<s>
is	O
a	O
3D	O
role-playing	O
video	O
game	O
developed	O
by	O
Interactive	O
Brains	O
for	O
mobile	O
phone	O
devices	O
and	O
the	O
Nintendo	B-Device
DS	I-Device
handheld	O
game	O
system	O
.	O
</s>
<s>
The	O
Nintendo	B-Device
DS	I-Device
version	O
has	O
an	O
extra	O
,	O
easier	O
scenario	O
intended	O
for	O
casual	O
players	O
,	O
in	O
which	O
the	O
main	O
protagonists	O
are	O
a	O
boy	O
and	O
his	O
pet	O
dog	O
,	O
named	O
Shawn	O
and	O
Ace	O
(	O
Shou	O
and	O
Alf	O
respectively	O
in	O
the	O
Japanese	O
version	O
)	O
respectively	O
.	O
</s>
<s>
Reunited	O
with	O
Ace	O
,	O
Shawn	O
must	O
travel	O
into	O
the	O
heart	O
of	O
the	O
Deep	B-Application
Labyrinth	I-Application
to	O
rescue	O
his	O
parents	O
.	O
</s>
<s>
The	O
North	O
American	O
and	O
Australian	O
box	O
art	O
for	O
the	O
DS	B-Device
version	O
depicts	O
the	O
original	O
scenario	O
,	O
designated	O
as	O
the	O
game	O
's	O
second	O
chapter	O
,	O
titled	O
"	O
Wandering	O
Soul	O
"	O
,	O
while	O
the	O
European	O
and	O
Japanese	O
box	O
art	O
conversely	O
shows	O
the	O
Shawn	O
and	O
Ace	O
scenario	O
,	O
which	O
is	O
designated	O
as	O
the	O
game	O
's	O
first	O
chapter	O
.	O
</s>
<s>
While	O
characters	O
in	O
one	O
story	O
do	O
not	O
appear	O
in	O
the	O
other	O
,	O
both	O
stories	O
appear	O
to	O
occur	O
in	O
the	O
same	O
Deep	B-Application
Labyrinth	I-Application
,	O
as	O
they	O
both	O
include	O
a	O
room	O
called	O
the	O
"	O
Parallel	O
Labyrinth	O
"	O
,	O
which	O
is	O
a	O
hard-to-reach	O
bonus	O
area	O
containing	O
dangerous	O
enemies	O
and	O
special	O
gear	O
in	O
the	O
former	O
story	O
.	O
</s>
<s>
From	O
a	O
first-person	O
perspective	O
,	O
players	O
must	O
navigate	O
through	O
dungeons	O
and	O
environments	O
in	O
a	O
3-D	O
world	O
,	O
battling	O
enemies	O
while	O
searching	O
for	O
items	O
,	O
secret	O
side	O
areas	O
and	O
ways	O
to	O
unlock	O
locked	O
doors	O
,	O
whether	O
with	O
keys	O
or	O
magical	O
spells	B-Application
.	O
</s>
<s>
Both	O
swordplay	O
and	O
sorcery	O
are	O
at	O
the	O
player	O
's	O
disposal	O
,	O
controlled	O
using	O
the	O
Nintendo	B-Device
DS	I-Device
 '	O
stylus	B-Operating_System
and	O
touch	B-Device
screen	I-Device
,	O
and	O
the	O
more	O
frequently	O
a	O
player	O
uses	O
either	O
means	O
of	O
attack	O
,	O
the	O
stronger	O
it	O
will	O
become	O
.	O
</s>
<s>
To	O
cast	O
magic	O
spells	B-Application
,	O
whose	O
names	O
are	O
ancient	O
Greek	O
words	O
(	O
for	O
instance	O
,	O
astrape	O
for	O
thunder	O
and	O
iaomai	O
for	O
healing	O
)	O
,	O
the	O
player	O
must	O
trace	O
out	O
runic	O
Kirie	O
symbols	O
across	O
a	O
3	O
x	O
3	O
grid	O
,	O
using	O
one	O
unbroken	O
stroke	O
of	O
the	O
stylus	B-Operating_System
over	O
select	O
squares	O
in	O
the	O
grid	O
.	O
</s>
<s>
Spells	B-Application
cost	O
mana	B-Application
and	O
most	O
spells	B-Application
must	O
be	O
learned	O
either	O
through	O
leveling	O
up	O
or	O
from	O
reading	O
Kirie	O
slates	O
that	O
will	O
teach	O
particular	O
spells	B-Application
.	O
</s>
<s>
Players	O
can	O
only	O
save	O
their	O
progress	O
by	O
talking	O
to	O
certain	O
non-playable	O
characters	O
,	O
and	O
save	O
points	O
serve	O
as	O
checkpoints	O
;	O
should	O
the	O
player	O
fall	O
in	O
battle	O
from	O
losing	O
all	O
health	O
or	O
getting	O
hit	O
by	O
a	O
death	O
spell	B-Application
,	O
unsaved	O
progress	O
is	O
forfeited	O
and	O
the	O
player	O
must	O
reload	O
a	O
previously	O
saved	O
game	O
.	O
</s>
<s>
Deep	B-Application
Labyrinth	I-Application
was	O
developed	O
by	O
Interactive	O
Brains	O
,	O
with	O
Masato	O
Kato	O
writing	O
the	O
game	O
's	O
scenario	O
and	O
Yasunori	O
Mitsuda	O
composing	O
its	O
music	O
.	O
</s>
<s>
According	O
to	O
Nasaki	O
Takeda	O
,	O
CEO	O
and	O
CTO	O
of	O
Interactive	O
Brains	O
,	O
the	O
mobile	O
phone	O
release	O
of	O
Deep	B-Application
Labyrinth	I-Application
was	O
very	O
popular	O
,	O
having	O
been	O
downloaded	O
nearly	O
100,000	O
times	O
prior	O
to	O
its	O
North	O
American	O
DS	B-Device
launch	O
.	O
</s>
<s>
In	O
Japan	O
,	O
Famitsu	O
gave	O
the	O
DS	B-Device
version	O
a	O
score	O
of	O
one	O
eight	O
and	O
three	O
sixes	O
,	O
for	O
a	O
total	O
of	O
26	O
out	O
of	O
40	O
.	O
</s>
<s>
Elsewhere	O
,	O
though	O
,	O
the	O
port	O
received	O
"	O
mixed	O
"	O
reviews	O
according	O
to	O
video	O
game	O
review	B-Application
aggregator	I-Application
Metacritic	O
.	O
</s>
