<s>
Ninja	B-Application
Gaiden	I-Application
Sigma	I-Application
2	I-Application
,	O
stylized	O
as	O
Ninja	B-Application
Gaiden	I-Application
Σ2	I-Application
,	O
is	O
a	O
port	O
of	O
the	O
2008	O
Xbox	B-Operating_System
360	I-Operating_System
video	O
game	O
Ninja	B-Application
Gaiden	I-Application
II	I-Application
,	O
and	O
was	O
developed	O
by	O
Team	O
Ninja	O
exclusively	O
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
in	O
2009	O
.	O
</s>
<s>
The	O
game	O
changes	O
Ninja	B-Application
Gaiden	I-Application
II	I-Application
in	O
a	O
similar	O
,	O
but	O
not	O
identical	O
way	O
to	O
how	O
Ninja	B-Application
Gaiden	I-Application
Sigma	O
changed	O
the	O
original	O
Ninja	B-Application
Gaiden	I-Application
.	O
</s>
<s>
A	O
port	O
for	O
the	O
PlayStation	B-Device
Vita	I-Device
,	O
titled	O
Ninja	B-Application
Gaiden	I-Application
Sigma	I-Application
2	I-Application
Plus	I-Application
(	O
Ninja	O
Gaiden	O
Σ2+	O
)	O
,	O
was	O
released	O
in	O
2013	O
.	O
</s>
<s>
Ninja	B-Application
Gaiden	I-Application
Sigma	I-Application
2	I-Application
was	O
released	O
for	O
the	O
Microsoft	B-Application
Windows	I-Application
,	O
Nintendo	B-Application
Switch	I-Application
,	O
PlayStation	B-Operating_System
4	I-Operating_System
,	O
and	O
Xbox	B-Device
One	I-Device
as	O
part	O
of	O
the	O
Ninja	B-Application
Gaiden	I-Application
:	O
Master	O
Collection	O
on	O
June	O
10	O
,	O
2021	O
.	O
</s>
<s>
In	O
comparison	O
to	O
the	O
original	O
version	O
of	O
Ninja	B-Application
Gaiden	I-Application
II	I-Application
,	O
the	O
game	O
features	O
new	O
large-scale	O
bosses	O
,	O
an	O
online	O
co-operative	O
gameplay	O
mode	O
with	O
three	O
new	O
playable	O
characters	O
(	O
Ayane	O
,	O
Momiji	O
,	O
Rachel	O
)	O
and	O
the	O
PlayStation	B-Device
Network	I-Device
Trophy	O
support	O
.	O
</s>
<s>
Unlike	O
the	O
first	O
game	O
,	O
the	O
Sixaxis	B-Device
motion	O
sensing	O
of	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
controller	O
was	O
not	O
used	O
for	O
"	O
charging	O
"	O
the	O
Ninpo	O
magic	O
,	O
but	O
instead	O
utilized	O
as	O
a	O
secret	O
way	O
to	O
jiggle	O
the	O
breasts	O
of	O
female	O
characters	O
.	O
</s>
<s>
While	O
Sigma	O
2	O
has	O
additional	O
content	O
not	O
in	O
the	O
original	O
Ninja	B-Application
Gaiden	I-Application
II	I-Application
,	O
a	O
large	O
amount	O
of	O
content	O
was	O
also	O
removed	O
from	O
the	O
game	O
,	O
or	O
altered	O
,	O
such	O
as	O
a	O
drastically	O
reduced	O
enemy	O
count	O
within	O
gameplay	O
.	O
</s>
<s>
Projectile	O
spam	O
was	O
greatly	O
reduced	O
from	O
NGII	B-Application
.	O
</s>
<s>
There	O
is	O
one	O
new	O
boss	O
for	O
each	O
alternate	O
character	O
's	O
chapter	O
(	O
including	O
returning	O
bosses	O
from	O
Ninja	B-Application
Gaiden	I-Application
:	I-Application
Dragon	I-Application
Sword	I-Application
and	O
the	O
2004	O
Ninja	B-Application
Gaiden	I-Application
)	O
,	O
a	O
Dragon	O
to	O
replace	O
the	O
double	O
Quetzalcoatl	O
fight	O
(	O
though	O
Quetzalcoatl	O
can	O
still	O
be	O
fought	O
alone	O
as	O
in	O
Ninja	B-Application
Gaiden	I-Application
II	I-Application
)	O
,	O
and	O
two	O
giant	O
statues	O
:	O
a	O
giant	O
Buddha	O
Statue	O
and	O
a	O
Statue	O
of	O
Liberty	O
animated	O
by	O
Alexei	O
.	O
</s>
<s>
Finally	O
,	O
almost	O
all	O
the	O
gore	O
has	O
been	O
removed	O
in	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
version	O
.	O
</s>
<s>
In	O
the	O
Japanese	O
version	O
of	O
Sigma	O
2	O
the	O
player	O
can	O
only	O
decapitate	O
monsters	O
and	O
non-humans	O
;	O
even	O
the	O
pause	O
menu	O
and	O
game	B-Application
over	I-Application
screens	O
are	O
colored	O
blue	O
instead	O
of	O
red	O
to	O
reflect	O
this	O
change	O
.	O
</s>
<s>
The	O
Sigma	O
2	O
Plus	O
version	O
for	O
the	O
PlayStation	B-Device
Vita	I-Device
,	O
however	O
.	O
</s>
<s>
The	O
game	O
's	O
plot	O
is	O
based	O
on	O
that	O
in	O
Ninja	B-Application
Gaiden	I-Application
II	I-Application
.	O
</s>
<s>
Exclusive	O
to	O
the	O
Sigma	O
version	O
of	O
the	O
game	O
are	O
three	O
new	O
chapters	O
starring	O
three	O
alternate	O
playable	O
characters	O
:	O
Ayane	O
(	O
a	O
kunoichi	B-Application
from	O
the	O
Mugen	O
Tenshin	O
ninja	O
clan	O
,	O
a	O
friendly	O
clan	O
who	O
helps	O
Ryu	O
,	O
originally	O
from	O
the	O
Dead	B-Application
or	I-Application
Alive	I-Application
series	O
)	O
,	O
Momiji	O
(	O
a	O
female	O
member	O
of	O
the	O
Hayabusa	O
clan	O
who	O
uses	O
a	O
naginata	O
and	O
was	O
introduced	O
in	O
Ninja	B-Application
Gaiden	I-Application
:	I-Application
Dragon	I-Application
Sword	I-Application
)	O
and	O
Rachel	O
(	O
a	O
Fiend	O
hunter	O
from	O
the	O
Holy	O
Vigoor	B-Application
Empire	I-Application
who	O
is	O
in	O
possession	O
of	O
the	O
"	O
Fiend	O
's	O
Blood	O
"	O
curse	O
and	O
first	O
appeared	O
in	O
the	O
2004	O
's	O
Ninja	B-Application
Gaiden	I-Application
)	O
.	O
</s>
<s>
Though	O
Team	O
Ninja	O
developed	O
the	O
title	O
,	O
the	O
series	O
 '	O
creator	O
Tomonobu	O
Itagaki	O
did	O
not	O
design	O
it	O
,	O
as	O
he	O
left	O
Team	O
Ninja	O
after	O
completing	O
Ninja	B-Application
Gaiden	I-Application
II	I-Application
.	O
</s>
<s>
Yosuke	O
Hayashi	O
,	O
director	O
of	O
Ninja	B-Application
Gaiden	I-Application
Sigma	O
,	O
produced	O
and	O
directed	O
NGS2	O
.	O
</s>
<s>
Hayashi	O
as	O
the	O
new	O
director	O
of	O
Team	O
Ninja	O
had	O
the	O
game	O
ported	O
from	O
its	O
original	O
Xbox	B-Operating_System
360	I-Operating_System
engine	O
to	O
the	O
engine	O
used	O
to	O
create	O
Ninja	B-Application
Gaiden	I-Application
Sigma	O
.	O
</s>
<s>
The	O
game	O
's	O
native	O
resolution	O
became	O
720p	O
,	O
compared	O
to	O
the	O
original	O
585p	O
in	O
the	O
original	O
Xbox	B-Operating_System
360	I-Operating_System
version	O
,	O
with	O
an	O
increased	O
use	O
of	O
bloom	O
lighting	O
effect	O
.	O
</s>
<s>
As	O
a	O
trade	O
off	O
for	O
increased	O
resolution	O
,	O
the	O
amount	O
of	O
on-screen	O
action	O
has	O
been	O
reduced	O
in	O
the	B-Operating_System
PS3	I-Operating_System
version	O
to	O
keep	O
the	O
game	O
running	O
at	O
an	O
acceptable	O
speed	O
.	O
</s>
<s>
Eurogamer	O
pointed	O
out	O
that	O
there	O
are	O
fewer	O
enemies	O
spawned	O
at	O
one	O
time	O
in	O
the	B-Operating_System
PS3	I-Operating_System
version	O
of	O
the	O
game	O
,	O
and	O
the	O
developers	O
"	O
blatantly	O
remove	O
polygons	O
in	O
the	O
Sigma	O
edition	O
in	O
order	O
to	O
maintain	O
frame-rate.	O
"	O
</s>
<s>
Also	O
of	O
note	O
is	O
the	O
reduction	O
of	O
bloodshed	O
and	O
gore-related	O
violence	O
than	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
.	O
</s>
<s>
Those	O
who	O
purchased	O
the	O
Collector	O
's	O
Edition	O
of	O
Ninja	B-Application
Gaiden	I-Application
Sigma	I-Application
2	I-Application
were	O
treated	O
to	O
a	O
comic	O
version	O
of	O
the	O
prologue	O
,	O
titled	O
The	O
Vampire	O
War	O
,	O
and	O
the	O
original	O
soundtrack	O
.	O
</s>
<s>
Ninja	B-Application
Gaiden	I-Application
Σ	O
2	O
has	O
an	O
overall	O
Metacritic	O
rating	O
of	O
83/100	O
.	O
</s>
