<s>
Castle	B-Application
Master	I-Application
is	O
a	O
1990	O
video	O
game	O
by	O
developer	O
Teque	O
Software	O
Development	O
and	O
published	O
by	O
Incentive	O
Software	O
.	O
</s>
<s>
It	O
was	O
released	O
for	O
the	O
ZX	B-Operating_System
Spectrum	I-Operating_System
,	O
Commodore	O
64	O
,	O
Amstrad	B-Device
CPC	I-Device
,	O
Amiga	B-Device
,	O
Atari	B-Device
ST	I-Device
and	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
A	O
compilation	O
was	O
released	O
also	O
in	O
1990	O
that	O
contained	O
the	O
original	O
and	O
the	O
sequel	O
,	O
Castle	B-Application
Master	I-Application
II	O
:	O
The	O
Crypt	O
.	O
</s>
<s>
Castle	B-Application
Master	I-Application
was	O
built	O
on	O
the	O
Freescape	B-Application
engine	I-Application
,	O
which	O
allows	O
solid	O
,	O
fully	O
three-dimensional	O
environments	O
to	O
be	O
produced	O
.	O
</s>
<s>
The	O
same	O
engine	O
was	O
used	O
for	O
Castle	B-Application
Master	I-Application
's	O
sequel	O
,	O
The	O
Crypt	O
,	O
and	O
other	O
games	O
released	O
by	O
Incentive	O
Software	O
.	O
</s>
<s>
The	O
game	O
was	O
ranked	O
the	O
39th	O
best	O
game	O
for	O
the	O
Amiga	B-Device
in	O
Issue	O
0	O
of	O
Amiga	B-Device
Power	O
(	O
May	O
1991	O
)	O
.	O
</s>
