<s>
Etrian	B-Application
Odyssey	I-Application
is	O
a	O
2007	O
3D	O
dungeon	O
crawler	O
role-playing	O
video	O
game	O
by	O
Atlus	O
for	O
the	O
Nintendo	B-Device
DS	I-Device
.	O
</s>
<s>
It	O
centers	O
around	O
first-person	O
exploration	O
of	O
a	O
mysterious	O
dungeon	O
known	O
as	O
the	O
Yggdrasil	B-Application
Labyrinth	O
using	O
a	O
player-created	O
party	O
of	O
characters	O
.	O
</s>
<s>
A	O
remake	O
,	O
titled	O
Etrian	B-Application
Odyssey	I-Application
Untold	I-Application
:	I-Application
The	I-Application
Millennium	I-Application
Girl	I-Application
,	O
was	O
released	O
for	O
Nintendo	B-Operating_System
3DS	I-Operating_System
in	O
2013	O
.	O
</s>
<s>
A	O
remastered	O
version	O
of	O
the	O
original	O
is	O
set	O
to	O
release	O
for	O
Nintendo	B-Application
Switch	I-Application
and	O
Windows	O
in	O
June	O
2023	O
under	O
the	O
title	O
Etrian	B-Application
Odyssey	I-Application
HD	O
.	O
</s>
<s>
Drawing	O
comparisons	O
to	O
titles	O
such	O
as	O
Wizardry	B-Device
and	O
The	B-Device
Bard	I-Device
's	I-Device
Tale	I-Device
,	O
Etrian	B-Application
Odyssey	I-Application
challenges	O
players	O
with	O
exploring	O
and	O
mapping	O
a	O
vast	O
dungeon	O
.	O
</s>
<s>
Etrian	B-Application
Odyssey	I-Application
requires	O
that	O
players	O
maintain	O
their	O
own	O
map	O
by	O
annotating	O
(	O
with	O
the	O
stylus	B-Device
)	O
a	O
small	O
map	O
displayed	O
on	O
the	O
DS	B-Device
's	O
touchscreen	B-Device
.	O
</s>
<s>
The	O
AI	B-Application
of	O
FOEs	O
varies	O
,	O
but	O
most	O
will	O
wander	O
the	O
dungeon	O
in	O
a	O
set	O
circular	O
path	O
until	O
they	O
sense	O
the	O
player	O
's	O
party	O
,	O
after	O
which	O
they	O
will	O
move	O
directly	O
towards	O
the	O
party	O
.	O
</s>
<s>
Like	O
most	O
early	O
RPGs	O
,	O
Etrian	B-Application
Odyssey	I-Application
uses	O
custom	O
characters	O
from	O
a	O
number	O
of	O
different	O
character	O
classes	O
.	O
</s>
<s>
The	O
game	O
starts	O
with	O
the	O
player	O
forming	O
an	O
adventuring	O
guild	O
in	O
order	O
to	O
explore	O
the	O
mysterious	O
Yggdrasil	B-Application
Labyrinth	O
from	O
the	O
nearby	O
town	O
of	O
Etria	O
.	O
</s>
<s>
Visil	O
,	O
who	O
was	O
actually	O
the	O
immortal	O
lead	O
researcher	O
who	O
created	O
the	O
Yggdrasil	B-Application
Project	O
to	O
restore	O
the	O
planet	O
,	O
merges	O
with	O
the	O
core	O
of	O
Yggdrasil	B-Application
,	O
becoming	O
the	O
Etreant	O
in	O
order	O
to	O
protect	O
Yggdrasil	B-Application
.	O
</s>
<s>
The	O
player	O
defeats	O
him	O
,	O
destroying	O
Yggdrasil	B-Application
.	O
</s>
<s>
The	O
development	O
team	O
within	O
Atlus	O
was	O
led	O
by	O
Kazuya	O
Niinou	O
who	O
also	O
directed	O
the	O
development	O
of	O
Atlus	O
 '	O
first	O
in-house	O
game	O
for	O
the	O
DS	B-Device
,	O
Trauma	B-Application
Center	I-Application
:	I-Application
Under	I-Application
the	I-Application
Knife	I-Application
.	O
</s>
<s>
The	O
game	O
was	O
originally	O
to	O
be	O
released	O
internationally	O
as	O
Yggdrasil	B-Application
Labyrinth	O
,	O
but	O
was	O
renamed	O
to	O
avoid	O
any	O
possible	O
confusion	O
with	O
Yggdra	B-Application
Union	I-Application
(	O
a	O
game	O
published	O
in	O
North	O
America	O
by	O
Atlus	O
a	O
year	O
earlier	O
)	O
or	O
Deep	B-Application
Labyrinth	I-Application
.	O
</s>
<s>
During	O
a	O
Nintendo	O
Direct	O
event	O
on	O
February	O
8	O
,	O
2023	O
,	O
Atlus	O
announced	O
that	O
the	O
game	O
will	O
be	O
remastered	O
in	O
HD	O
and	O
released	O
for	O
Nintendo	B-Application
Switch	I-Application
and	O
Windows	O
on	O
June	O
1	O
,	O
2023	O
.	O
</s>
<s>
The	O
remaster	O
is	O
available	O
for	O
purchase	O
separately	O
or	O
alongside	O
remasters	O
of	O
Etrian	B-Application
Odyssey	I-Application
II	I-Application
and	O
Etrian	B-Application
Odyssey	I-Application
III	I-Application
in	O
the	O
Etrian	B-Application
Odyssey	I-Application
Origins	O
Collection	O
.	O
</s>
<s>
The	O
remastered	O
version	O
is	O
based	O
on	O
the	O
Nintendo	B-Device
DS	I-Device
original	O
instead	O
of	O
its	O
2013	B-Application
remake	I-Application
,	O
and	O
includes	O
updated	O
visuals	O
and	O
music	O
,	O
quality	O
of	O
life	O
changes	O
,	O
and	O
additional	O
character	O
portraits	O
.	O
</s>
<s>
Portraits	O
featuring	O
Joker	O
from	O
Persona	B-Application
5	I-Application
and	O
Ringo	O
from	O
Soul	B-Application
Hackers	I-Application
2	I-Application
were	O
added	O
as	O
DLC	B-Protocol
.	O
</s>
<s>
Etrian	B-Application
Odyssey	I-Application
sold	O
32,511	O
copies	O
in	O
its	O
first	O
week	O
of	O
release	O
in	O
Japan	O
.	O
</s>
<s>
Media	O
Create/Famitsū	O
reported	O
that	O
Etrian	B-Application
Odyssey	I-Application
had	O
sold	O
119,584	O
copies	O
in	O
Japan	O
as	O
of	O
July	O
1	O
,	O
2007	O
.	O
</s>
<s>
Elsewhere	O
,	O
the	O
game	O
received	O
"	O
favorable	O
"	O
reviews	O
according	O
to	O
video	O
game	O
review	B-Application
aggregator	I-Application
Metacritic	O
.	O
</s>
<s>
1UP.com	O
summarized	O
this	O
sentiment	O
by	O
concluding	O
"	O
Etrian	B-Application
Odyssey	I-Application
will	O
definitely	O
appeal	O
more	O
to	O
the	O
OCD	O
'd	O
than	O
the	O
ADD	O
'd	O
,	O
and	O
its	O
punishing	O
difficulty	O
and	O
very	O
deliberate	O
pacing	O
may	O
turn	O
off	O
younger	O
gamers	O
who	O
grew	O
up	O
on	O
flashier	O
roleplayers	O
.	O
</s>
