<s>
Arcadia	B-Application
is	O
a	O
fixed	O
shooter	O
published	O
by	O
Imagine	O
Software	O
for	O
the	O
ZX	B-Operating_System
Spectrum	I-Operating_System
and	O
VIC-20	B-Device
in	O
1983	O
.	O
</s>
<s>
It	O
was	O
later	O
ported	O
to	O
the	O
Commodore	O
64	O
and	O
Dragon	B-Device
32	I-Device
.	O
</s>
<s>
Arcadia	B-Application
combines	O
elements	O
of	O
Gorf	B-Application
and	O
Galaxian	B-Application
.	O
</s>
<s>
Early	O
VIC-20	B-Device
versions	O
contain	O
a	O
bug	O
causing	O
aliens	O
to	O
stop	O
appearing	O
after	O
the	O
eighth	O
level	O
.	O
</s>
