<s>
Firewall	B-Application
:	I-Application
Zero	I-Application
Hour	I-Application
is	O
a	O
virtual	B-Application
reality	I-Application
first-person	O
shooter	O
game	O
developed	O
by	O
First	O
Contact	O
Entertainment	O
and	O
published	O
by	O
Sony	O
Interactive	O
Entertainment	O
.	O
</s>
<s>
It	O
was	O
released	O
for	O
the	B-Operating_System
PlayStation	I-Operating_System
4	I-Operating_System
via	O
the	O
PlayStation	B-Device
VR	I-Device
on	O
August	O
28	O
,	O
2018	O
.	O
</s>
<s>
A	O
sequel	O
,	O
Firewall	O
Ultra	O
,	O
was	O
announced	O
in	O
September	O
2022	O
for	O
the	O
PlayStation	B-Device
VR2	I-Device
.	O
</s>
<s>
Firewall	B-Application
:	I-Application
Zero	I-Application
Hour	I-Application
is	O
an	O
online	O
,	O
or	O
offline	O
via	O
training	O
,	O
virtual	B-Application
reality	I-Application
tactical	O
action	O
shooter	O
where	O
players	O
called	O
contractors	O
take	O
on	O
contracts	O
issued	O
from	O
agents	O
who	O
are	O
known	O
as	O
mother	O
and	O
father	O
.	O
</s>
<s>
Players	O
can	O
practice	O
their	O
tactics	O
against	O
AI	B-Application
enemies	O
that	O
scale	O
with	O
rank	O
either	O
solo	O
,	O
or	O
in	O
a	O
4-player	O
squad	O
which	O
either	O
can	O
be	O
private	O
or	O
public	O
matchmaking	O
.	O
</s>
<s>
Initial	O
reviews	O
for	O
Firewall	B-Application
:	I-Application
Zero	I-Application
Hour	I-Application
were	O
positive	O
and	O
the	O
game	O
was	O
praised	O
as	O
being	O
a	O
major	O
step	O
forward	O
for	O
virtual	B-Application
reality	I-Application
gaming	O
.	O
</s>
