<s>
It	O
is	O
the	O
second	O
of	O
three	O
games	O
in	O
the	O
Blue	B-Application
Dragon	I-Application
series	O
,	O
and	O
the	O
first	O
of	O
two	O
for	O
the	O
Nintendo	B-Device
DS	I-Device
.	O
</s>
<s>
Blue	B-Application
Dragon	I-Application
Plus	I-Application
is	O
a	O
real	O
time	O
strategy	O
game	O
.	O
</s>
<s>
It	O
can	O
be	O
played	O
entirely	O
with	O
the	O
Nintendo	B-Device
DS	I-Device
stylus	I-Device
.	O
</s>
<s>
Blue	B-Application
Dragon	I-Application
Plus	I-Application
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>
<s>
Blue	B-Application
Dragon	I-Application
Plus	I-Application
entered	O
the	O
Japanese	O
sales	O
charts	O
at	O
number	O
3	O
,	O
selling	O
about	O
21,000	O
units	O
during	O
its	O
debut	O
week	O
.	O
</s>
