<s>
Ken	B-Application
's	I-Application
Labyrinth	I-Application
is	O
a	O
first-person	O
shooter	O
for	O
MS-DOS	B-Application
published	O
in	O
1993	O
by	O
Epic	O
MegaGames	O
.	O
</s>
<s>
It	O
was	O
programmed	O
by	O
Ken	O
Silverman	O
,	O
who	O
later	O
designed	O
the	O
Build	B-Application
engine	I-Application
used	O
for	O
rendering	O
in	O
3D	O
Realms	O
's	O
Duke	B-Application
Nukem	I-Application
3D	I-Application
(	O
1996	O
)	O
.	O
</s>
<s>
Ken	B-Application
's	I-Application
Labyrinth	I-Application
consists	O
of	O
three	O
episodes	O
,	O
the	O
first	O
of	O
which	O
was	O
released	O
as	O
shareware	B-License
.	O
</s>
<s>
Ken	B-Application
's	I-Application
Labyrinth	I-Application
is	O
graphically	O
similar	O
to	O
id	O
Software	O
's	O
Wolfenstein	B-Application
3D	I-Application
in	O
that	O
the	O
levels	O
were	O
designed	O
using	O
a	O
grid-based	O
plane	O
,	O
resulting	O
in	O
perpendicular	O
walls	O
and	O
textureless	O
floors	O
and	O
ceilings	O
.	O
</s>
<s>
This	O
move	O
towards	O
engines	O
allowing	O
greater	O
interactivity	O
was	O
later	O
elaborated	O
upon	O
by	O
Silverman	O
's	O
Build	B-Application
engine	I-Application
.	O
</s>
<s>
Ken	B-Application
's	I-Application
Labyrinth	I-Application
was	O
released	O
as	O
freeware	B-License
on	O
November	O
16	O
,	O
1999	O
.	O
</s>
<s>
The	O
first	O
version	O
to	O
be	O
released	O
was	O
a	O
modified	O
version	O
of	O
Walken	O
called	O
Ken	B-Application
's	I-Application
Labyrinth	I-Application
.	O
</s>
<s>
A	O
Ken	B-Application
's	I-Application
Labyrinth	I-Application
port	O
to	O
modern	O
operating	O
systems	O
such	O
as	O
Windows	B-Application
and	O
Linux	B-Application
using	O
Simple	B-Operating_System
DirectMedia	I-Operating_System
Layer	I-Operating_System
called	O
LAB3D/SDL	O
was	O
created	O
by	O
Jan	O
Lönnberg	O
and	O
released	O
in	O
2002	O
.	O
</s>
<s>
A	O
fork	O
of	O
that	O
version	O
also	O
exists	O
supporting	O
Nintendo	B-Application
Switch	I-Application
.	O
</s>
