<s>
Treasure	B-Application
in	I-Application
the	I-Application
Royal	I-Application
Tower	I-Application
is	O
the	O
fourth	O
installment	O
in	O
the	O
Nancy	O
Drew	O
point-and-click	O
adventure	O
game	O
series	O
by	O
Her	O
Interactive	O
.	O
</s>
<s>
The	O
game	O
is	O
available	O
for	O
play	O
on	O
Microsoft	B-Application
Windows	I-Application
platforms	O
.	O
</s>
<s>
The	O
game	O
was	O
loosely	O
based	O
on	O
a	O
book	O
titled	O
The	B-Application
Treasure	I-Application
in	I-Application
the	I-Application
Royal	I-Application
Tower	I-Application
(	O
1995	O
)	O
.	O
</s>
<s>
According	O
to	O
PC	O
Data	O
,	O
Treasure	B-Application
in	I-Application
the	I-Application
Royal	I-Application
Tower	I-Application
sold	O
42,363	O
units	O
in	O
North	O
America	O
during	O
2001	O
,	O
and	O
another	O
18,301	O
units	O
in	O
the	O
first	O
three	O
months	O
of	O
2002	O
.	O
</s>
<s>
Treasure	B-Application
in	I-Application
the	I-Application
Royal	I-Application
Tower	I-Application
received	O
a	O
"	O
Gold	O
"	O
Parents	O
 '	O
Choice	O
Award	O
in	O
fall	O
2001	O
.	O
</s>
