<s>
Mutant	B-Device
Herd	I-Device
is	O
an	O
action	B-Application
game	I-Application
written	O
by	O
Jeremy	O
Smith	O
for	O
the	O
VIC-20	B-Device
and	O
published	O
by	O
Thorn	O
EMI	O
in	O
1983	O
.	O
</s>
<s>
Mutant	B-Device
Herd	I-Device
involves	O
protecting	O
a	O
powerhouse	O
from	O
an	O
invasion	O
of	O
mutants	O
.	O
</s>
<s>
Using	O
laser	O
beams	O
,	O
you	O
need	O
to	O
prevent	O
the	O
mutant	B-Device
herds	I-Device
from	O
destroying	O
your	O
powerhouse	O
.	O
</s>
<s>
Electronic	O
Games	O
stated	O
that	O
Mutant	B-Device
Herd	I-Device
"	O
may	O
not	O
be	O
the	O
ultimate	O
VIC-20	B-Device
game	O
,	O
but	O
the	O
graphics	O
are	O
fun	O
,	O
the	O
action	B-Application
is	O
challenging	O
,	O
and	O
it	O
takes	O
at	O
least	O
one	O
step	O
off	O
the	O
beaten	O
game-track	O
"	O
.	O
</s>
