<s>
Killzone	B-Application
:	I-Application
Liberation	I-Application
is	O
a	O
run	O
and	O
gun	O
video	O
game	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
,	O
developed	O
by	O
Guerrilla	O
Games	O
,	O
and	O
is	O
the	O
sequel	O
to	O
Killzone	B-Application
.	O
</s>
<s>
Killzone	B-Application
:	I-Application
Liberation	I-Application
was	O
released	O
on	O
October	O
31	O
,	O
2006	O
,	O
in	O
North	O
America	O
,	O
November	O
3	O
,	O
2006	O
,	O
in	O
Europe	O
and	O
November	O
8	O
,	O
2006	O
,	O
in	O
Australia	O
.	O
</s>
<s>
Killzone	B-Application
:	I-Application
Liberation	I-Application
is	O
the	O
only	O
PSP	B-Operating_System
installment	O
in	O
the	O
series	O
,	O
and	O
was	O
followed	O
by	O
Killzone	B-Application
:	I-Application
Mercenary	I-Application
on	O
the	O
PlayStation	B-Device
Vita	I-Device
.	O
</s>
<s>
In	O
Killzone	B-Application
:	I-Application
Liberation	I-Application
,	O
players	O
control	O
Templar	O
,	O
a	O
soldier	O
in	O
the	O
ISA	O
(	O
Interplanetary	O
Strategic	O
Alliance	O
)	O
as	O
he	O
battles	O
against	O
the	O
Helghast	B-Application
,	O
a	O
group	O
of	O
genetically	O
enhanced	O
soldiers	O
.	O
</s>
<s>
The	O
game	O
features	O
a	O
single-player	O
campaign	O
that	O
follows	O
Templar	O
as	O
he	O
tries	O
to	O
rescue	O
hostages	O
and	O
gather	O
intelligence	O
on	O
the	O
Helghast	B-Application
.	O
</s>
<s>
Killzone	B-Application
:	I-Application
Liberation	I-Application
is	O
known	O
for	O
its	O
strong	O
graphics	O
and	O
gameplay	O
,	O
which	O
build	O
upon	O
the	O
foundations	O
of	O
the	O
original	O
Killzone	B-Application
game	O
.	O
</s>
<s>
This	O
game	O
features	O
a	O
top-down	O
isometric	B-Application
view	O
in	O
contrast	O
to	O
the	O
original	O
Killzone	B-Application
for	O
the	O
PlayStation	O
2	O
,	O
which	O
is	O
a	O
first-person	O
shooter	O
.	O
</s>
<s>
Players	O
can	O
choose	O
a	O
team	O
(	O
between	O
ISA	O
and	O
Helghast	B-Application
)	O
and	O
also	O
choose	O
a	O
character	O
in	O
the	O
multiplayer	O
menu	O
.	O
</s>
<s>
There	O
are	O
a	O
variety	O
of	O
game	O
modes	O
,	O
including	O
Deathmatch	O
(	O
where	O
player	O
kill	O
one	O
another	O
regardless	O
of	O
team	O
)	O
,	O
Team	O
Deathmatch	O
(	O
where	O
teams	O
kill	O
one	O
another	O
)	O
,	O
Deathmatch	O
Duel	O
(	O
where	O
a	O
slightly	O
smaller	O
portion	O
of	O
the	O
map	O
is	O
cut	O
off	O
by	O
barbed	O
wire	O
so	O
players	O
have	O
a	O
smaller	O
area	O
to	O
maneuver	O
in	O
)	O
,	O
Capture	B-Application
the	I-Application
Flag	I-Application
(	O
where	O
teams	O
try	O
to	O
get	O
the	O
enemy	O
flag	O
and	O
bring	O
it	O
back	O
to	O
their	O
flag	O
)	O
and	O
Assault	O
(	O
where	O
the	O
Helghast	B-Application
team	O
has	O
to	O
plant	O
3	O
charges	O
of	O
C4	O
around	O
an	O
ISA	O
beacon	O
and	O
the	O
ISA	O
have	O
to	O
try	O
and	O
stop	O
them	O
)	O
.	O
</s>
<s>
Infrastructure	O
was	O
only	O
made	O
available	O
for	O
download	O
as	O
DLC	B-Protocol
,	O
and	O
is	O
not	O
initially	O
available	O
for	O
"	O
out	O
of	O
the	O
box	O
play.	O
"	O
</s>
<s>
There	O
are	O
five	O
chapters	O
with	O
4	O
levels	O
in	O
which	O
players	O
eliminate	O
the	O
Helghast	B-Application
resistance	O
(	O
the	O
fifth	O
and	O
final	O
chapter	O
was	O
made	O
available	O
to	O
download	O
)	O
.	O
</s>
<s>
In	O
Killzone	B-Application
:	I-Application
Liberation	I-Application
,	O
two	O
months	O
after	O
the	O
events	O
of	O
Killzone	B-Application
,	O
the	O
Helghast	B-Application
have	O
been	O
dealt	O
a	O
hefty	O
blow	O
from	O
the	O
last	O
game	O
,	O
but	O
the	O
war	O
is	O
far	O
from	O
over	O
.	O
</s>
<s>
The	O
enemy	O
still	O
controls	O
large	O
parts	O
of	O
the	O
planet	O
Vekta	B-Application
,	O
and	O
though	O
the	O
ISA	O
armies	O
are	O
fighting	O
hard	O
,	O
they	O
are	O
losing	O
ground	O
.	O
</s>
<s>
The	O
rules	O
of	O
war	O
have	O
been	O
cast	O
aside	O
with	O
the	O
sadistic	O
Helghast	B-Application
General	O
Armin	O
Metrac	O
,	O
employed	O
by	O
the	O
Helghast	B-Application
Emperor	O
Scolar	O
Visari	O
to	O
use	O
brutal	O
measures	O
in	O
order	O
to	O
seize	O
the	O
initiative	O
after	O
their	O
past	O
defeat	O
and	O
strengthen	O
his	O
position	O
further	O
.	O
</s>
<s>
Cobar	O
reveals	O
that	O
there	O
is	O
a	O
traitor	O
in	O
ISA	O
command	O
who	O
is	O
helping	O
the	O
Helghast	B-Application
,	O
but	O
is	O
finished	O
off	O
by	O
Stratson	O
before	O
he	O
can	O
say	O
who	O
the	O
traitor	O
is	O
.	O
</s>
<s>
There	O
,	O
he	O
fights	O
many	O
of	O
Helghan	B-Application
's	O
elite	O
warriors	O
(	O
including	O
a	O
giant	O
cybernetic	O
unit	O
)	O
before	O
encountering	O
and	O
killing	O
Metrac	O
in	O
a	O
final	O
showdown	O
.	O
</s>
<s>
The	O
game	O
's	O
outro	O
marks	O
the	O
beginning	O
of	O
Killzone	B-Application
2	I-Application
,	O
as	O
we	O
hear	O
Visari	O
speaking	O
of	O
nuclear	O
weapons	O
which	O
he	O
intends	O
to	O
use	O
on	O
ISA	O
forces	O
.	O
</s>
<s>
ISA	O
believes	O
that	O
the	O
unknown	O
traitor	O
is	O
supplying	O
Helghan	B-Application
with	O
information	O
.	O
</s>
<s>
Battling	O
his	O
way	O
through	O
the	O
war-ravaged	O
city	O
,	O
Jan	O
finally	O
finds	O
Rico	O
,	O
who	O
reveals	O
that	O
the	O
traitor	O
is	O
,	O
in	O
fact	O
,	O
Stratson	O
,	O
who	O
not	O
only	O
sold	O
the	O
planet	O
to	O
Helghast	B-Application
,	O
but	O
has	O
become	O
the	O
shadow	O
commander	O
of	O
the	O
remaining	O
Helghan	B-Application
forces	O
.	O
</s>
<s>
Jan	O
proceeds	O
to	O
the	O
Royal	O
Palace	O
of	O
Vekta	B-Application
,	O
where	O
Stratson	O
is	O
located	O
,	O
battling	O
hordes	O
of	O
Helghast	B-Application
and	O
even	O
Stratson	O
's	O
personal	O
elite	O
guard	O
on	O
his	O
way	O
.	O
</s>
<s>
The	O
game	O
was	O
originally	O
intended	O
to	O
have	O
downloadable	B-Protocol
content	I-Protocol
(	O
DLC	B-Protocol
)	O
on	O
its	O
release	O
day	O
,	O
but	O
due	O
to	O
technical	O
difficulties	O
,	O
the	O
downloads	O
promised	O
were	O
initially	O
undelivered	O
.	O
</s>
<s>
As	O
of	O
2011	O
,	O
the	O
two	O
DLC	B-Protocol
files	O
were	O
no	O
longer	O
available	O
from	O
the	O
Killzone	B-Application
website	O
.	O
</s>
<s>
In	O
June	O
2011	O
,	O
because	O
of	O
the	O
"	O
Welcome	O
Back	O
"	O
operation	O
,	O
Guerrilla	O
republished	O
the	O
DLC	B-Protocol
for	O
the	O
US	O
and	O
EU	O
version	O
.	O
</s>
<s>
The	O
game	O
received	O
"	O
generally	O
favorable	O
reviews	O
"	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
<s>
The	O
Sydney	O
Morning	O
Herald	O
gave	O
it	O
a	O
similar	O
score	O
of	O
four	O
stars	O
out	O
of	O
five	O
and	O
called	O
it	O
"	O
A	O
smart	O
and	O
challenging	O
blend	O
of	O
action	O
and	O
strategy	O
that	O
is	O
a	O
welcome	O
addition	O
to	O
the	O
PSP	B-Operating_System
's	O
growing	O
arsenal	O
of	O
titles.	O
"	O
</s>
<s>
The	O
game	O
also	O
received	O
IGN	O
's	O
award	O
for	O
Best	O
PSP	B-Operating_System
Offline	O
Multiplayer	O
Game	O
of	O
2006	O
.	O
</s>
<s>
In	O
2018	O
GamesRadar+	O
ranked	O
it	O
the	O
24th	O
best	O
PSP	B-Operating_System
game	O
of	O
all	O
time	O
.	O
</s>
