<s>
Citadel	B-Operating_System
:	I-Operating_System
Adventure	I-Operating_System
of	I-Operating_System
the	I-Operating_System
Crystal	I-Operating_System
Keep	I-Operating_System
is	O
a	O
fantasy	B-Application
adventure	O
video	O
game	O
developed	O
by	O
Postcraft	O
International	O
,	O
Inc	O
.	O
and	O
released	O
in	O
1989	O
.	O
</s>
<s>
The	O
game	O
was	O
developed	O
for	O
the	O
Macintosh	B-Device
.	O
</s>
