<s>
is	O
an	O
action	B-Application
role-playing	I-Application
game	I-Application
in	O
the	O
Summon	B-Application
Night	I-Application
series	I-Application
for	O
the	O
Nintendo	B-Device
DS	I-Device
.	O
</s>
<s>
Summon	B-Application
Night	I-Application
uses	O
a	O
party	O
based	O
system	O
of	O
three	O
characters	O
at	O
a	O
time	O
and	O
a	O
fully	O
touch-based	O
control	O
system	O
.	O
</s>
<s>
Summon	B-Application
Night	I-Application
:	I-Application
Twin	I-Application
Age	I-Application
uses	O
a	O
fully	O
touch-based	O
control	O
system	O
.	O
</s>
<s>
Gameplay	O
in	O
Summon	B-Application
Night	I-Application
is	O
based	O
on	O
a	O
top-down	O
,	O
hack	O
and	O
slash	O
,	O
RPG	O
similar	O
to	O
Diablo	B-Application
II	I-Application
or	O
Ragnarok	B-Protocol
Online	I-Protocol
.	O
</s>
<s>
Summon	B-Application
Night	I-Application
uses	O
a	O
party	O
based	O
system	O
of	O
three	O
characters	O
at	O
a	O
time	O
.	O
</s>
<s>
The	O
world	O
in	O
which	O
Summon	B-Application
Night	I-Application
:	I-Application
Twin	I-Application
Age	I-Application
takes	O
place	O
is	O
called	O
Clardona	O
.	O
</s>
<s>
The	O
game	O
received	O
"	O
average	O
"	O
reviews	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
