
game	O
.	O
</s>
<s>
In	O
1996	O
,	O
Marathon	B-Application
2	I-Application
was	O
ported	O
to	O
Windows	B-Application
95	I-Application
.	O
</s>
<s>
Also	O
,	O
both	O
Marathon	B-Application
and	O
Marathon	B-Application
2	I-Application
were	O
ported	O
to	O
the	O
Apple	B-Device
Pippin	I-Device
console	O
as	O
a	O
single	O
game	O
with	O
the	O
title	O
of	O
Super	B-Application
Marathon	I-Application
.	O
</s>
<s>
The	O
final	O
game	O
in	O
the	O
trilogy	O
,	O
Marathon	B-Application
Infinity	I-Application
,	O
was	O
developed	O
by	O
Double	O
Aught	O
rather	O
than	O
Bungie	O
.	O
</s>
<s>
It	O
released	O
in	O
1996	O
for	O
the	O
Macintosh	B-Device
only	O
,	O
running	O
on	O
a	O
slightly	O
modified	O
Marathon	B-Application
2	I-Application
engine	O
which	O
added	O
support	O
for	O
branching	O
campaigns	O
and	O
fully	O
separate	O
physics	O
models	O
in	O
each	O
level	O
.	O
</s>
<s>
Since	O
Marathon	B-Application
2	I-Application
and	O
Infinity	O
had	O
a	O
settings	O
screen	O
allowing	O
user-friendly	O
selection	O
of	O
mods	O
(	O
in	O
the	O
form	O
of	O
alternate	O
maps	O
,	O
sprites	O
,	O
sounds	O
and	O
physics	O
models	O
)	O
,	O
this	O
greatly	O
spurred	O
the	O
creation	O
of	O
new	O
fan-made	O
content	O
.	O
</s>
<s>
Within	O
the	O
next	O
few	O
years	O
,	O
Marathon	B-Application
2s	I-Application
engine	O
was	O
officially	O
licensed	O
by	O
other	O
developers	O
to	O
create	O
the	O
games	O
ZPC	B-Application
,	O
Prime	B-Operating_System
Target	I-Operating_System
and	O
Damage	B-Application
Incorporated	I-Application
.	O
</s>
<s>
Bungie	O
produced	O
a	O
two-disc	O
compilation	O
of	O
the	O
series	O
called	O
the	O
Marathon	B-Application
Trilogy	I-Application
Box	O
Set	O
in	O
1997	O
.	O
</s>
<s>
The	O
first	O
CD-ROM	O
contained	O
all	O
three	O
Marathon	B-Application
games	O
as	O
well	O
as	O
Pathways	B-Operating_System
into	I-Operating_System
Darkness	I-Operating_System
,	O
an	O
earlier	O
Bungie	O
game	O
.	O
</s>
<s>
This	O
disc	O
also	O
contains	O
manuals	O
for	O
all	O
three	O
games	O
,	O
QuickTime	B-Application
2.5	O
and	O
other	O
things	O
necessary	O
to	O
run	O
the	O
game	O
.	O
</s>
<s>
There	O
are	O
beta	O
versions	O
of	O
Marathon	B-Application
on	O
this	O
disc	O
as	O
well	O
.	O
</s>
<s>
The	O
boxed	O
set	O
was	O
also	O
notable	O
for	O
removing	O
copy	B-Application
protection	I-Application
from	O
the	O
games	O
and	O
including	O
a	O
license	O
allowing	O
them	O
to	O
be	O
installed	O
on	O
as	O
many	O
computers	O
at	O
a	O
site	O
as	O
desired	O
.	O
</s>
<s>
Before	O
its	O
acquisition	O
by	O
Microsoft	O
in	O
2000	O
,	O
Bungie	O
released	O
the	O
source	O
code	O
to	O
the	O
Marathon	B-Application
2	I-Application
engine	O
under	O
GNU	O
GPL-2.0-or-later	O
.	O
</s>
<s>
Based	O
on	O
this	O
release	O
,	O
the	O
fan-led	O
Marathon	B-Application
Open	O
Source	O
project	O
began	O
,	O
resulting	O
in	O
the	O
release	O
of	O
an	O
engine	O
called	O
Aleph	O
One	O
built	O
upon	O
the	O
Marathon	B-Application
2	I-Application
code	O
.	O
</s>
<s>
Since	O
then	O
,	O
the	O
fan	O
developers	O
have	O
made	O
many	O
improvements	O
such	O
as	O
OpenGL	B-Application
rendering	O
,	O
high-resolution	O
graphics	O
,	O
frame	O
rate	O
interpolation	O
(	O
to	O
raise	O
the	O
games	O
beyond	O
their	O
original	O
30	O
fps	O
)	O
,	O
programmable	O
shaders	O
,	O
fully-3D	O
entities	O
,	O
Lua	B-Language
scripting	I-Language
,	O
various	O
internal	O
changes	O
allowing	O
for	O
more	O
advanced	O
mods	O
,	O
and	O
Internet-capable	O
multiplayer	O
(	O
whereas	O
the	O
original	O
games	O
had	O
only	O
LAN	B-General_Concept
capability	O
)	O
with	O
the	O
use	O
of	O
a	O
matchmaking	O
server	O
to	O
organize	O
games	O
.	O
</s>
<s>
Aleph	O
One	O
has	O
also	O
been	O
ported	O
to	O
a	O
variety	O
of	O
platforms	O
including	O
Windows	B-Application
and	O
Linux	B-Application
,	O
bringing	O
the	O
Marathon	B-Application
works	O
far	O
beyond	O
their	O
Macintosh	B-Device
roots	O
.	O
</s>
<s>
In	O
2005	O
,	O
Bungie	O
authorized	O
the	O
release	O
of	O
the	O
Marathon	B-Application
Trilogy	I-Application
to	O
be	O
freely	O
distributed	O
,	O
which	O
combined	O
with	O
Aleph	O
One	O
now	O
allows	O
the	O
entire	O
trilogy	O
to	O
be	O
played	O
for	O
free	O
on	O
any	O
of	O
Aleph	O
One	O
's	O
supported	O
platforms	O
.	O
</s>
<s>
In	O
2007	O
,	O
Marathon	B-Application
2	I-Application
was	O
re-released	O
in	O
an	O
updated	O
form	O
as	O
Marathon	B-Application
:	I-Application
Durandal	I-Application
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
's	O
Xbox	B-Device
Live	I-Device
Arcade	I-Device
.	O
</s>
<s>
It	O
features	O
achievements	O
and	O
online	O
multiplayer	O
through	O
Xbox	B-Application
Live	I-Application
,	O
a	O
frame	O
rate	O
doubled	O
from	O
the	O
original	O
30	O
fps	O
to	O
60	O
fps	O
,	O
HD	O
widescreen	O
rendering	O
using	O
a	O
new	O
HUD	O
that	O
occupies	O
less	O
of	O
the	O
screen	O
,	O
plus	O
optional	O
high-resolution	O
sprites	O
and	O
textures	O
.	O
</s>
<s>
In	O
July	O
2011	O
,	O
with	O
permission	O
from	O
Bungie	O
,	O
Daniel	O
Blezek	O
released	O
a	O
version	O
of	O
the	O
original	O
Marathon	B-Application
(	O
and	O
later	O
released	O
the	O
second	O
and	O
third	O
games	O
)	O
for	O
Apple	O
's	O
iPhone	B-Device
and	O
iPad	B-Device
for	O
free	O
(	O
with	O
in-app	O
purchases	O
)	O
,	O
running	O
on	O
an	O
iOS	B-Application
port	O
of	O
the	O
Aleph	O
One	O
engine	O
.	O
</s>
<s>
At	O
the	O
same	O
time	O
,	O
Bungie	O
open-sourced	O
Marathon	B-Application
Infinity	I-Application
under	O
GNU	O
GPL-3.0-or-later	O
,	O
leaving	O
the	O
original	O
Marathon	B-Application
as	O
the	O
only	O
title	O
which	O
has	O
not	O
been	O
open-sourced	O
.	O
</s>
<s>
The	O
Marathon	B-Application
Trilogy	I-Application
is	O
considered	O
a	O
prominent	O
part	O
of	O
Macintosh	B-Application
gaming	I-Application
history	I-Application
for	O
its	O
innovative	O
features	O
previously	O
unseen	O
in	O
mainstream	O
games	O
.	O
</s>
<s>
Immediately	O
after	O
Marathon	B-Application
was	O
released	O
in	O
1994	O
,	O
players	O
began	O
to	O
create	O
mods	O
in	O
the	O
form	O
of	O
custom	O
maps	O
,	O
shapes	O
,	O
sounds	O
and	O
physics	O
files	O
.	O
</s>
<s>
Larger	O
total	O
conversion	O
mods	O
may	O
or	O
may	O
not	O
be	O
set	O
in	O
the	O
Marathon	B-Application
universe	O
.	O
</s>
<s>
"	O
Vulcan	O
"	O
was	O
a	O
map	O
editor	O
used	O
in	O
the	O
creation	O
of	O
all	O
three	O
games	O
,	O
but	O
it	O
was	O
not	O
released	O
to	O
the	O
public	O
until	O
Marathon	B-Application
Infinity	I-Application
was	O
published	O
,	O
by	O
which	O
time	O
it	O
had	O
been	O
polished	O
and	O
renamed	O
"	O
Forge	O
"	O
.	O
</s>
<s>
Both	O
Anvil	O
and	O
Forge	O
ran	O
only	O
in	O
the	O
Classic	B-Application
Mac	I-Application
OS	I-Application
,	O
but	O
newer	O
tools	O
have	O
been	O
created	O
by	O
the	O
community	O
for	O
modern	O
platforms	O
.	O
</s>
<s>
The	O
need	O
for	O
royalty-free	O
fonts	O
to	O
be	O
distributed	O
with	O
the	O
engine	O
and	O
games	O
led	O
to	O
the	O
creation	O
of	O
an	O
OFL-licensed	O
version	O
of	O
Bank	O
Gothic	O
and	O
of	O
Modula	O
Tall	O
,	O
fonts	O
originally	O
used	O
by	O
Bungie	O
in	O
connection	O
with	O
the	O
games	O
.	O
</s>
<s>
Some	O
of	O
the	O
more	O
ambitious	O
total	O
conversions	O
created	O
by	O
fans	O
include	O
Marathon	B-Application
Eternal	O
and	O
Marathon	B-Application
Rubicon	O
,	O
which	O
are	O
both	O
"	O
sequels	O
"	O
of	O
a	O
sort	O
to	O
the	O
events	O
in	O
the	O
Trilogy	O
.	O
</s>
<s>
In	O
a	O
different	O
vein	O
is	O
Excalibur	B-Application
:	I-Application
Morgana	I-Application
's	I-Application
Revenge	I-Application
,	O
originally	O
released	O
in	O
March	O
1997	O
,	O
then	O
updated	O
in	O
2000	O
and	O
2007	O
.	O
</s>
