<s>
Ragnarok	B-Application
DS	I-Application
,	O
known	O
in	O
Japan	O
as	O
,	O
is	O
a	O
Nintendo	B-Device
DS	I-Device
video	O
game	O
based	O
on	O
the	O
MMORPG	B-Protocol
Ragnarok	B-Protocol
Online	I-Protocol
and	O
was	O
released	O
in	O
Japan	O
on	O
December	O
18	O
,	O
2008	O
.	O
</s>
<s>
GungHo	O
Online	O
Entertainment	O
,	O
the	O
company	O
that	O
hosts	O
the	O
Japanese	O
server	O
of	O
Ragnarok	B-Protocol
Online	I-Protocol
,	O
expanded	O
its	O
business	O
for	O
video	B-Device
game	I-Device
consoles	I-Device
;	O
Ragnarok	B-Application
DS	I-Application
is	O
the	O
sixth	O
of	O
eight	O
games	O
for	O
DS	B-Device
to	O
be	O
released	O
by	O
them	O
,	O
along	O
with	O
Love	O
Revo	O
!!	O
</s>
<s>
DS	B-Device
,	O
Indo	O
Shiki	O
Keisan	O
Drill	O
DS	B-Device
,	O
Aqua	O
Zone	O
DS	B-Device
,	O
100	O
Kiri	O
Golf	O
DS	B-Device
,	O
Hero	B-Application
's	I-Application
Saga	I-Application
Laevatein	I-Application
Tactics	I-Application
,	O
Minna	O
de	O
Jibun	O
no	O
Setsumeisho	O
:	O
B-Kata	O
,	O
A-Kata	O
,	O
AB-Kata	O
,	O
O-Kata	O
and	O
Ecolis	O
:	O
Aoi	O
Umi	O
to	O
Ugoku	O
Shima	O
.	O
</s>
<s>
The	O
game	O
is	O
designed	O
to	O
be	O
almost	O
entirely	O
controlled	O
by	O
the	O
DS	B-Device
stylus	O
for	O
simplicity	O
and	O
ease	O
of	O
use	O
.	O
</s>
<s>
The	O
game	O
received	O
"	O
mixed	O
"	O
reviews	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
