<s>
Spheres	B-Device
of	I-Device
Chaos	I-Device
is	O
a	O
multidirectional	O
shooter	O
video	O
game	O
,	O
created	O
by	O
Iain	O
McLeod	O
,	O
with	O
basic	O
gameplay	O
similar	O
to	O
the	O
1979	O
arcade	O
game	O
Asteroids	B-Application
.	O
</s>
<s>
The	O
audio	O
is	O
similar	O
to	O
that	O
of	O
Robotron	B-Application
:	I-Application
2084	I-Application
and	O
Defender	B-Application
.	O
</s>
<s>
It	O
was	O
originally	O
written	O
for	O
RISC	B-Operating_System
OS	I-Operating_System
on	O
the	O
Acorn	B-Device
Archimedes	I-Device
and	O
released	O
in	O
1993	O
.	O
</s>
<s>
In	O
the	O
2000s	O
it	O
was	O
ported	O
to	O
Linux	B-Application
,	O
Microsoft	B-Application
Windows	I-Application
,	O
and	O
PS2	B-Device
Linux	I-Device
.	O
</s>
<s>
In	O
October	O
2007	O
,	O
Spheres	B-Device
of	I-Device
Chaos	I-Device
was	O
declared	O
freeware	B-License
.	O
</s>
<s>
Black	B-Application
holes	I-Application
also	O
appear	O
that	O
either	O
attract	O
or	O
repel	O
the	O
spaceship	O
.	O
</s>
<s>
Many	O
black	B-Application
holes	I-Application
at	O
once	O
may	O
make	O
the	O
game	O
field	O
unnavigable	O
.	O
</s>
