<s>
is	O
a	O
video	O
game	O
developed	O
by	O
Aquria	O
and	O
published	O
by	O
Bandai	O
Namco	O
Entertainment	O
for	O
the	B-Operating_System
PlayStation	I-Operating_System
4	I-Operating_System
,	O
PlayStation	B-Device
Vita	I-Device
,	O
and	O
Windows	B-Application
PC	I-Application
,	O
based	O
on	O
the	O
Japanese	O
light	O
novel	O
series	O
,	O
Sword	B-Application
Art	I-Application
Online	I-Application
.	O
</s>
<s>
It	O
is	O
the	O
fourth	O
video	O
game	O
in	O
the	O
series	O
and	O
the	O
successor	O
to	O
Sword	B-Application
Art	I-Application
Online	I-Application
:	I-Application
Lost	I-Application
Song	I-Application
.	O
</s>
<s>
Hollow	B-Application
Realization	I-Application
was	O
released	O
on	O
October	O
27	O
,	O
2016	O
,	O
in	O
Japan	O
,	O
and	O
on	O
November	O
8	O
,	O
2016	O
,	O
for	O
North	O
American	O
and	O
European	O
territories	O
.	O
</s>
<s>
A	O
Nintendo	B-Application
Switch	I-Application
version	O
of	O
the	O
game	O
was	O
released	O
on	O
April	O
25	O
,	O
2019	O
,	O
in	O
Japan	O
,	O
and	O
worldwide	O
on	O
May	O
24	O
,	O
2019	O
.	O
</s>
<s>
Unlike	O
in	O
Sword	B-Application
Art	I-Application
Online	I-Application
:	I-Application
Hollow	I-Application
Fragment	I-Application
and	O
Lost	B-Application
Song	I-Application
,	O
a	O
party	O
in	O
Hollow	B-Application
Realization	I-Application
consists	O
of	O
four	O
characters	O
including	O
the	O
player	O
,	O
instead	O
of	O
three	O
.	O
</s>
<s>
While	O
HF	O
is	O
played	O
like	O
a	O
role-playing	O
game	O
and	O
LS	O
like	O
an	O
action	B-Application
role-playing	I-Application
game	I-Application
,	O
HR	O
is	O
based	O
on	O
HF	O
style	O
,	O
but	O
with	O
action	O
elements	O
integrated	O
.	O
</s>
<s>
A	O
new	O
battle	O
system	O
also	O
features	O
in	O
Hollow	B-Application
Realization	I-Application
,	O
where	O
the	O
four-person	O
team	O
of	O
players	O
fight	O
monsters	O
using	O
sword	O
skills	O
in	O
a	O
similar	O
fashion	O
to	O
the	O
original	O
Sword	B-Application
Art	I-Application
Online	I-Application
game	O
.	O
</s>
<s>
Set	O
in	O
a	O
"	O
wider	O
world	O
"	O
,	O
Hollow	B-Application
Realization	I-Application
features	O
monsters	O
new	O
to	O
the	O
series	O
.	O
</s>
<s>
Hollow	B-Application
Realization	I-Application
is	O
approximately	O
30	O
to	O
40	O
hours	O
in	O
length	O
;	O
however	O
,	O
completely	O
finishing	O
the	O
game	O
such	O
as	O
leveling	O
up	O
to	O
the	O
highest	O
level	O
and	O
completing	O
all	O
the	O
quests	O
will	O
take	O
the	O
player	O
approximately	O
70	O
to	O
100	O
hours	O
.	O
</s>
<s>
The	O
game	O
has	O
downloadable	B-Protocol
content	I-Protocol
,	O
including	O
the	O
free	O
expansion	O
pack	O
Fighters	O
of	O
the	O
Blue	O
Sky	O
,	O
featuring	O
Sword	B-Application
Art	I-Application
Online	I-Application
:	I-Application
Lost	I-Application
Song	I-Application
characters	O
Rain	O
and	O
Seven	O
,	O
a	O
new	O
PvP	O
feature	O
,	O
and	O
an	O
additional	O
story	O
.	O
</s>
<s>
Hollow	B-Application
Realization	I-Application
takes	O
place	O
in	O
Sword	O
Art	O
:	O
Origin	O
,	O
a	O
restoration	O
of	O
Aincrad	O
titled	O
Ainground	O
,	O
with	O
intentions	O
of	O
research	O
and	O
development	O
in	O
the	O
year	O
2026	O
,	O
three	O
years	O
after	O
the	O
original	O
Sword	B-Application
Art	I-Application
Online	I-Application
event	O
.	O
</s>
<s>
However	O
,	O
unlike	O
in	O
Sword	B-Application
Art	I-Application
Online	I-Application
,	O
Ainground	O
is	O
one	O
large	O
floor	O
,	O
instead	O
of	O
multiple	O
,	O
while	O
the	O
castle	O
itself	O
was	O
renamed	O
to	O
Aincrad	O
,	O
where	O
several	O
monsters	O
can	O
be	O
battled	O
.	O
</s>
<s>
The	O
main	O
character	O
of	O
the	O
game	O
is	O
a	O
14-year	O
old	O
AI	B-Application
,	O
known	O
as	O
Premiere	O
,	O
that	O
travels	O
with	O
Kirito	O
.	O
</s>
<s>
Although	O
she	O
is	O
part	O
of	O
the	O
game	O
's	O
initial	O
release	O
,	O
a	O
later	O
patch	O
would	O
tweak	O
her	O
"	O
vocabulary	O
and	O
personality	O
"	O
in-game	O
to	O
a	O
"	O
specific	O
character	O
"	O
,	O
based	O
on	O
keywords	O
in	O
Twitter	B-Application
tweets	O
as	O
part	O
of	O
a	O
promotional	O
campaign	O
featuring	O
the	O
character	O
.	O
</s>
<s>
These	O
conversations	O
with	O
Twitter	B-Application
users	O
would	O
dictate	O
her	O
personality	O
over	O
time	O
and	O
ultimately	O
decide	O
if	O
she	O
would	O
become	O
a	O
"	O
good	O
girl	O
"	O
or	O
"	O
bad	O
girl	O
"	O
in-game	O
.	O
</s>
<s>
A	O
Western	O
release	O
date	O
was	O
later	O
announced	O
,	O
with	O
Hollow	B-Application
Realization	I-Application
releasing	O
in	O
Japan	O
on	O
October	O
27	O
and	O
internationally	O
on	O
November	O
8	O
.	O
</s>
<s>
Players	O
who	O
pre-ordered	O
Sword	B-Application
Art	I-Application
Online	I-Application
:	I-Application
Hollow	I-Application
Realization	I-Application
via	O
the	O
PlayStation	O
Store	O
in	O
Japan	O
gain	O
a	O
one-week	O
early	O
access	O
into	O
part	O
of	O
the	O
game	O
's	O
main	O
story	O
.	O
</s>
<s>
An	O
advertising	O
campaign	O
for	O
the	O
game	O
,	O
titled	O
"	O
Sword	O
Art	O
On-Nyaine	O
"	O
,	O
featured	O
cats	O
playing	O
with	O
toys	O
but	O
with	O
Hollow	B-Application
Realization	I-Application
sounds	O
dubbed	O
over	O
them	O
.	O
</s>
<s>
A	O
DLC	B-Protocol
called	O
Chapter	O
1	O
:	O
Explorer	O
of	O
Illusory	O
Mists	O
became	O
available	O
starting	O
on	O
May	O
16	O
,	O
2017	O
.	O
</s>
<s>
The	O
last	O
post-release	B-Protocol
content	I-Protocol
was	O
released	O
on	O
September	O
26	O
,	O
2017	O
,	O
closing	O
the	O
Abyss	O
of	O
the	O
Shrine	O
Maiden	O
saga	O
and	O
it	O
was	O
titled	O
Chapter	O
III	O
:	O
The	O
One	O
Who	O
Opposes	O
God	O
released	O
on	O
September	O
26	O
,	O
2017	O
.	O
</s>
<s>
Sword	B-Application
Art	I-Application
Online	I-Application
:	I-Application
Hollow	I-Application
Realization	I-Application
received	O
"	O
mixed	O
or	O
average	O
"	O
reviews	O
,	O
according	O
to	O
video	O
game	O
review	B-Application
aggregator	I-Application
Metacritic	O
.	O
</s>
<s>
Both	O
PlayStation	B-Operating_System
4	I-Operating_System
and	O
Vita	O
versions	O
received	O
final	O
scores	O
of	O
32/40	O
by	O
Famitsu	O
,	O
being	O
awarded	O
9	O
,	O
8	O
,	O
7	O
and	O
8	O
by	O
four	O
individual	O
reviewers	O
.	O
</s>
