<s>
Urban	B-Protocol
Dead	I-Protocol
is	O
a	O
free-to-play	O
HTML/text	O
-based	O
massively	B-Protocol
multiplayer	I-Protocol
online	I-Protocol
role-playing	I-Protocol
game	I-Protocol
created	O
by	O
British	O
developer	O
Kevan	B-Protocol
Davis	I-Protocol
.	O
</s>
<s>
Set	O
in	O
a	O
quarantined	O
region	O
of	O
the	O
fictional	O
city	O
of	O
Malton	O
,	O
it	O
deals	O
with	O
the	O
aftermath	O
of	O
a	O
zombie	B-Application
outbreak	O
.	O
</s>
<s>
Players	O
enter	O
the	O
game	O
either	O
as	O
a	O
survivor	O
or	O
a	O
zombie	B-Application
,	O
each	O
with	O
different	O
abilities	O
and	O
limitations	O
.	O
</s>
<s>
Survivors	O
become	O
zombies	B-Application
when	O
they	O
are	O
killed	O
,	O
while	O
zombies	B-Application
can	O
be	O
"	O
revivified	O
"	O
with	O
appropriate	O
technology	O
,	O
returning	O
to	O
life	O
as	O
a	O
survivor	O
–	O
any	O
character	O
played	O
for	O
long	O
will	O
thus	O
spend	O
some	O
time	O
alive	O
and	O
some	O
as	O
a	O
zombie	B-Application
.	O
</s>
<s>
There	O
are	O
no	O
non-player	O
characters	O
in	O
the	O
game	O
:	O
all	O
survivors	O
and	O
zombies	B-Application
are	O
controlled	O
by	O
players	O
.	O
</s>
<s>
Urban	B-Protocol
Dead	I-Protocol
went	O
live	O
in	O
July	O
2005	O
.	O
</s>
<s>
Gameplay	O
involves	O
zombies	B-Application
breaking	O
into	O
safe	O
houses	O
and	O
attacking	O
the	O
inhabitants	O
,	O
and	O
survivors	O
trying	O
to	O
defend	O
the	O
buildings	O
by	O
barricading	O
them	O
and	O
killing	O
any	O
zombies	B-Application
present	O
.	O
</s>
<s>
Safe	O
houses	O
tend	O
to	O
be	O
located	O
in	O
or	O
near	O
buildings	O
where	O
useful	O
items	O
can	O
be	O
found	O
,	O
such	O
as	O
shopping	O
malls	O
,	O
police	O
stations	O
,	O
hospitals	O
,	O
and	O
the	O
laboratories	O
of	O
the	O
zombie-related	O
NecroTech	B-Protocol
corporation	O
.	O
</s>
<s>
Internal	O
fighting	O
between	O
survivors	O
and	O
zombies	B-Application
is	O
a	O
frequent	O
occurrence	O
.	O
</s>
<s>
Urban	B-Protocol
Dead	I-Protocol
has	O
no	O
economy	O
.	O
</s>
<s>
New	O
players	O
begin	O
the	O
game	O
as	O
one	O
of	O
the	O
three	O
survivor	O
classes	O
;	O
Military	O
,	O
Scientist	O
or	O
Civilian	O
;	O
or	O
as	O
a	O
Zombie	B-Application
.	O
</s>
<s>
Survivors	O
move	O
twice	O
as	O
fast	O
as	O
low-level	O
zombies	B-Application
and	O
are	O
able	O
to	O
employ	O
various	O
weapons	O
and	O
tools	O
.	O
</s>
<s>
Survivor	O
characters	O
can	O
communicate	O
with	O
each	O
other	O
in-game	O
via	O
speech	O
,	O
radio	O
broadcasting	O
,	O
graffiti	O
and	O
text	B-Device
messaging	I-Device
.	O
</s>
<s>
They	O
can	O
also	O
barricade	B-Application
building	O
entrances	O
,	O
keeping	O
zombies	B-Application
at	O
bay	O
.	O
</s>
<s>
Zombies	B-Application
,	O
often	O
referred	O
to	O
as	O
"	O
zeds	O
"	O
,	O
are	O
limited	O
to	O
using	O
claws	O
,	O
teeth	O
,	O
and	O
blunt	O
melee	O
weapons	O
.	O
</s>
<s>
However	O
,	O
they	O
can	O
self-revive	O
with	O
full	O
hit	O
points	O
when	O
killed	O
,	O
whereas	O
a	O
survivor	O
needs	O
another	O
player	O
to	O
revive	O
them	O
after	O
death	O
if	O
they	O
do	O
not	O
wish	O
to	O
play	O
as	O
a	O
zombie	B-Application
.	O
</s>
<s>
Higher	O
level	O
zombies	B-Application
can	O
communicate	O
with	O
each	O
other	O
via	O
a	O
crude	O
form	O
of	O
zombie	B-Application
speech	O
,	O
as	O
well	O
as	O
through	O
various	O
groaning	O
noises	O
and	O
hand	O
gestures	O
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
switch	O
sides	O
in	O
the	O
conflict	O
:	O
a	O
survivor	O
character	O
that	O
is	O
killed	O
will	O
rise	O
up	O
as	O
a	O
zombie	B-Application
,	O
and	O
zombie	B-Application
characters	O
may	O
be	O
brought	O
back	O
to	O
life	O
by	O
a	O
survivor	O
who	O
has	O
the	O
relevant	O
skills	O
and	O
items	O
.	O
</s>
<s>
When	O
a	O
character	O
's	O
action	O
points	O
drop	O
to	O
zero	O
or	O
lower	O
,	O
that	O
character	O
is	O
unable	O
to	O
perform	O
any	O
action	O
until	O
they	O
gain	O
further	O
points	O
,	O
survivors	O
fall	O
asleep	O
and	O
zombies	B-Application
 '	O
brains	O
cease	O
to	O
function	O
.	O
</s>
<s>
Should	O
a	O
survivor	O
run	O
out	O
of	O
action	O
points	O
whilst	O
in	O
an	O
unsecured	O
area	O
,	O
they	O
are	O
at	O
great	O
risk	O
of	O
attack	O
by	O
zombies	B-Application
during	O
sleep	O
.	O
</s>
<s>
The	O
use	O
of	O
Action	O
Points	O
as	O
a	O
limit	O
on	O
character	O
actions	O
is	O
similar	O
to	O
the	O
systems	O
of	O
several	O
other	O
free	O
MMORPGs	B-Protocol
such	O
as	O
Kingdom	B-Application
of	I-Application
Loathing	I-Application
.	O
</s>
<s>
While	O
survivors	O
can	O
also	O
gain	O
experience	O
from	O
performing	O
a	O
variety	O
of	O
actions	O
,	O
such	O
as	O
healing	O
other	O
characters	O
or	O
repairing	O
damage	O
to	O
buildings	O
,	O
zombies	B-Application
can	O
only	O
gain	O
experience	O
points	O
by	O
attacking	O
other	O
characters	O
or	O
objects	O
in	O
the	O
game	O
world	O
.	O
</s>
<s>
A	O
character	O
can	O
only	O
buy	O
survivor	O
skills	O
while	O
alive	O
,	O
and	O
only	O
zombie	B-Application
skills	O
while	O
dead	O
;	O
although	O
skills	O
of	O
one	O
type	O
are	O
not	O
lost	O
if	O
the	O
character	O
dies	O
or	O
is	O
revived	O
,	O
most	O
survivor	O
skills	O
cannot	O
be	O
used	O
by	O
zombies	B-Application
,	O
and	O
vice	O
versa	O
.	O
</s>
<s>
On	O
October	O
14	O
,	O
2008	O
,	O
a	O
new	O
zombie	B-Application
skill	O
"	O
Flesh	O
Rot	O
"	O
was	O
added	O
,	O
thus	O
making	O
it	O
possible	O
to	O
reach	O
level	O
43	O
.	O
</s>
<s>
Survivors	O
who	O
die	O
and	O
return	O
as	O
zombies	B-Application
do	O
not	O
have	O
to	O
switch	O
sides	O
-	O
they	O
can	O
gather	O
at	O
designated	O
"	O
revive	O
points	O
"	O
scattered	O
throughout	O
the	O
city	O
where	O
they	O
wait	O
for	O
survivors	O
with	O
the	O
relevant	O
skills	O
and	O
equipment	O
to	O
revive	O
them	O
.	O
</s>
<s>
Revive	O
points	O
are	O
considered	O
neutral	O
ground	O
and	O
survivors	O
are	O
generally	O
discouraged	O
from	O
killing	O
zombies	B-Application
found	O
there	O
.	O
</s>
<s>
Urban	B-Protocol
Dead	I-Protocol
is	O
not	O
limited	O
to	O
survivor	O
versus	O
zombie	B-Application
combat	O
,	O
groups	O
of	O
survivors	O
can	O
attack	O
other	O
survivors	O
,	O
known	O
as	O
player	O
killing	O
.	O
</s>
<s>
Within	O
the	O
game	O
,	O
this	O
is	O
viewed	O
as	O
an	O
act	O
of	O
murder	O
;	O
however	O
,	O
it	O
is	O
not	O
against	O
the	O
game	O
rules	O
and	O
is	O
seen	O
by	O
some	O
more	O
advanced	O
players	O
as	O
playing	O
the	O
game	O
on	O
"	O
Hard	O
"	O
due	O
to	O
only	O
receiving	O
half	O
the	O
experience	O
points	O
that	O
one	O
would	O
receive	O
for	O
attacking	O
zombies	B-Application
.	O
</s>
<s>
Some	O
zombie	B-Application
groups	O
use	O
living	O
characters	O
as	O
spies	O
and	O
saboteurs	O
,	O
usually	O
during	O
or	O
in	O
preparation	O
for	O
a	O
major	O
attack	O
on	O
a	O
safe	O
house	O
(	O
mainly	O
malls	O
)	O
.	O
</s>
<s>
These	O
collaborators	O
are	O
often	O
referred	O
to	O
as	O
"	O
zombie	B-Application
spies	O
"	O
or	O
"	O
death	O
cultists	O
"	O
.	O
</s>
<s>
Urban	B-Protocol
Dead	I-Protocol
was	O
created	O
by	O
Kevan	B-Protocol
Davis	I-Protocol
,	O
a	O
freelance	O
video	O
game	O
designer	O
and	O
web	O
developer	O
,	O
in	O
2005	O
.	O
</s>
<s>
These	O
were	O
combined	O
with	O
elements	O
of	O
NetHack	B-Application
,	O
MUSHes	B-Application
,	O
interactive	O
fiction	O
and	O
a	O
zombie	B-Application
infection	O
simulation	O
he	O
had	O
developed	O
in	O
2003	O
.	O
</s>
