<s>
Root	B-Application
Letter	I-Application
,	O
stylized	O
as	O
√Letter	B-Application
,	O
is	O
a	O
2016	O
visual	O
novel	O
adventure	O
video	O
game	O
developed	O
and	O
published	O
by	O
Kadokawa	O
Games	O
for	O
PlayStation	B-Operating_System
4	I-Operating_System
,	O
PlayStation	B-Device
Vita	I-Device
,	O
Microsoft	B-Application
Windows	I-Application
,	O
Android	B-Application
,	O
and	O
iOS	B-Application
.	O
</s>
<s>
It	O
is	O
the	O
first	O
entry	O
in	O
the	O
Kadokawa	O
Game	O
Mystery	O
brand	O
,	O
and	O
was	O
followed	O
by	O
Root	B-Application
Film	I-Application
in	O
2020	O
.	O
</s>
<s>
Root	B-Application
Letter	I-Application
:	I-Application
Last	I-Application
Answer	I-Application
,	O
a	O
revamp	O
of	O
the	O
game	O
with	O
additional	O
content	O
,	O
including	O
live-action	O
sequences	O
,	O
was	O
released	O
on	O
August	O
30	O
and	O
September	O
3	O
,	O
2019	O
for	O
Europe	O
and	O
North	O
America	O
with	O
an	O
initial	O
release	O
in	O
Asia	O
in	O
December	O
2018	O
.	O
</s>
<s>
Root	B-Application
Letter	I-Application
is	O
set	O
in	O
Matsue	O
,	O
Shimane	O
Prefecture	O
,	O
where	O
the	O
protagonist	O
arrives	O
in	O
search	O
of	O
Fumino	O
Aya	O
,	O
a	O
pen	O
pal	O
friend	O
from	O
high	O
school	O
who	O
had	O
disappeared	O
for	O
15	O
years	O
.	O
</s>
<s>
Key	O
staff	O
from	O
Konami	O
's	O
LovePlus	B-Application
series	O
of	O
dating	O
sim	O
games	O
contributed	O
to	O
the	O
game	O
,	O
including	O
character	O
designer	O
Mino	O
Taro	O
,	O
and	O
producer	O
Akari	O
Uchida	O
.	O
</s>
<s>
Root	B-Application
Letter	I-Application
was	O
released	O
for	O
the	B-Operating_System
PlayStation	I-Operating_System
4	I-Operating_System
and	O
the	O
PlayStation	B-Device
Vita	I-Device
by	O
Kadokawa	O
Games	O
on	O
16	O
June	O
2016	O
in	O
Japan	O
,	O
and	O
by	O
PQube	O
on	O
28	O
October	O
2016	O
in	O
Europe	O
and	O
1	O
November	O
2016	O
in	O
North	O
America	O
.	O
</s>
<s>
It	O
was	O
also	O
released	O
for	O
Microsoft	B-Application
Windows	I-Application
in	O
Japan	O
on	O
31	O
March	O
2017	O
and	O
internationally	O
on	O
7	O
July	O
2017	O
,	O
and	O
for	O
Android	B-Application
and	O
iOS	B-Application
in	O
Japan	O
on	O
25	O
August	O
2017	O
.	O
</s>
<s>
A	O
sequel	O
,	O
Root	B-Application
Film	I-Application
,	O
was	O
announced	O
to	O
be	O
in	O
development	O
in	O
2018	O
.	O
</s>
<s>
In	O
August	O
2018	O
,	O
a	O
new	O
version	O
of	O
the	O
game	O
,	O
Root	B-Application
Letter	I-Application
:	I-Application
Last	I-Application
Answer	I-Application
was	O
announced	O
.	O
</s>
<s>
It	O
was	O
released	O
in	O
Japan	O
on	O
December	O
20	O
for	O
the	B-Operating_System
PlayStation	I-Operating_System
4	I-Operating_System
,	O
PlayStation	B-Device
Vita	I-Device
and	O
Nintendo	O
Switch	O
,	O
while	O
it	O
was	O
released	O
in	O
other	O
parts	O
of	O
the	O
world	O
on	O
September	O
2	O
,	O
2019	O
without	O
having	O
a	O
Vita	O
release	O
.	O
</s>
<s>
Root	B-Application
Letter	I-Application
received	O
"	O
generally	O
favorable	O
"	O
reviews	O
for	O
PlayStation	B-Device
Vita	I-Device
,	O
and	O
"	O
mixed	O
or	O
average	O
"	O
reviews	O
for	O
PlayStation	B-Operating_System
4	I-Operating_System
,	O
according	O
to	O
the	O
review	B-Application
aggregator	I-Application
Metacritic	O
.	O
</s>
<s>
During	O
its	O
opening	O
week	O
in	O
Japan	O
,	O
8,907	O
copies	O
were	O
sold	O
,	O
of	O
which	O
4,855	O
were	O
of	O
the	O
PlayStation	B-Device
Vita	I-Device
version	O
,	O
and	O
4,052	O
of	O
the	B-Operating_System
PlayStation	I-Operating_System
4	I-Operating_System
version	O
.	O
</s>
<s>
Geraint	O
Evans	O
,	O
the	O
head	O
of	O
marketing	O
of	O
PQube	O
,	O
called	O
their	O
Root	B-Application
Letter	I-Application
sales	O
"	O
phenomenal	O
"	O
,	O
with	O
the	O
vast	O
majority	O
sold	O
on	O
the	O
PlayStation	B-Device
Vita	I-Device
.	O
</s>
<s>
A	O
sequel	O
,	O
Root	B-Application
Film	I-Application
,	O
was	O
released	O
in	O
Japan	O
in	O
2020	O
,	O
and	O
in	O
North	O
America	O
in	O
March	O
2021	O
.	O
</s>
