<s>
Star	B-Application
Castle	I-Application
is	O
a	O
vector	O
graphics	O
multidirectional	O
shooter	O
released	O
in	O
arcades	O
by	O
Cinematronics	O
in	O
1980	O
.	O
</s>
<s>
Star	B-Application
Castle	I-Application
was	O
designed	O
by	O
Tim	O
Skelly	O
and	O
programmed	O
by	O
Scott	O
Boden	O
.	O
</s>
<s>
Skelly	O
created	O
a	O
number	O
of	O
other	O
Cinematronics	O
vector	O
games	O
,	O
including	O
Starhawk	B-Application
,	O
Armor	B-Application
Attack	I-Application
,	O
and	O
Rip-Off	B-Application
.	O
</s>
<s>
A	O
Vectrex	B-Operating_System
port	O
of	O
Star	B-Application
Castle	I-Application
for	O
was	O
released	O
in	O
1983	O
.	O
</s>
<s>
The	O
object	O
of	O
Star	B-Application
Castle	I-Application
is	O
to	O
destroy	O
an	O
enemy	O
cannon	O
which	O
sits	O
in	O
the	O
center	O
of	O
three	O
concentric	O
,	O
rotating	O
energy	O
shield	O
rings	O
while	O
avoiding	O
or	O
destroying	O
"	O
mines	O
"	O
enemies	O
that	O
spawn	O
from	O
the	O
core	O
,	O
pass	O
through	O
the	O
energy	O
rings	O
,	O
and	O
then	O
home	O
in	O
on	O
the	O
player	O
's	O
ship	O
.	O
</s>
<s>
Michael	O
Blanchet	O
's	O
1982	O
book	O
How	O
to	O
Beat	O
the	O
Video	O
Games	O
praised	O
Star	B-Application
Castle	I-Application
as	O
"	O
a	O
standout	O
among	O
the	O
wave	O
of	O
free-flight	O
games	O
that	O
emerged	O
after	O
Asteroids	B-Application
"	O
,	O
describing	O
the	O
game	O
's	O
increase	O
in	O
difficulty	O
over	O
time	O
,	O
rather	O
than	O
between	O
game	O
levels	O
,	O
as	O
the	O
"	O
catch	O
"	O
which	O
made	O
it	O
challenging	O
.	O
</s>
<s>
In	O
1995	O
,	O
Flux	O
magazine	O
ranked	O
Star	B-Application
Castle	I-Application
83rd	O
on	O
their	O
Top	O
100	O
Video	O
Games	O
,	O
calling	O
it	O
"	O
One	O
of	O
the	O
all-time	O
great	O
vector	O
graphics	O
classics	O
"	O
.	O
</s>
<s>
Atari	O
,	O
Inc	O
.	O
programmer	O
Howard	O
Scott	O
Warshaw	O
investigated	O
writing	O
a	O
clone	O
of	O
Star	B-Application
Castle	I-Application
for	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
,	O
but	O
did	O
n't	O
see	O
the	O
game	O
as	O
a	O
good	O
match	O
for	O
the	O
system	O
,	O
technically	O
.	O
</s>
<s>
He	O
reconfigured	O
the	O
concept	O
into	O
Yars	B-Application
 '	I-Application
Revenge	I-Application
,	O
which	O
became	O
Atari	O
's	O
top	O
selling	O
original	O
game	O
for	O
the	O
2600	O
.	O
</s>
<s>
A	O
hobbyist-written	O
clone	O
of	O
Star	B-Application
Castle	I-Application
for	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
was	O
eventually	O
released	O
in	O
2012	O
.	O
</s>
<s>
Jim	O
Nitchals	O
of	O
Cavalier	O
Computer	O
wrote	O
a	O
clone	O
for	O
the	O
Apple	B-Device
II	I-Device
called	O
Ring	O
Raiders	O
(	O
referenced	O
in-game	O
as	O
Raiders	O
of	O
the	O
Lost	O
Ring	O
)	O
(	O
1981	O
)	O
.	O
</s>
<s>
Anthony	O
Weber	O
of	O
Stedek	O
Software	O
wrote	O
a	O
clone	O
for	O
the	O
Atari	B-Device
8-bit	I-Device
family	I-Device
called	O
Star	O
Island	O
(	O
1982	O
)	O
.	O
</s>
