<s>
Desktop	B-Operating_System
Tower	I-Operating_System
Defense	I-Operating_System
is	O
a	O
Flash-based	O
tower	B-Application
defense	I-Application
browser	B-Protocol
game	I-Protocol
created	O
by	O
Paul	B-Operating_System
Preece	I-Operating_System
in	O
March	O
2007	O
.	O
</s>
<s>
Desktop	B-Operating_System
Tower	I-Operating_System
Defense	I-Operating_System
is	O
available	O
in	O
an	O
English	O
,	O
Spanish	O
,	O
German	O
,	O
French	O
,	O
or	O
Italian	O
interface	O
.	O
</s>
<s>
Desktop	B-Operating_System
Tower	I-Operating_System
Defense	I-Operating_System
is	O
played	O
on	O
a	O
map	O
resembling	O
an	O
office	O
desktop	O
.	O
</s>
<s>
Unlike	O
many	O
other	O
tower	B-Application
defense	I-Application
games	I-Application
,	O
the	O
path	O
of	O
the	O
creeps	O
themselves	O
is	O
not	O
set	O
;	O
instead	O
,	O
the	O
towers	O
built	O
determine	O
the	O
path	O
of	O
the	O
creeps	O
,	O
who	O
take	O
the	O
shortest	O
path	O
they	O
can	O
find	O
to	O
the	O
exit	O
.	O
</s>
<s>
Paul	B-Operating_System
Preece	I-Operating_System
got	O
the	O
inspiration	O
for	O
Desktop	B-Operating_System
Tower	I-Operating_System
Defense	I-Operating_System
in	O
2006	O
.	O
</s>
<s>
He	O
noticed	O
a	O
lack	O
of	O
tower	B-Application
defense	I-Application
games	I-Application
that	O
allowed	O
proper	O
"	O
mazing	O
"	O
(	O
controlling	O
movement	O
of	O
enemy	O
forces	O
by	O
placing	O
towers	O
in	O
their	O
path	O
)	O
.	O
</s>
<s>
Preece	O
did	O
not	O
immediately	O
start	O
work	O
on	O
Desktop	B-Operating_System
Tower	I-Operating_System
Defense	I-Operating_System
because	O
he	O
considered	O
Flash	B-Operating_System
to	O
be	O
too	O
difficult	O
to	O
learn	O
.	O
</s>
<s>
It	O
was	O
only	O
after	O
an	O
acquaintance	O
created	O
Flash	B-Operating_System
Element	I-Operating_System
Tower	I-Operating_System
Defense	I-Operating_System
that	O
Paul	O
started	O
work	O
on	O
the	O
game	O
.	O
</s>
<s>
Starting	O
from	O
the	O
"	O
Autumn	O
Tower	B-Application
Defense	I-Application
"	O
map	O
created	O
for	O
the	O
real-time	O
strategy	O
game	O
Warcraft	B-Application
III	I-Application
,	O
Paul	B-Operating_System
Preece	I-Operating_System
created	O
a	O
simple	O
tower	B-Application
defense	I-Application
game	I-Application
that	O
could	O
be	O
played	O
using	O
only	O
a	O
browser	O
.	O
</s>
<s>
It	O
eventually	O
found	O
its	O
way	O
onto	O
several	O
Flash	B-Protocol
game	I-Protocol
sites	O
such	O
as	O
Kongregate	O
.	O
</s>
<s>
The	O
game	O
's	O
popularity	O
was	O
further	O
increased	O
by	O
exposure	O
on	O
the	O
internet	O
pop-culture	O
websites	O
Digg	B-Application
and	O
I-am-bored.com	O
.	O
</s>
<s>
It	O
is	O
now	O
available	O
on	O
MySpace	O
Games	O
,	O
and	O
as	O
part	O
of	O
the	O
MindJolt	O
collection	O
on	O
Facebook	B-Application
.	I-Application
</s>
<s>
Due	O
to	O
success	O
of	O
the	O
game	O
,	O
Paul	B-Operating_System
Preece	I-Operating_System
decided	O
to	O
leave	O
his	O
programming	O
job	O
to	O
focus	O
on	O
making	O
online	O
games	O
as	O
an	O
independent	O
game	O
developer	O
.	O
</s>
<s>
He	O
and	O
fellow	O
game	O
maker	O
David	B-Operating_System
Scott	I-Operating_System
formed	O
Casual	O
Collective	O
,	O
a	O
game	O
development	O
company	O
.	O
</s>
<s>
In	O
2012	O
,	O
Desktop	B-Operating_System
Tower	I-Operating_System
Defense	I-Operating_System
was	O
listed	O
on	O
Time	O
All-Time	O
100	O
greatest	O
video	O
games	O
list	O
.	O
</s>
<s>
In	O
early	O
2010	O
,	O
a	O
sequel	O
,	O
Desktop	O
Defender	O
,	O
was	O
made	O
available	O
on	O
Facebook	B-Application
as	O
an	O
application	O
.	O
</s>
