<s>
Fortress	B-Application
is	O
an	O
isometric	O
scrolling	O
shooter	O
written	O
by	O
Mat	O
Newman	O
,	O
developed	O
by	O
Amcon	O
and	O
released	O
by	O
Pace	O
Software	O
on	O
cassette	O
tape	O
for	O
the	O
BBC	B-Device
Micro	I-Device
home	O
computer	O
in	O
1984	B-Application
.	O
</s>
<s>
It	O
is	O
based	O
on	O
the	O
1982	O
Sega	O
arcade	O
game	O
Zaxxon	B-Application
.	O
</s>
<s>
The	O
isometric	B-Application
perspective	I-Application
gameplay	O
was	O
relatively	O
unique	O
for	O
the	O
BBC	O
.	O
</s>
<s>
Fortress	B-Application
is	O
an	O
isometric	O
scrolling	O
shooter	O
in	O
which	O
the	O
player	O
manoeuvres	O
a	O
starfighter	O
along	O
an	O
alley-like	O
terrain	O
.	O
</s>
