<s>
Toon-Doku	B-Device
is	O
a	O
2007	O
sudoku	O
puzzle	O
video	O
game	O
developed	O
by	O
Dragon	O
's	O
Den	O
Unlimited	O
and	O
published	O
by	O
Majesco	O
Entertainment	O
for	O
the	O
Nintendo	B-Device
DS	I-Device
.	O
</s>
<s>
Toon-Doku	B-Device
was	O
received	O
generally	O
negatively	O
by	O
critics	O
,	O
who	O
criticized	O
the	O
game	O
for	O
having	O
poor	O
controls	O
,	O
as	O
well	O
as	O
its	O
replacement	O
of	O
numbers	O
with	O
symbols	O
.	O
</s>
<s>
Toon-Doku	B-Device
follows	O
the	O
same	O
principles	O
as	O
the	O
logic-based	O
puzzle	O
Sudoku	O
.	O
</s>
<s>
In	O
Toon-Doku	B-Device
,	O
players	O
have	O
to	O
fill	O
a	O
9×9	O
grid	O
with	O
different	O
symbols	O
;	O
however	O
,	O
no	O
line	O
or	O
3×3	O
subgrid	O
can	O
feature	O
multiple	O
of	O
the	O
same	O
symbols	O
.	O
</s>
<s>
One	O
of	O
Toon-Doku	B-Device
main	O
gameplay	O
points	O
is	O
the	O
player	O
's	O
ability	O
to	O
draw	O
custom	O
symbols	O
for	O
use	O
within	O
the	O
games	O
puzzles	O
.	O
</s>
<s>
Toon-Doku	B-Device
features	O
three	O
main	O
single-player	O
modes	O
:	O
the	O
instant	O
mode	O
,	O
where	O
players	O
can	O
play	O
over	O
250	O
different	O
sudoku	O
puzzles	O
,	O
the	O
stage	O
mode	O
,	O
which	O
features	O
nine	O
different	O
levels	O
,	O
each	O
with	O
eleven	O
puzzles	O
,	O
and	O
the	O
"	O
Vs	O
.	O
CPU	B-Device
"	O
mode	O
,	O
where	O
the	O
player	O
competes	O
against	O
a	O
CPU	B-Device
.	O
</s>
<s>
Toon-Doku	B-Device
was	O
developed	O
by	O
the	O
American	O
video	O
game	O
development	O
studio	O
Dragon	O
's	O
Den	O
Unlimited	O
.	O
</s>
<s>
Toon-Doku	B-Device
released	O
on	O
April	O
10	O
,	O
2007	O
,	O
in	O
Europe	O
,	O
with	O
a	O
North	O
American	O
release	O
following	O
on	O
April	O
16	O
.	O
</s>
<s>
Toon-Doku	B-Device
received	O
"	O
generally	O
unfavorable	O
reviews	O
"	O
,	O
according	O
to	O
review	O
aggregator	O
Metacritic	O
.	O
</s>
<s>
JC	O
Fletcher	O
of	O
Engadget	B-Application
wrote	O
that	O
the	O
use	O
of	O
symbols	O
makes	O
it	O
harder	O
to	O
solve	O
puzzles	O
,	O
due	O
to	O
it	O
being	O
easier	O
to	O
know	O
that	O
a	O
number	O
is	O
missing	O
in	O
a	O
line	O
,	O
as	O
opposed	O
to	O
a	O
symbol	O
,	O
using	O
a	O
walrus	O
as	O
an	O
example	O
.	O
</s>
<s>
Jeuxvideo.com	O
Jihem	O
was	O
more	O
positive	O
towards	O
the	O
use	O
of	O
symbols	O
,	O
while	O
still	O
writing	O
that	O
the	O
idea	O
was	O
n't	O
original	O
,	O
due	O
to	O
it	O
being	O
used	O
in	O
children	O
's	O
newspaper	O
,	O
as	O
well	O
as	O
another	O
sudoku	O
Nintendo	B-Device
DS	I-Device
game	O
,	O
Zendoku	B-Application
.	O
</s>
<s>
Eric	O
Bratcher	O
of	O
GamesRadar	O
described	O
the	O
controls	O
and	O
interface	O
as	O
"	O
clunky	O
"	O
,	O
in	O
addition	O
to	O
criticizing	O
how	O
it	O
's	O
hard	O
to	O
tell	O
which	O
symbol	O
is	O
which	O
,	O
due	O
to	O
the	O
Nintendo	B-Device
DS	I-Device
 '	O
"	O
fuzzy	O
screen	O
"	O
.	O
</s>
<s>
Jihem	O
disliked	O
the	O
game	O
's	O
use	O
of	O
the	O
Nintendo	B-Device
DS	I-Device
stylus	I-Device
,	O
as	O
he	O
felt	O
it	O
was	O
inprecise	O
.	O
</s>
