<s>
The	O
studio	O
is	O
best	O
known	O
for	O
the	O
Natural	B-Application
Selection	I-Application
and	O
Subnautica	B-Application
series	O
.	O
</s>
<s>
Unknown	O
Worlds	O
was	O
formed	O
in	O
May	O
2001	O
by	O
Charlie	O
Cleveland	O
and	O
began	O
life	O
as	O
a	O
group	O
of	O
developers	O
responsible	O
for	O
the	O
development	O
of	O
the	O
high-profile	O
free	O
mod	O
for	O
Half-Life	B-Application
,	O
Natural	B-Application
Selection	I-Application
.	O
</s>
<s>
The	O
success	O
of	O
Natural	B-Application
Selection	I-Application
convinced	O
Cleveland	O
to	O
start	O
work	O
on	O
a	O
commercial	O
sequel	O
to	O
the	O
game	O
:	O
Natural	B-Application
Selection	I-Application
2	I-Application
.	O
</s>
<s>
Although	O
the	O
casual	O
games	O
market	O
is	O
not	O
the	O
intended	O
direction	O
of	O
Unknown	O
Worlds	O
,	O
Zen	O
of	O
Sudoku	O
,	O
a	O
casual	O
puzzle	O
computer	O
game	O
based	O
on	O
the	O
popular	O
logic	O
puzzle	O
Sudoku	O
,	O
was	O
created	O
in	O
November	O
2006	O
in	O
order	O
to	O
generate	O
revenue	O
towards	O
funding	O
the	O
development	O
of	O
Natural	B-Application
Selection	I-Application
2	I-Application
.	O
</s>
<s>
McGuire	O
became	O
the	O
Technical	O
Director	O
of	O
UWE	O
and	O
development	O
of	O
Natural	B-Application
Selection	I-Application
2	I-Application
began	O
in	O
earnest	O
.	O
</s>
<s>
A	O
year	O
later	O
,	O
Unknown	O
Worlds	O
released	O
Decoda	B-Application
as	O
a	O
commercial	O
debugger	O
for	O
the	O
Lua	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
This	O
application	O
was	O
created	O
to	O
aid	O
with	O
development	O
of	O
Natural	B-Application
Selection	I-Application
2	I-Application
,	O
whose	O
game	O
code	O
was	O
largely	O
being	O
written	O
in	O
Lua	B-Language
.	O
</s>
<s>
Later	O
on	O
in	O
development	O
of	O
Natural	B-Application
Selection	I-Application
2	I-Application
,	O
the	O
studio	O
announced	O
it	O
had	O
changed	O
engine	O
from	O
the	O
Source	B-Application
engine	I-Application
to	O
their	O
own	O
proprietary	O
engine	O
developed	O
in-house	O
.	O
</s>
<s>
Strader	O
had	O
been	O
a	O
previous	O
key	O
member	O
of	O
the	O
development	O
team	O
for	O
Natural	B-Application
Selection	I-Application
.	O
</s>
<s>
In	O
May	O
2009	O
,	O
Unknown	O
Worlds	O
began	O
taking	O
pre-orders	O
for	O
standard	O
and	O
special	O
edition	O
versions	O
of	O
Natural	B-Application
Selection	I-Application
2	I-Application
.	O
</s>
<s>
Natural	B-Application
Selection	I-Application
2	I-Application
was	O
released	O
on	O
31	O
October	O
2012	O
.	O
</s>
<s>
In	O
October	O
2021	O
,	O
South	O
Korean	O
video	O
game	O
developer	O
Krafton	O
,	O
known	O
for	O
having	O
developed	O
PlayerUnknown	B-Application
's	I-Application
Battlegrounds	I-Application
and	O
TERA	B-Application
,	O
announced	O
that	O
it	O
would	O
acquire	O
Unknown	O
Worlds	O
,	O
and	O
that	O
it	O
would	O
continue	O
to	O
operate	O
as	O
an	O
independent	O
game	O
studio	O
.	O
</s>
