<s>
is	O
a	O
first	O
person	O
shoot	O
'	O
em	O
up	O
game	O
released	O
in	O
1983	O
for	O
the	O
Atari	B-Device
8-bit	I-Device
family	I-Device
and	O
Commodore	O
64	O
programmed	O
by	O
Paul	O
Woakes	O
for	O
Novagen	O
Software	O
.	O
</s>
<s>
The	O
gameplay	O
is	O
similar	O
to	O
that	O
of	O
Atari	O
,	O
Inc.	O
'	O
s	O
1980	O
arcade	O
game	O
Battlezone	B-Application
,	O
but	O
with	O
large	O
,	O
sometimes	O
screen-filling	O
,	O
scaled	O
bitmaps	O
instead	O
of	O
wireframe	O
models	O
.	O
</s>
<s>
Versions	O
for	O
the	O
Amiga	B-Device
and	O
Atari	B-Device
ST	I-Device
computers	O
followed	O
much	O
later	O
,	O
in	O
1991	O
.	O
</s>
<s>
It	O
was	O
also	O
re-released	O
by	O
Atlantis	O
Software	O
for	O
the	O
Atari	B-Device
8-bit	I-Device
and	O
Commodore	O
64	O
as	O
a	O
cassette	O
budget	O
title	O
.	O
</s>
<s>
Encounter	O
contains	O
eight	O
environments	O
with	O
three	O
difficulty	O
levels	O
and	O
includes	O
3-D	O
graphics	O
and	O
sound	O
effects	O
to	O
indicate	O
the	O
approach	O
of	O
enemy	O
kamikaze	B-Application
aliens	O
.	O
</s>
<s>
The	O
game	O
contains	O
two	O
level	O
types	O
:	O
a	O
shooting	O
level	O
where	O
alien	O
saucers	B-Language
and	O
drones	O
attack	O
the	O
player	O
in	O
a	O
3-D	O
plane	O
with	O
regularly	O
placed	O
columns	O
and	O
a	O
flying	O
level	O
where	O
the	O
player	O
must	O
navigate	O
a	O
3-D	O
star	O
field	O
by	O
avoiding	O
contact	O
with	O
any	O
foreign	O
objects	O
.	O
</s>
<s>
In	O
1991	O
,	O
the	O
game	O
was	O
converted	O
to	O
the	O
Amiga	B-Device
.	O
</s>
<s>
However	O
,	O
the	O
gameplay	O
was	O
outdated	O
,	O
and	O
Amiga	B-Device
Joker	O
gave	O
it	O
a	O
mediocre	O
score	O
of	O
57%	O
,	O
stating	O
that	O
it	O
was	O
good	O
enough	O
for	O
a	O
short	O
play	O
from	O
time	O
to	O
time	O
.	O
</s>
