<s>
Notpron	B-Application
(	O
originally	O
stylized	O
as	O
Not	O
Pr0n	O
)	O
is	O
an	O
online	O
puzzle	O
game	O
and	O
internet	O
riddle	O
created	O
in	O
2004	O
by	O
German	O
game	O
developer	O
David	O
Münnich	O
.	O
</s>
<s>
Regarded	O
as	O
one	O
of	O
the	O
first	O
of	O
the	O
online	O
puzzle	O
game	O
genre	O
,	O
Notpron	B-Application
follows	O
a	O
standard	O
puzzle	O
game	O
layout	O
,	O
where	O
the	O
player	O
is	O
presented	O
with	O
a	O
webpage	O
containing	O
a	O
riddle	O
and	O
must	O
find	O
the	O
answer	O
to	O
the	O
riddle	O
in	O
order	O
to	O
proceed	O
to	O
the	O
next	O
webpage	O
.	O
</s>
<s>
The	O
game	O
has	O
a	O
total	O
of	O
138	O
"	O
levels	O
"	O
,	O
ranging	O
from	O
82	O
"	O
positive	O
"	O
levels	O
,	O
44	O
"	O
negative	O
"	O
levels	O
,	O
and	O
12	O
"	O
Greek	O
"	O
levels	O
(	O
Ranging	O
from	O
"	O
Alpha	B-Language
"	O
to	O
"	O
Lambda	B-General_Concept
"	O
)	O
.	O
</s>
<s>
Each	O
level	O
answer	O
or	O
solution	O
is	O
unique	O
,	O
often	O
requiring	O
specific	O
skills	O
such	O
as	O
decoding	O
ciphers	B-Application
,	O
image	B-Application
editing	I-Application
,	O
musical	O
knowledge	O
,	O
and	O
formerly	O
remote	O
viewing	O
.	O
</s>
<s>
Inspired	O
by	O
a	O
game	O
he	O
played	O
online	O
entitled	O
"	O
This	O
is	O
not	O
Porn	O
"	O
,	O
Münnich	O
created	O
the	O
first	O
five	O
levels	O
in	O
2004	O
,	O
put	O
them	O
in	O
a	O
folder	O
temporarily	O
called	O
"	O
notpron	B-Application
"	O
,	O
and	O
posted	O
it	O
on	O
his	O
website	O
.	O
</s>
