<s>
Citadel	B-Application
2	I-Application
is	O
a	O
BBC	B-Device
Micro	I-Device
game	O
developed	O
by	O
Symo	O
for	O
Superior	B-Device
Software	I-Device
.	O
</s>
<s>
The	O
sequel	O
to	O
Citadel	B-Application
,	O
it	O
is	O
a	O
platform	O
game	O
with	O
puzzle	O
solving	O
elements	O
.	O
</s>
<s>
Like	O
the	O
original	O
,	O
the	O
game	O
's	O
plot	O
involves	O
finding	O
five	O
gems	O
hidden	O
in	O
various	O
locations	O
in	O
a	O
large	O
fort	O
,	O
together	O
with	O
areas	O
outside	O
it	O
(	O
including	O
mines	O
,	O
three	O
trees	O
,	O
a	O
lodge	O
and	O
a	O
floating	O
sky	O
castle	O
)	O
and	O
destroying	O
them	O
in	O
a	O
teleporter	B-General_Concept
hidden	O
at	O
the	O
bottom	O
of	O
a	O
well	O
.	O
</s>
<s>
The	O
game	O
was	O
released	O
in	O
1993	O
on	O
the	O
Play	O
It	O
Again	O
Sam	O
(	O
PIAS	O
)	O
18	O
compilation	O
,	O
which	O
also	O
included	O
the	O
games	O
Nevryon	O
,	O
Holed	O
Out	O
,	O
and	O
E-Type	B-Application
.	O
</s>
<s>
Citadel	B-Application
2	I-Application
has	O
a	O
number	O
of	O
distinctive	O
features	O
.	O
</s>
<s>
As	O
a	O
tribute	O
to	O
the	O
game	O
Atic	B-Application
Atac	I-Application
,	O
a	O
two-part	O
key	O
is	O
required	O
to	O
get	O
past	O
the	O
wall	O
blocking	O
access	O
to	O
the	O
teleporter	B-General_Concept
.	O
</s>
<s>
This	O
was	O
meant	O
to	O
lead	O
to	O
a	O
special	O
set	O
of	O
screens	O
for	O
the	O
BBC	B-Device
Master	I-Device
version	O
which	O
was	O
never	O
written	O
.	O
</s>
<s>
PIAS	O
18	O
was	O
in	O
fact	O
Superior	B-Device
Software	I-Device
's	O
last	O
release	O
for	O
the	O
BBC	B-Device
Micro	I-Device
.	O
</s>
