<s>
Shadowkeep	B-Device
is	O
a	O
first	O
person	O
role-playing	O
video	O
game	O
and	O
interactive	O
fiction	O
video	O
game	O
with	O
graphics	O
.	O
</s>
<s>
In	O
a	O
GameSpy	O
interview	O
,	O
Shadowkeep	B-Device
was	O
called	O
"	O
a	O
groundbreaking	O
product	O
at	O
the	O
time	O
"	O
,	O
"	O
which	O
paved	O
the	O
way	O
for	O
more	O
complex	O
products	O
like	O
Eye	B-Application
of	I-Application
the	I-Application
Beholder	I-Application
and	O
its	O
peers	O
"	O
.	O
</s>
<s>
Shadowkeep	B-Device
was	O
released	O
for	O
Apple	B-Device
II	I-Device
computers	I-Device
and	O
was	O
written	O
in	O
Ultra	O
II	O
.	O
</s>
<s>
The	O
game	O
was	O
stored	O
on	O
4	O
floppy	B-Device
disks	I-Device
.	O
</s>
<s>
The	O
goal	O
of	O
the	O
game	O
is	O
to	O
rescue	O
the	O
wizard	O
Nacomedon	O
,	O
who	O
has	O
been	O
trapped	O
in	O
his	O
castle	O
,	O
the	O
eponymous	O
Shadowkeep	B-Device
,	O
by	O
an	O
evil	O
Demon	O
,	O
Dal'brad	O
.	O
</s>
<s>
Shadowkeep	B-Device
is	O
a	O
fantasy	O
adventure	O
novel	O
by	O
Alan	O
Dean	O
Foster	O
published	O
in	O
1984	O
by	O
Warner	O
Books	O
.	O
</s>
