<s>
Marathon	B-Application
Infinity	I-Application
is	O
a	O
first-person	O
shooter	O
video	O
game	O
,	O
the	O
third	O
in	O
the	O
science	O
fiction	O
Marathon	B-Application
Trilogy	I-Application
by	O
Bungie	O
.	O
</s>
<s>
The	O
game	O
was	O
released	O
on	O
October	O
15	O
,	O
1996	O
and	O
included	O
more	O
levels	O
than	O
its	O
predecessor	O
Marathon	B-Application
2	I-Application
:	I-Application
Durandal	I-Application
.	O
</s>
<s>
Marathon	B-Application
Infinity	I-Application
,	O
unlike	O
Marathon	B-Application
2	I-Application
,	O
was	O
originally	O
released	O
only	O
for	O
the	O
Apple	B-Device
Macintosh	I-Device
.	O
</s>
<s>
However	O
,	O
Bungie	O
released	O
the	O
source	O
for	O
Marathon	B-Application
2	I-Application
in	O
1999	O
,	O
allowing	O
the	O
development	O
of	O
the	O
open-source	O
multiplatform	O
Aleph	O
One	O
engine	O
that	O
is	O
also	O
compatible	O
with	O
Infinity	O
.	O
</s>
<s>
In	O
2011	O
,	O
Bungie	O
released	O
the	O
source	O
code	O
for	O
Marathon	B-Application
Infinity	I-Application
itself	O
,	O
preceding	O
an	O
official	O
Aleph	O
One-based	O
port	O
for	O
iOS	B-Application
the	O
next	O
year	O
that	O
is	O
available	O
free	O
(	O
with	O
in-app	O
purchases	O
)	O
.	O
</s>
<s>
The	O
story	O
in	O
the	O
single-player	O
version	O
of	O
Marathon	B-Application
Infinity	I-Application
,	O
titled	O
"	O
Blood	O
Tides	O
of	O
Lh’owon	O
"	O
,	O
is	O
not	O
told	O
in	O
an	O
explicit	O
fashion	O
.	O
</s>
<s>
The	O
narrative	O
begins	O
as	O
if	O
large	O
parts	O
,	O
if	O
not	O
all	O
,	O
of	O
the	O
events	O
in	O
Marathon	B-Application
2	I-Application
had	O
not	O
happened	O
.	O
</s>
<s>
At	O
the	O
end	O
of	O
Marathon	B-Application
2	I-Application
proper	O
,	O
as	O
the	O
Pfhor	B-Application
's	O
Trih	O
Xeem	O
or	O
"	O
early	O
nova	O
"	O
device	O
is	O
fired	O
upon	O
the	O
S'pht	B-Application
System	O
's	O
sun	O
to	O
explode	O
it	O
,	O
Durandal	O
recounts	O
an	O
ancient	O
S'pht	B-Application
legend	O
in	O
which	O
a	O
chaotic	O
entity	O
known	O
as	O
the	O
W’rkncacnter	B-Application
—	O
an	O
eldritch	O
abomination	O
—	O
was	O
sealed	O
inside	O
of	O
that	O
sun	O
by	O
the	O
Jjaro	B-Application
—	O
a	O
highly	O
advanced	O
race	O
from	O
centuries	O
past	O
,	O
their	O
technology	O
being	O
the	O
only	O
remnants	O
of	O
their	O
existence	O
—	O
eons	O
ago	O
.	O
</s>
<s>
The	O
story	O
involves	O
the	O
player	O
"	O
jumping	O
"	O
between	O
alternative	O
realities	O
via	O
surreal	O
dream	O
sequences	O
,	O
seeking	O
to	O
prevent	O
the	O
W’rkncacnter	B-Application
from	O
being	O
released	O
from	O
owon	O
's	O
dying	O
sun	O
.	O
</s>
<s>
These	O
jumps	O
are	O
apparently	O
caused	O
either	O
by	O
technology	O
left	O
behind	O
by	O
the	O
Jjaro	B-Application
or	O
by	O
the	O
rkncacnter	O
's	O
chaotic	O
nature	O
.	O
</s>
<s>
The	O
player	O
begins	O
as	O
Durandal	O
's	O
ally	O
,	O
only	O
to	O
be	O
transported	O
almost	O
immediately	O
to	O
a	O
reality	O
where	O
Durandal	O
did	O
not	O
rescue	O
the	O
player	O
at	O
the	O
end	O
of	O
the	O
first	O
game	O
,	O
Marathon	B-Application
;	O
as	O
such	O
,	O
he	O
is	O
controlled	O
by	O
the	O
Pfhor-tortured	O
AI	O
Tycho	O
instead	O
.	O
</s>
<s>
There	O
are	O
four	O
sections	O
to	O
the	O
solo	O
levels	O
of	O
Marathon	B-Application
Infinity	I-Application
,	O
each	O
with	O
its	O
own	O
intro	O
screen	O
.	O
</s>
<s>
It	O
becomes	O
clear	O
to	O
the	O
player	O
as	O
the	O
game	O
progresses	O
that	O
the	O
ancient	O
Jjaro	B-Application
station	O
portrayed	O
in	O
these	O
levels	O
is	O
the	O
key	O
to	O
containing	O
the	O
W’rkncacnter	B-Application
,	O
but	O
the	O
circumstances	O
of	O
the	O
player	O
's	O
causality	O
are	O
not	O
correct	O
to	O
succeed	O
and	O
is	O
thus	O
transported	O
to	O
a	O
new	O
timeline	O
(	O
each	O
chapter	O
start	O
)	O
to	O
complete	O
the	O
necessary	O
objectives	O
first	O
.	O
</s>
<s>
The	O
ending	O
screen	O
of	O
Infinity	O
leaves	O
the	O
story	O
's	O
resolution	O
open-ended	O
,	O
taking	O
place	O
billions	O
of	O
years	O
after	O
the	O
events	O
of	O
Marathon	B-Application
Infinity	I-Application
during	O
the	O
final	O
moments	O
of	O
the	O
universe	O
.	O
</s>
<s>
It	O
can	O
be	O
surmised	O
that	O
both	O
Durandal	O
and	O
Earth	O
did	O
survive	O
in	O
the	O
original	O
timeline	O
as	O
can	O
be	O
seen	O
at	O
the	O
end	O
of	O
Marathon	B-Application
2	I-Application
.	O
</s>
<s>
This	O
location	O
does	O
not	O
appear	O
in	O
any	O
of	O
the	O
levels	O
in	O
Marathon	B-Application
,	O
Marathon	B-Application
2	I-Application
:	I-Application
Durandal	I-Application
,	O
or	O
Marathon	B-Application
Infinity	I-Application
.	O
</s>
<s>
There	O
are	O
two	O
equally	O
enigmatic	O
terminals	O
in	O
Marathon	B-Application
Infinity	I-Application
;	O
one	O
in	O
the	O
first	O
level	O
and	O
one	O
in	O
the	O
last	O
.	O
</s>
<s>
Core	O
game	O
mechanics	O
change	O
little	O
from	O
Marathon	B-Application
2	I-Application
except	O
for	O
the	O
addition	O
of	O
a	O
new	O
weapon	O
,	O
the	O
"	O
KKV-7	O
10mm	O
SMG	O
Flechette	O
"	O
.	O
</s>
<s>
Marathon	B-Application
Infinity	I-Application
utilizes	O
"	O
Vacuum	O
levels	O
"	O
a	O
great	O
deal	O
more	O
than	O
previous	O
installments	O
in	O
the	O
series	O
(	O
only	O
one	O
such	O
level	O
appeared	O
in	O
the	O
original	O
Marathon	B-Application
and	O
were	O
completely	O
absent	O
in	O
Marathon	B-Application
2	I-Application
)	O
.	O
</s>
<s>
Multiplayer	O
in	O
Marathon	B-Application
Infinity	I-Application
is	O
identical	O
to	O
the	O
second	O
game	O
,	O
except	O
for	O
new	O
maps	O
,	O
such	O
as	O
"	O
Beyond	O
Thunderdome	O
"	O
,	O
an	O
extension	O
on	O
the	O
"	O
Thunderdome	O
"	O
level	O
in	O
Marathon	B-Application
2	I-Application
.	O
</s>
<s>
Marathon	B-Application
Infinity	I-Application
also	O
contains	O
"	O
House	O
of	O
pain	O
"	O
,	O
a	O
duplicate	O
of	O
the	O
Marathon	B-Application
2	I-Application
level	O
,	O
and	O
"	O
King	O
of	O
pain	O
"	O
,	O
a	O
similar	O
level	O
to	O
"	O
House	O
of	O
pain	O
"	O
.	O
</s>
<s>
Another	O
improvement	O
was	O
the	O
ability	O
to	O
include	O
separate	O
monsters	O
,	O
weapons	O
,	O
and	O
physics	O
definitions	O
for	O
each	O
level	O
,	O
a	O
feature	O
heavily	O
used	O
by	O
Double	O
Aught	O
,	O
who	O
designed	O
the	O
Marathon	B-Application
Infinity	I-Application
levels	O
.	O
</s>
<s>
The	O
editors	O
of	O
CNET	O
Gamecenter	O
named	O
Marathon	B-Application
Infinity	I-Application
the	O
best	O
Macintosh	B-Device
game	O
of	O
1996	O
and	O
wrote	O
that	O
its	O
"	O
design	O
and	O
playability	O
 [ ... ] 	O
pushed	O
it	O
into	O
the	O
stratosphere	O
"	O
.	O
</s>
