<s>
Code_18	O
is	O
a	O
visual	O
novel	O
video	O
game	O
developed	O
by	O
Cyberfront	O
and	O
released	O
on	O
September	O
29	O
,	O
2011	O
,	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
,	O
and	O
later	O
for	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
It	O
is	O
a	O
reboot	O
of	O
the	O
Infinity	B-Application
series	O
,	O
which	O
also	O
includes	O
Never	B-Application
7	I-Application
:	I-Application
The	I-Application
End	I-Application
of	I-Application
Infinity	I-Application
,	O
Ever	B-Application
17	I-Application
:	I-Application
The	I-Application
Out	I-Application
of	I-Application
Infinity	I-Application
,	O
Remember	B-Application
11	I-Application
:	I-Application
The	I-Application
Age	I-Application
of	I-Application
Infinity	I-Application
,	O
and	O
the	O
spin-off	O
12Riven	B-Application
:	I-Application
The	I-Application
Psi-Climinal	I-Application
of	I-Application
Integral	I-Application
.	O
</s>
<s>
Cyberfront	O
bought	O
the	O
rights	O
to	O
the	O
Infinity	B-Application
series	O
after	O
its	O
previous	O
developer	O
,	O
KID	O
,	O
closed	O
down	O
.	O
</s>
<s>
While	O
the	O
development	O
team	O
had	O
originally	O
planned	O
to	O
use	O
a	O
theme	O
of	O
"	O
escape	O
from	O
an	O
enclosed	O
space	O
"	O
similarly	O
to	O
previous	O
Infinity	B-Application
games	O
,	O
it	O
was	O
changed	O
due	O
to	O
concerns	O
of	O
the	O
size	O
of	O
the	O
game	O
's	O
audience	O
,	O
and	O
was	O
seen	O
as	O
a	O
reboot	O
of	O
the	O
series	O
.	O
</s>
<s>
Western	O
journalists	O
were	O
optimistic	O
,	O
while	O
Famitsu	O
360	B-Operating_System
gave	O
it	O
an	O
average	O
score	O
.	O
</s>
<s>
As	O
with	O
the	O
rest	O
of	O
the	O
Infinity	B-Application
series	O
,	O
Code_18	O
is	O
a	O
visual	O
novel	O
in	O
which	O
the	O
player	O
makes	O
progress	O
through	O
the	O
linear	O
story	O
by	O
talking	O
to	O
characters	O
and	O
listening	O
to	O
dialogue	O
.	O
</s>
<s>
Disposing	O
of	O
the	O
escape	O
scenarios	O
of	O
earlier	O
Infinity	B-Application
games	O
,	O
the	O
core	O
gameplay	O
features	O
the	O
player	O
character	O
Hayato	O
Hino	O
exploring	O
his	O
school	O
environment	O
and	O
interacting	O
with	O
five	O
female	O
characters	O
with	O
whom	O
he	O
can	O
develop	O
relationships	O
.	O
</s>
<s>
The	O
sender	O
of	O
the	O
voice	O
messages	O
from	O
the	O
future	O
is	O
revealed	O
to	O
be	O
the	O
Hayato	O
of	O
2040	O
;	O
as	O
the	O
future	O
versions	O
of	O
Hayato	O
and	O
Hikari	O
had	O
seen	O
Akari	O
in	O
2018	O
,	O
they	O
knew	O
that	O
they	O
needed	O
to	O
recreate	O
the	O
events	O
in	O
order	O
to	O
avoid	O
a	O
time	B-Application
paradox	I-Application
that	O
would	O
cause	O
Akari	O
to	O
cease	O
existing	O
.	O
</s>
<s>
After	O
KID	O
–	O
the	O
developer	O
of	O
previous	O
Infinity	B-Application
games	O
–	O
closed	O
down	O
,	O
Cyberfront	O
bought	O
the	O
rights	O
to	O
all	O
of	O
their	O
projects	O
.	O
</s>
<s>
Ken	O
Wakabayashi	O
,	O
who	O
worked	O
on	O
12Riven	B-Application
:	I-Application
The	I-Application
Psi-Climinal	I-Application
of	I-Application
Integral	I-Application
as	O
director	O
,	O
returned	O
for	O
Code_18	O
as	O
director	O
and	O
producer	O
,	O
in	O
addition	O
to	O
creating	O
the	O
basic	O
scenario	O
with	O
Chabou	O
Higurashi	O
.	O
</s>
<s>
The	O
writing	O
group	O
Run	O
&	O
Gun	O
,	O
mostly	O
known	O
for	O
working	O
on	O
otome	B-Application
games	I-Application
such	O
as	O
Skip	O
Beat	O
!,	O
wrote	O
the	O
game	O
's	O
scenario	O
,	O
while	O
the	O
character	O
design	O
was	O
done	O
by	O
comic	O
book	O
artist	O
Yutaka	O
Akatsu	O
.	O
</s>
<s>
The	O
game	O
was	O
seen	O
as	O
a	O
reboot	O
of	O
the	O
Infinity	B-Application
series	O
.	O
</s>
<s>
In	O
September	O
of	O
the	O
same	O
year	O
,	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
version	O
of	O
the	O
game	O
was	O
playable	O
at	O
Konami	O
's	O
booth	O
at	O
Tokyo	O
Game	O
Show	O
.	O
</s>
<s>
A	O
mobile	B-Application
game	I-Application
titled	O
Code_18	O
:	O
Another	O
Side	O
was	O
made	O
to	O
promote	O
Code_18	O
,	O
and	O
was	O
released	O
for	O
free	O
via	O
Mobage	O
on	O
June	O
8	O
,	O
2011	O
.	O
</s>
<s>
Code_18	O
was	O
published	O
by	O
Cyberfront	O
on	O
September	O
29	O
,	O
2011	O
,	O
for	O
PlayStation	B-Operating_System
Portable	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
in	O
Japan	O
In	O
addition	O
to	O
the	O
standard	O
edition	O
,	O
a	O
limited	O
edition	O
which	O
included	O
an	O
artbook	O
,	O
an	O
audio	O
drama	O
,	O
and	O
a	O
soundtrack	O
CD	O
,	O
was	O
made	O
available	O
.	O
</s>
<s>
A	O
Microsoft	B-Application
Windows	I-Application
version	O
was	O
released	O
on	O
December	O
21	O
,	O
2012	O
,	O
both	O
separately	O
and	O
in	O
a	O
bundle	O
with	O
Ever	B-Application
17	I-Application
:	I-Application
The	I-Application
Out	I-Application
of	I-Application
Infinity	I-Application
.	O
</s>
<s>
Prior	O
to	O
the	O
game	O
's	O
release	O
,	O
some	O
video	O
game	O
journalists	O
wondered	O
about	O
the	O
game	O
's	O
tone	O
:	O
Spencer	O
at	O
Siliconera	O
said	O
that	O
he	O
was	O
curious	O
about	O
it	O
since	O
KID	O
mostly	O
made	O
bishoujo	O
games	O
,	O
while	O
Run	O
&	O
Gun	O
was	O
best	O
known	O
for	O
otome	B-Application
games	I-Application
;	O
and	O
Andrew	O
Barker	O
at	O
RPGFan	O
thought	O
it	O
would	O
be	O
interesting	O
to	O
see	O
if	O
the	O
game	O
would	O
have	O
a	O
different	O
feeling	O
to	O
it	O
compared	O
to	O
previous	O
Infinity	B-Application
games	O
.	O
</s>
<s>
Derek	O
Heemsbergen	O
,	O
also	O
writing	O
for	O
RPGFan	O
,	O
thought	O
that	O
a	O
new	O
Infinity	B-Application
game	O
was	O
"	O
welcome	O
news	O
"	O
.	O
</s>
<s>
At	O
the	O
end	O
of	O
2011	O
,	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
version	O
was	O
the	O
809th	O
best	O
selling	O
video	O
game	O
of	O
the	O
year	O
in	O
Japan	O
,	O
with	O
5,766	O
copies	O
sold	O
;	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
was	O
on	O
847th	O
place	O
,	O
with	O
5,311	O
copies	O
sold	O
,	O
adding	O
up	O
to	O
a	O
total	O
of	O
11,077	O
copies	O
across	O
both	O
platforms	O
during	O
the	O
debut	O
year	O
.	O
</s>
