<s>
Natural	B-Application
Selection	I-Application
2	I-Application
is	O
a	O
multiplayer	O
video	O
game	O
which	O
combines	O
first-person	O
shooter	O
and	O
real-time	O
strategy	O
rules	O
.	O
</s>
<s>
It	O
is	O
the	O
sequel	O
to	O
Natural	B-Application
Selection	I-Application
.	O
</s>
<s>
Like	O
its	O
predecessor	O
,	O
Natural	B-Application
Selection	I-Application
2	I-Application
features	O
two	O
opposing	O
teams	O
of	O
players	O
,	O
Kharaa	B-Application
(	O
Aliens	O
)	O
and	O
Frontiersmen	O
(	O
Marines	O
)	O
,	O
seeking	O
to	O
destroy	O
the	O
other	O
's	O
respective	O
base	O
.	O
</s>
<s>
The	O
primary	O
feature	O
that	O
differentiates	O
Natural	B-Application
Selection	I-Application
2	I-Application
from	O
others	O
in	O
the	O
FPS	O
genre	O
is	O
its	O
strategy	O
component	O
.	O
</s>
<s>
Buildings	O
in	O
Natural	B-Application
Selection	I-Application
are	O
designed	O
to	O
aid	O
players	O
in	O
their	O
offensive	O
,	O
defensive	O
,	O
stealth	O
and	O
speed	O
capabilities	O
.	O
</s>
<s>
For	O
a	O
team	O
to	O
achieve	O
victory	O
,	O
they	O
must	O
eliminate	O
all	O
of	O
the	O
opposing	O
team	O
command	O
structures	O
(	O
Hive	O
of	O
the	O
Kharaa	B-Application
,	O
Command	O
Station	O
of	O
the	O
Frontiersmen	O
)	O
.	O
</s>
<s>
The	O
game	O
engine	O
utilizes	O
the	O
Lua	B-Language
scripting	I-Language
language	I-Language
for	O
game	O
logic	O
,	O
allowing	O
for	O
easy	O
expansion	O
of	O
the	O
game	O
's	O
mechanics	O
.	O
</s>
<s>
It	O
was	O
to	O
be	O
developed	O
by	O
the	O
Natural	B-Application
Selection	I-Application
creator	O
's	O
newly	O
founded	O
company	O
,	O
Unknown	O
Worlds	O
.	O
</s>
<s>
Charlie	O
‘	O
Flayra’	O
Cleveland	O
will	O
continue	O
his	O
work	O
on	O
the	O
game	O
and	O
Cory	O
Strader	O
(	O
concept	O
artist	O
from	O
Natural	B-Application
Selection	I-Application
)	O
will	O
also	O
be	O
contributing	O
concept	O
artwork	O
.	O
</s>
<s>
On	O
August	O
31	O
,	O
2007	O
,	O
podcasts	B-Operating_System
by	O
Max	O
McGuire	O
and	O
Charlie	O
Cleveland	O
were	O
released	O
.	O
</s>
<s>
On	O
July	O
10	O
,	O
2008	O
,	O
Unknown	O
Worlds	O
announced	O
their	O
move	O
from	O
the	O
Source	B-Application
Engine	I-Application
to	O
an	O
in-house	O
developed	O
engine	O
dubbed	O
"	O
Spark	O
"	O
.	O
</s>
<s>
In	O
October	O
2009	O
,	O
Unknown	O
Worlds	O
confirmed	O
plans	O
to	O
support	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
Linux	B-Application
platforms	O
and	O
perhaps	O
console	O
.	O
</s>
<s>
However	O
,	O
in	O
February	O
2010	O
,	O
Max	O
McGuire	O
announced	O
that	O
OS	B-Operating_System
X	I-Operating_System
,	O
Linux	B-Application
,	O
and	O
Xbox	O
support	O
would	O
not	O
be	O
available	O
at	O
the	O
game	O
's	O
initial	O
launch	O
.	O
</s>
<s>
It	O
was	O
also	O
revealed	O
that	O
Natural	B-Application
Selection	I-Application
amassed	O
over	O
$	O
200,000	O
in	O
pre-orders	O
and	O
$	O
500,000	O
through	O
angel	O
investors	O
.	O
</s>
<s>
On	O
May	O
7	O
,	O
the	O
Engine	O
Build	O
started	O
using	O
Steam	B-Application
as	O
its	O
primary	O
distribution	O
and	O
update	O
source	O
.	O
</s>
<s>
On	O
13	O
July	O
2010	O
,	O
Unknown	O
Worlds	O
Entertainment	O
announced	O
that	O
a	O
private	O
alpha	O
was	O
to	O
be	O
released	O
through	O
Steam	B-Application
for	O
all	O
Special	O
Edition	O
pre-order	O
customers	O
on	O
26	O
July	O
2010	O
.	O
</s>
<s>
The	O
alpha	O
test	O
started	O
on	O
July	O
26	O
,	O
2010	O
,	O
with	O
those	O
who	O
pre-ordered	O
the	O
game	O
's	O
"	O
Special	O
Edition	O
"	O
able	O
to	O
activate	O
it	O
via	O
Steam	B-Application
.	O
</s>
<s>
The	O
game	O
was	O
released	O
on	O
Steam	B-Application
on	O
October	O
31	O
,	O
2012	O
.	O
</s>
<s>
On	O
February	O
14	O
,	O
2023	O
,	O
Unknown	O
Worlds	O
Entertainment	O
announced	O
that	O
the	O
active	O
development	O
of	O
Natural	B-Application
Selection	I-Application
2	I-Application
has	O
ended	O
.	O
</s>
<s>
A	O
few	O
years	O
after	O
Natural	B-Application
Selection	I-Application
2	I-Application
was	O
released	O
,	O
Unknown	O
Worlds	O
turned	O
over	O
development	O
to	O
a	O
small	O
team	O
made	O
up	O
of	O
community	O
members	O
.	O
</s>
