<s>
Interstellar	B-Application
Marines	I-Application
is	O
a	O
science	O
fiction	O
first-person	O
shooter	O
video	O
game	O
being	O
developed	O
by	O
indie	O
studio	O
Zero	O
Point	O
Software	O
.	O
</s>
<s>
Interstellar	B-Application
Marines	I-Application
is	O
being	O
developed	O
in	O
four	O
acts	O
,	O
formerly	O
planned	O
as	O
individual	O
titles	O
.	O
</s>
<s>
It	O
claims	O
to	O
pay	O
homage	O
to	O
old-school	O
tactical	O
first	O
person	O
shooters	O
like	O
Rainbow	B-Application
Six	I-Application
3	I-Application
:	I-Application
Raven	I-Application
Shield	I-Application
and	O
cites	O
System	B-Application
Shock	I-Application
2	I-Application
and	O
Deus	B-Application
Ex	I-Application
for	O
their	O
action	B-Application
RPG	I-Application
elements	O
and	O
open-ended	O
levels	O
,	O
as	O
well	O
as	O
Half-Life	B-Application
for	O
its	O
first	O
person	O
narrative-driven	O
storytelling	O
.	O
</s>
<s>
Bullseye	O
which	O
is	O
a	O
shooting	O
range	O
minigame	O
where	O
the	O
player	O
is	O
guided	O
by	O
an	O
artificial	B-Application
intelligence	I-Application
in	O
order	O
to	O
complete	O
graded	O
objectives	O
.	O
</s>
<s>
Deadlock	O
which	O
was	O
the	O
last	O
demo	O
to	O
be	O
released	O
and	O
was	O
the	O
precursor	O
to	O
the	O
version	O
of	O
Interstellar	B-Application
Marines	I-Application
released	O
on	O
Steam	O
Early	O
Access	O
.	O
</s>
<s>
Development	O
of	O
Interstellar	B-Application
Marines	I-Application
began	O
in	O
May	O
,	O
2005	O
under	O
the	O
working	O
title	O
Project	O
IM	O
.	O
</s>
<s>
It	O
was	O
initially	O
planned	O
for	O
release	O
on	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
,	O
with	O
the	O
game	O
being	O
built	O
using	O
Epic	O
Games	O
 '	O
Unreal	B-Operating_System
Engine	I-Operating_System
.	O
</s>
<s>
Development	O
restarted	O
with	O
the	O
Unity	B-Application
game	I-Application
engine	I-Application
in	O
2009	O
.	O
</s>
<s>
Interstellar	B-Application
Marines	I-Application
was	O
greenlit	O
through	O
Steam	O
Greenlight	O
on	O
September	O
3	O
,	O
2012	O
.	O
</s>
<s>
Between	O
the	O
Steam	O
release	O
in	O
2013	O
and	O
the	O
end	O
of	O
2015	O
,	O
Zero	O
Point	O
Software	O
released	O
24	O
major	O
game	O
updates	O
for	O
Interstellar	B-Application
Marines	I-Application
.	O
</s>
