<s>
Red	B-Application
Dead	I-Application
Redemption	I-Application
:	I-Application
Undead	I-Application
Nightmare	I-Application
is	O
a	O
standalone	O
expansion	O
pack	O
to	O
the	O
2010	O
video	O
game	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
.	O
</s>
<s>
It	O
adds	O
a	O
non-canonical	O
zombie	B-Application
horror-themed	O
single-player	O
campaign	O
,	O
two	O
multiplayer	O
modes	O
,	O
and	O
cosmetic	O
additions	O
to	O
the	O
environments	O
and	O
characters	O
of	O
the	O
open	O
world	O
Western	O
action-adventure	O
game	O
.	O
</s>
<s>
Set	O
in	O
an	O
alternate	O
timeline	O
from	O
the	O
base	O
game	O
's	O
story	O
,	O
the	O
plot	O
follows	O
returning	O
protagonist	O
John	O
Marston	O
,	O
a	O
former	O
outlaw	O
who	O
sets	O
out	O
to	O
find	O
the	O
cause	O
and	O
possible	O
cure	O
to	O
a	O
zombie	B-Application
plague	O
that	O
has	O
infected	O
his	O
wife	O
and	O
son	O
.	O
</s>
<s>
Rockstar	O
Games	O
,	O
the	O
game	O
's	O
publisher	O
,	O
had	O
a	O
long-standing	O
interest	O
in	O
creating	O
a	O
zombie	B-Application
game	O
.	O
</s>
<s>
They	O
found	O
the	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
universe	O
and	O
its	O
American	O
countryside	O
to	O
fit	O
the	O
cinematic	O
heritage	O
of	O
the	O
horror	O
film	O
genre	O
.	O
</s>
<s>
The	O
company	O
released	O
Undead	B-Application
Nightmare	I-Application
as	O
downloadable	B-Protocol
content	I-Protocol
for	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
platforms	O
on	O
October	O
26	O
,	O
2010	O
,	O
and	O
as	O
a	O
retail	O
disc	O
bundle	O
with	O
other	O
downloadable	B-Protocol
content	I-Protocol
packs	O
in	O
late	O
November	O
.	O
</s>
<s>
Undead	B-Application
Nightmare	I-Application
received	O
generally	O
favorable	O
reviews	O
at	O
its	O
release	O
,	O
and	O
the	O
retail	O
disc	O
sold	O
two	O
million	O
copies	O
by	O
2011	O
.	O
</s>
<s>
It	O
was	O
praised	O
as	O
a	O
model	O
for	O
downloadable	B-Protocol
content	I-Protocol
and	O
named	O
among	O
the	O
best	O
of	O
the	O
year	O
,	O
with	O
top	O
awards	O
from	O
the	O
2010	O
Spike	O
Video	O
Game	O
Awards	O
and	O
Shacknews	O
in	O
this	O
category	O
.	O
</s>
<s>
Critics	O
praised	O
its	O
production	O
values	O
and	O
handling	O
of	O
the	O
zombie	B-Application
video	O
game	O
motif	O
,	O
and	O
noted	O
its	O
lightheartedness	O
compared	O
to	O
the	O
main	O
game	O
,	O
although	O
some	O
reviewers	O
struggled	O
with	O
the	O
game	O
's	O
character	O
movement	O
controls	O
and	O
found	O
the	O
combat	O
unvaried	O
.	O
</s>
<s>
It	O
is	O
retrospectively	O
considered	O
to	O
be	O
among	O
the	O
best	O
downloadable	B-Protocol
content	I-Protocol
packs	O
ever	O
made	O
.	O
</s>
<s>
Undead	B-Application
Nightmare	I-Application
is	O
a	O
modified	O
expansion	O
of	O
the	O
2010	O
video	O
game	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
,	O
an	O
open	O
world	O
Western	O
action-adventure	O
in	O
which	O
the	O
former	O
outlaw	O
John	O
Marston	O
is	O
coerced	O
by	O
the	O
federal	O
government	O
to	O
capture	O
former	O
members	O
of	O
his	O
gang	O
in	O
exchange	O
for	O
his	O
family	O
's	O
freedom	O
.	O
</s>
<s>
Undead	B-Application
Nightmare	I-Application
is	O
an	O
alternate	O
timeline	O
expansion	O
that	O
adds	O
a	O
new	O
full-length	O
story	O
in	O
a	O
zombie	B-Application
horror	O
theme	O
and	O
reworks	O
the	O
base	O
game	O
's	O
environment	O
to	O
appear	O
dark	O
and	O
spooky	O
.	O
</s>
<s>
As	O
corpses	O
begin	O
to	O
rise	O
from	O
the	O
dead	O
to	O
become	O
flesh-eating	O
zombies	B-Application
,	O
some	O
of	O
the	O
living	O
go	O
into	O
hiding	O
and	O
others	O
become	O
hostile	O
.	O
</s>
<s>
As	O
in	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
,	O
the	O
player	O
can	O
diverge	O
from	O
the	O
main	O
story	O
on	O
side	O
quests	O
:	O
requests	O
from	O
strangers	O
,	O
checklist	O
challenges	O
,	O
and	O
other	O
digressions	O
.	O
</s>
<s>
These	O
missions	O
are	O
similar	O
in	O
format	O
to	O
those	O
of	O
the	O
original	O
but	O
their	O
objectives	O
are	O
replaced	O
to	O
fit	O
the	O
zombie	B-Application
horror	O
theme	O
.	O
</s>
<s>
After	O
John	O
's	O
assistance	O
,	O
the	O
towns	O
remain	O
free	O
of	O
zombies	B-Application
for	O
several	O
in-game	O
days	O
,	O
but	O
will	O
eventually	O
require	O
the	O
player	O
's	O
assistance	O
when	O
zombies	B-Application
return	O
once	O
again	O
.	O
</s>
<s>
The	O
expansion	O
's	O
zombie	B-Application
enemies	O
are	O
similar	O
to	O
that	O
of	O
other	O
games	O
.	O
</s>
<s>
"	O
Walker	O
"	O
zombies	B-Application
are	O
slow	O
from	O
afar	O
but	O
run	O
when	O
they	O
near	O
the	O
character	O
.	O
</s>
<s>
Fat	O
zombies	B-Application
attempt	O
to	O
knock	O
the	O
player-character	O
down	O
and	O
others	O
spew	O
green	O
venom	O
.	O
</s>
<s>
John	O
has	O
new	O
weapons	O
,	O
including	O
holy	O
water	O
,	O
bait	O
for	O
the	O
undead	O
,	O
and	O
a	O
blunderbuss	O
that	O
uses	O
zombie	B-Application
parts	O
as	O
ammunition	O
.	O
</s>
<s>
For	O
example	O
,	O
John	O
can	O
bait	O
a	O
group	O
to	O
an	O
area	O
to	O
set	O
off	O
a	O
bomb	O
,	O
use	O
the	O
time-slowing	O
Dead	O
Eye	O
mode	O
to	O
shoot	O
each	O
in	O
the	O
head	O
,	O
or	O
eliminate	O
enemies	O
from	O
a	O
roof	O
because	O
zombies	B-Application
cannot	O
climb	O
.	O
</s>
<s>
Undead	B-Application
Nightmare	I-Application
removes	O
the	O
traditional	O
fast	O
travel	O
features	O
of	O
the	O
base	O
game	O
,	O
and	O
this	O
encourages	O
the	O
player	O
to	O
use	O
settlements	O
to	O
store	O
their	O
caravan	O
.	O
</s>
<s>
John	O
rides	O
undead	O
horses	O
in	O
Undead	B-Application
Nightmare	I-Application
,	O
which	O
he	O
can	O
summon	O
by	O
whistling	O
.	O
</s>
<s>
Other	O
mythical	O
creatures	O
to	O
hunt	O
include	O
Sasquatch	O
,	O
El	O
Chupacabra	O
,	O
and	O
a	O
unicorn	B-Application
.	O
</s>
<s>
Apart	O
from	O
the	O
single-player	O
story	O
,	O
Undead	B-Application
Nightmare	I-Application
adds	O
two	O
multiplayer	O
modes	O
:	O
Undead	O
Overrun	O
and	O
Land	O
Grab	O
.	O
</s>
<s>
The	O
former	O
is	O
a	O
horde	O
mode	O
in	O
which	O
up	O
to	O
four	O
players	O
cooperatively	O
fight	O
off	O
waves	O
of	O
zombies	B-Application
.	O
</s>
<s>
While	O
players	O
with	O
the	O
base	O
game	O
can	O
join	O
in	O
Land	O
Grab	O
games	O
,	O
only	O
Undead	B-Application
Nightmare	I-Application
owners	O
can	O
initiate	O
them	O
.	O
</s>
<s>
In	O
the	O
middle	O
of	O
the	O
night	O
,	O
they	O
are	O
awakened	O
by	O
a	O
zombified	B-Application
Uncle	O
that	O
bites	O
Abigail	O
,	O
who	O
proceeds	O
to	O
bite	O
Jack	O
,	O
also	O
turning	O
them	O
into	O
zombies	B-Application
.	O
</s>
<s>
After	O
MacDougal	O
is	O
killed	O
by	O
an	O
undead	O
Nastas	O
,	O
John	O
encounters	O
other	O
survivors	O
and	O
helps	O
clear	O
Blackwater	O
and	O
the	O
nearby	O
cemetery	O
of	O
the	O
undead	O
,	O
before	O
learning	O
that	O
another	O
two	O
of	O
his	O
former	O
allies	O
,	O
con	O
artist	O
Nigel	O
West	O
Dickens	O
(	O
Don	O
Creech	O
)	O
and	O
treasure	B-Application
hunter	I-Application
Seth	O
Briars	O
(	O
Kevin	O
Glikmann	O
)	O
,	O
are	O
supposedly	O
responsible	O
for	O
the	O
outbreak	O
.	O
</s>
<s>
He	O
meets	O
with	O
both	O
men	O
,	O
who	O
deny	O
any	O
involvement	O
,	O
although	O
Seth	O
voices	O
his	O
suspicions	O
that	O
the	O
Aztecs	B-Application
had	O
something	O
to	O
do	O
with	O
the	O
entire	O
ordeal	O
and	O
tells	O
John	O
to	O
travel	O
to	O
Mexico	O
.	O
</s>
<s>
When	O
John	O
goes	O
to	O
meet	O
with	O
said	O
woman	O
,	O
he	O
finds	O
her	O
attacked	O
by	O
a	O
zombified	B-Application
Reyes	O
,	O
whom	O
he	O
kills	O
.	O
</s>
<s>
The	O
woman	O
informs	O
John	O
that	O
Reyes	O
triggered	O
the	O
zombie	B-Application
plague	O
when	O
he	O
stole	O
an	O
Aztec	B-Application
mask	O
from	O
some	O
tombs	O
,	O
and	O
became	O
a	O
zombie	B-Application
himself	O
when	O
he	O
donned	O
the	O
mask	O
.	O
</s>
<s>
The	O
woman	O
then	O
reveals	O
herself	O
as	O
the	O
Aztec	B-Application
goddess	O
Ayauhteotl	O
and	O
thanks	O
John	O
for	O
his	O
help	O
,	O
gifting	O
him	O
one	O
of	O
the	O
four	O
horses	O
of	O
Apocalypse	O
to	O
return	O
home	O
.	O
</s>
<s>
John	O
is	O
among	O
those	O
resurrected	O
,	O
but	O
because	O
he	O
was	O
buried	O
with	O
holy	O
water	O
,	O
he	O
is	O
now	O
a	O
revenant	B-Application
,	O
keeping	O
possession	O
of	O
his	O
soul	O
.	O
</s>
<s>
Following	O
the	O
2010	O
release	O
of	O
the	O
base	O
game	O
,	O
Rockstar	O
San	O
Diego	O
prepared	O
and	O
released	O
a	O
series	O
of	O
downloadable	B-Protocol
content	I-Protocol
packs	O
,	O
of	O
which	O
Undead	B-Application
Nightmare	I-Application
was	O
one	O
.	O
</s>
<s>
The	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
world	O
was	O
designed	O
to	O
be	O
not	O
necessarily	O
serious	O
but	O
within	O
the	O
Western	O
genre	O
without	O
regressing	O
to	O
"	O
cheesy	O
or	O
camp	O
"	O
pastiche	O
.	O
</s>
<s>
The	O
team	O
balanced	O
the	O
"	O
inherently	O
ridiculous	O
"	O
zombie	B-Application
concept	O
with	O
their	O
horror	O
aspects	O
and	O
some	O
self-aware	O
humor	O
.	O
</s>
<s>
In	O
the	O
game	O
's	O
canon	O
,	O
the	O
Undead	B-Application
Nightmare	I-Application
scenario	O
fits	O
in	O
the	O
time	O
between	O
when	O
John	O
Marston	O
returns	O
home	O
and	O
the	O
end	O
of	O
the	O
base	O
game	O
,	O
though	O
the	O
expansion	O
's	O
events	O
do	O
not	O
cross	O
the	O
main	O
story	O
in	O
any	O
way	O
.	O
</s>
<s>
Rockstar	O
found	O
a	O
match	O
in	O
the	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
universe	O
for	O
their	O
long-standing	O
aim	O
to	O
create	O
a	O
zombie	B-Application
game	O
.	O
</s>
<s>
In	O
lieu	O
of	O
making	O
a	O
new	O
intellectual	O
property	O
for	O
such	O
a	O
game	O
,	O
Rockstar	O
instead	O
wanted	O
players	O
to	O
see	O
how	O
a	O
zombie	B-Application
outbreak	O
affected	O
a	O
world	O
already	O
familiar	O
to	O
them	O
.	O
</s>
<s>
The	O
company	O
thought	O
that	O
this	O
would	O
make	O
the	O
zombie	B-Application
trope	O
more	O
interesting	O
.	O
</s>
<s>
Rockstar	O
also	O
saw	O
similar	O
"	O
cinematic	O
heritage	O
"	O
between	O
the	O
Western	O
and	O
zombie	B-Application
horror	O
genres	O
.	O
</s>
<s>
The	O
team	O
used	O
the	O
analogy	O
of	O
a	O
1970s	O
film	O
set	O
to	O
explain	O
their	O
ambitionsthat	O
Undead	B-Application
Nightmare	I-Application
in	O
the	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
universe	O
would	O
feel	O
like	O
its	O
characters	O
filming	O
a	O
"	O
serious	O
,	O
revisionist	O
Western	O
"	O
by	O
day	O
and	O
a	O
"	O
somewhat	O
insane	O
horror	O
movie	O
"	O
with	O
the	O
same	O
cast	O
and	O
set	O
by	O
night	O
.	O
</s>
<s>
Following	O
its	O
experience	O
with	O
Grand	B-Application
Theft	I-Application
Auto	I-Application
IV	I-Application
downloadable	B-Protocol
content	I-Protocol
packs	O
,	O
Rockstar	O
wanted	O
its	O
add-on	O
packs	O
to	O
be	O
a	O
separate	O
story	O
with	O
possible	O
overlaps	O
rather	O
than	O
a	O
continuation	O
of	O
the	O
main	O
story	O
.	O
</s>
<s>
Rockstar	O
vice	O
president	O
of	O
creative	O
Dan	O
Houser	O
described	O
several	O
reasons	O
for	O
not	O
using	O
the	O
Grand	B-Application
Theft	I-Application
Auto	I-Application
universe	O
for	O
the	O
zombie	B-Application
release	O
:	O
(	O
1	O
)	O
that	O
Red	O
Dead	O
shooting	O
mechanics	O
,	O
including	O
its	O
slow-motion	O
Dead	O
Eye	O
feature	O
,	O
were	O
a	O
better	O
fit	O
for	O
zombie	B-Application
headshots	O
,	O
(	O
2	O
)	O
that	O
zombies	B-Application
were	O
a	O
better	O
fit	O
for	O
the	O
Great	O
Plains	O
landscape	O
,	O
more	O
reminiscent	O
of	O
a	O
1970s	O
horror	O
film	O
,	O
and	O
(	O
3	O
)	O
that	O
John	O
's	O
character	O
was	O
a	O
better	O
fit	O
for	O
hunting	O
zombies	B-Application
than	O
the	O
protagonists	O
of	O
Grand	B-Application
Theft	I-Application
Auto	I-Application
games	I-Application
.	O
</s>
<s>
Houser	O
said	O
that	O
reviews	O
of	O
the	O
base	O
game	O
had	O
little	O
impact	O
on	O
the	O
development	O
of	O
Undead	B-Application
Nightmare	I-Application
,	O
though	O
the	O
team	O
used	O
the	O
smaller	O
downloadable	B-Protocol
content	I-Protocol
packs	O
and	O
patches	O
to	O
add	O
features	O
that	O
others	O
wanted	O
in	O
the	O
main	O
game	O
.	O
</s>
<s>
Hip	O
hop	O
musician	O
Oh	O
No	O
made	O
drum	O
tracks	O
for	O
the	O
expansion	O
as	O
preparation	O
for	O
his	O
work	O
on	O
Grand	B-Application
Theft	I-Application
Auto	I-Application
V	I-Application
.	O
Rockstar	O
released	O
Undead	B-Application
Nightmare	I-Application
on	O
October	O
26	O
,	O
2010	O
.	O
</s>
<s>
Rockstar	O
's	O
Dan	O
Houser	O
said	O
that	O
the	O
team	O
was	O
satisfied	O
with	O
their	O
results	O
and	O
how	O
the	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
world	O
and	O
zombie	B-Application
theme	O
supplemented	O
each	O
other	O
's	O
context	O
and	O
depth	O
.	O
</s>
<s>
A	O
standalone	O
retail	O
disc	O
release	O
of	O
Undead	B-Application
Nightmare	I-Application
followed	O
in	O
late	O
November	O
2010	O
.	O
</s>
<s>
The	O
release	O
compiles	O
the	O
Undead	B-Application
Nightmare	I-Application
campaign	O
with	O
two	O
smaller	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
download	O
packs	O
:	O
"	O
Legends	O
and	O
Killers	O
"	O
and	O
"	O
Liars	O
and	O
Cheats	O
"	O
.	O
</s>
<s>
Since	O
the	O
base	O
game	O
and	O
its	O
expansion	O
share	O
the	O
same	O
multiplayer	O
,	O
Official	O
Xbox	B-Device
Magazine	O
described	O
the	O
standalone	O
Undead	B-Application
Nightmare	I-Application
as	O
the	O
same	O
as	O
the	O
original	O
game	O
save	O
for	O
having	O
swapped	O
its	O
single-player	O
campaign	O
for	O
a	O
new	O
one	O
.	O
</s>
<s>
Undead	B-Application
Nightmare	I-Application
received	O
"	O
generally	O
favorable	O
"	O
reviews	O
,	O
according	O
to	O
review	B-Application
aggregator	I-Application
website	O
Metacritic	O
,	O
and	O
was	O
named	O
among	O
the	O
best	O
downloadable	B-Protocol
content	I-Protocol
of	O
the	O
year	O
.	O
</s>
<s>
It	O
won	O
the	O
award	O
for	O
best	O
downloadable	B-Protocol
content	I-Protocol
of	O
the	O
year	O
at	O
the	O
2010	O
Spike	O
Video	O
Game	O
Awards	O
,	O
and	O
at	O
Shacknews	O
over	O
other	O
notable	O
packs	O
like	O
Lair	B-Application
of	I-Application
the	I-Application
Shadow	I-Application
Broker	I-Application
(	O
Mass	B-Application
Effect	I-Application
2	I-Application
and	O
Minerva	B-Application
's	I-Application
Den	I-Application
(	O
BioShock	B-Application
2	I-Application
.	O
</s>
<s>
Dan	O
Whitehead	O
from	O
Eurogamer	O
credited	O
Undead	B-Application
Nightmare	I-Application
nuanced	O
treatment	O
of	O
John	O
Marston	O
as	O
proof	O
of	O
him	O
being	O
"	O
one	O
of	O
gaming	O
's	O
great	O
characters	O
"	O
.	O
</s>
<s>
As	O
a	O
continuation	O
,	O
"	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
elegiac	O
tone	O
knits	O
incredibly	O
well	O
with	O
[	O
its	O
expansion's ]	O
arch	O
Gothic	O
horror	O
"	O
,	O
wrote	O
Whitehead	O
.	O
</s>
<s>
At	O
the	O
time	O
,	O
zombies	B-Application
were	O
a	O
recurring	O
motif	O
in	O
video	O
games	O
.	O
</s>
<s>
Reviewers	O
recommended	O
finishing	O
the	O
base	O
game	O
before	O
starting	O
the	O
downloadable	B-Protocol
content	I-Protocol
,	O
not	O
for	O
spoilers	O
but	O
to	O
make	O
the	O
most	O
of	O
the	O
game	O
's	O
references	O
to	O
the	O
original	O
story	O
.	O
</s>
<s>
The	O
reviewer	O
compared	O
the	O
game	O
's	O
reinvigoration	O
to	O
that	O
of	O
the	O
download	O
content	O
created	O
for	O
Rockstar	O
's	O
Grand	B-Application
Theft	I-Application
Auto	I-Application
IV	I-Application
.	O
</s>
<s>
Critics	O
noted	O
ways	O
in	O
which	O
Undead	B-Application
Nightmare	I-Application
borrowed	O
zombie	B-Application
designs	O
from	O
the	O
Left	O
4	O
Dead	O
series	O
.	O
</s>
<s>
Critics	O
reported	O
that	O
players	O
rarely	O
need	O
to	O
use	O
Undead	B-Application
Nightmare	I-Application
new	O
weapons	O
.	O
</s>
<s>
Whitehead	O
(	O
Eurogamer	O
)	O
said	O
that	O
Marston	O
's	O
firearms	O
are	O
mostly	O
indistinguishable	O
apart	O
from	O
the	O
blunderbuss	O
,	O
which	O
is	O
only	O
useful	O
when	O
the	O
player	O
is	O
overrun	O
by	O
zombies	B-Application
.	O
</s>
<s>
GameSpot	O
added	O
that	O
the	O
game	O
's	O
combat	O
is	O
repetitive	O
and	O
less	O
fun	O
in	O
the	O
expansion	O
,	O
as	O
zombies	B-Application
barely	O
pose	O
a	O
threat	O
.	O
</s>
<s>
The	O
zombies	B-Application
,	O
without	O
guns	O
,	O
cover	O
,	O
horses	O
,	O
lack	O
the	O
complexities	O
of	O
cowboys	O
and	O
,	O
apart	O
from	O
some	O
of	O
the	O
special	O
zombie	B-Application
types	O
,	O
are	O
only	O
a	O
threat	O
at	O
short	O
distances	O
.	O
</s>
<s>
Thus	O
the	O
player	O
is	O
forced	O
into	O
the	O
technique	O
of	O
backtracking	O
and	O
turning	O
to	O
use	O
the	O
time-slowing	O
Dead	O
Eye	O
mode	O
to	O
clear	O
zombies	B-Application
with	O
headshots	O
.	O
</s>
<s>
The	O
reviewer	O
also	O
found	O
the	O
controls	O
clumsy	O
and	O
often	O
tripped	O
on	O
piles	O
of	O
zombie	B-Application
bodies	O
or	O
became	O
stuck	O
in	O
doorways	O
.	O
</s>
<s>
While	O
the	O
idea	O
of	O
zombie	B-Application
animals	O
scared	O
Whitehead	O
,	O
he	O
was	O
both	O
relieved	O
and	O
disappointed	O
to	O
find	O
that	O
bears	O
and	O
cougars	O
,	O
like	O
the	O
humans	O
,	O
died	O
with	O
a	O
single	O
bullet	O
.	O
</s>
<s>
Eurogamer	O
noted	O
the	O
annoyance	O
of	O
returning	O
to	O
defend	O
over	O
20	O
towns	O
each	O
with	O
recurring	O
zombie	B-Application
problems	O
,	O
but	O
said	O
that	O
the	O
game	O
mechanic	O
is	O
never	O
too	O
bothersome	O
and	O
even	O
appreciated	O
its	O
element	O
of	O
time	O
management	O
,	O
similar	O
to	O
that	O
of	O
the	O
Dead	B-Application
Rising	I-Application
game	O
series	O
.	O
</s>
<s>
Reviewers	O
also	O
noted	O
technical	O
issues	O
with	O
moving	O
John	O
's	O
character	O
,	O
especially	O
when	O
climbing	O
ladders	O
and	O
outrunning	O
zombies	B-Application
.	O
</s>
<s>
Critics	O
praised	O
Undead	B-Application
Nightmare	I-Application
as	O
a	O
model	O
for	O
downloadable	B-Protocol
content	I-Protocol
especially	O
in	O
its	O
balance	O
of	O
content	O
and	O
price	O
.	O
</s>
<s>
Neil	O
Davey	O
(	O
The	O
Guardian	O
)	O
said	O
that	O
it	O
was	O
the	O
best	O
purchase	O
of	O
2010	O
at	O
its	O
price	O
range	O
,	O
but	O
staff	O
of	O
the	O
Official	O
Xbox	B-Device
Magazine	O
found	O
the	O
price	O
slightly	O
too	O
high	O
.	O
</s>
<s>
At	O
the	O
time	O
of	O
its	O
2010	O
release	O
,	O
the	O
Official	O
Xbox	B-Device
Magazine	O
counted	O
Undead	B-Application
Nightmare	I-Application
among	O
the	O
best	O
downloadable	B-Protocol
content	I-Protocol
in	O
existence	O
.	O
</s>
<s>
Undead	B-Application
Nightmare	I-Application
has	O
been	O
heralded	O
among	O
the	O
best	O
expansion	O
packs	O
ever	O
produced	O
for	O
a	O
video	O
game	O
.	O
</s>
<s>
Kotaku	O
wrote	O
of	O
its	O
originality	O
,	O
despite	O
the	O
trite	O
zombie	B-Application
theme	O
,	O
and	O
added	O
that	O
the	O
expansion	O
functioned	O
best	O
when	O
Rockstar	O
used	O
the	O
game	O
's	O
pretense	O
to	O
exercise	O
their	O
sense	O
of	O
humor	O
,	O
with	O
undead	O
versions	O
of	O
normal	O
animals	O
,	O
and	O
new	O
mythical	O
creatures	O
.	O
</s>
<s>
Undead	B-Application
Nightmare	I-Application
took	O
a	O
good	O
title	O
and	O
"	O
put	O
it	O
over	O
the	O
top	O
"	O
,	O
as	O
USgamer	O
put	O
it	O
.	O
</s>
<s>
Hardcore	O
Gamer	O
cited	O
the	O
expansion	O
as	O
an	O
example	O
of	O
downloadable	B-Protocol
content	I-Protocol
that	O
would	O
have	O
never	O
fit	O
in	O
the	O
main	O
game	O
but	O
instead	O
let	O
the	O
developers	O
explore	O
other	O
ideas	O
.	O
</s>
<s>
Microsoft	O
added	O
the	O
game	O
to	O
its	O
backwards	O
compatibility	O
list	O
for	O
Xbox	B-Device
One	I-Device
,	O
the	O
successor	O
to	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
,	O
in	O
July	O
2016	O
.	O
</s>
<s>
The	O
release	O
runs	O
at	O
a	O
smoother	O
frame	O
rate	O
on	O
the	B-Device
Xbox	I-Device
One	I-Device
.	O
</s>
<s>
In	O
April	O
2018	O
,	O
the	O
game	O
received	O
an	O
update	O
as	O
an	O
"	O
Xbox	B-Device
One	I-Device
X	I-Device
enhanced	I-Device
"	O
title	O
,	O
making	O
the	O
original	O
game	O
code	O
playable	O
at	O
4K	B-Architecture
resolution	I-Architecture
(	O
an	O
increase	O
from	O
the	O
game	O
's	O
original	O
720p	O
resolution	O
)	O
and	O
with	O
some	O
graphical	O
improvements	O
on	O
the	O
high-end	O
revision	O
of	O
Xbox	B-Device
One	I-Device
,	O
called	O
Xbox	B-Device
One	I-Device
X	O
.	O
</s>
<s>
The	O
Xbox	B-Device
Series	I-Device
X	I-Device
and	I-Device
Series	I-Device
S	I-Device
can	O
also	O
play	O
the	O
game	O
,	O
with	O
the	O
higher-end	O
Series	B-Device
X	I-Device
running	O
it	O
with	O
its	O
Xbox	B-Device
One	I-Device
X-specific	O
enhancements	O
.	O
</s>
<s>
Sony	O
added	O
Red	B-Application
Dead	I-Application
Redemption	I-Application
and	O
Undead	B-Application
Nightmare	I-Application
to	O
its	O
PlayStation	B-General_Concept
Now	I-General_Concept
cloud	O
gaming	O
subscription	O
service	O
in	O
December	O
2016	O
,	O
which	O
allowed	O
them	O
to	O
be	O
played	O
on	O
PlayStation	B-Operating_System
4	I-Operating_System
,	O
PlayStation	B-Device
5	I-Device
,	O
as	O
well	O
as	O
PCs	B-Device
running	O
Windows	O
;	O
they	O
were	O
removed	O
in	O
October	O
2022	O
.	O
</s>
