<s>
The	B-Application
Castle	I-Application
is	O
a	O
video	O
game	O
released	O
by	O
ASCII	O
Corporation	O
in	O
1986	O
for	O
the	O
FM-7	B-Device
and	O
X1	B-Device
computers	O
.	O
</s>
<s>
It	O
was	O
later	O
ported	O
to	O
the	O
MSX	B-Operating_System
and	O
NEC	O
branded	O
personal	O
computers	O
,	O
and	O
got	O
a	O
single	O
console	O
port	O
for	O
the	O
SG-1000	B-Operating_System
.	O
</s>
<s>
It	O
was	O
followed	O
by	O
Castlequest	B-Application
(	O
Castle	B-Application
Excellent	I-Application
in	O
Japan	O
)	O
.	O
</s>
<s>
The	O
object	O
of	O
the	O
game	O
is	O
to	O
navigate	O
through	O
the	B-Application
Castle	I-Application
to	O
rescue	O
the	O
Princess	O
.	O
</s>
<s>
The	O
player	O
can	O
navigate	O
the	B-Application
castle	I-Application
with	O
the	O
help	O
of	O
a	O
map	O
that	O
can	O
be	O
obtained	O
early	O
in	O
the	O
game	O
.	O
</s>
