<s>
River	B-Application
Raid	I-Application
is	O
a	O
vertically	O
scrolling	O
shooter	O
designed	O
and	O
programmed	O
by	O
Carol	O
Shaw	O
and	O
published	O
by	O
Activision	O
in	O
1982	O
for	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
video	B-Device
game	I-Device
console	I-Device
.	O
</s>
<s>
Activision	O
later	O
ported	O
the	O
title	O
to	O
the	O
Atari	B-General_Concept
5200	I-General_Concept
,	O
ColecoVision	B-Device
,	O
and	O
Intellivision	B-Operating_System
consoles	O
,	O
as	O
well	O
as	O
to	O
the	O
Commodore	O
64	O
,	O
IBM	B-Device
PCjr	I-Device
,	O
MSX	B-Operating_System
,	O
ZX	B-Operating_System
Spectrum	I-Operating_System
,	O
and	O
Atari	B-Device
8-bit	I-Device
family	I-Device
.	O
</s>
<s>
Shaw	O
did	O
the	O
Atari	B-Device
8-bit	I-Device
and	O
Atari	B-General_Concept
5200	I-General_Concept
ports	O
herself	O
.	O
</s>
<s>
For	O
its	O
time	O
,	O
River	B-Application
Raid	I-Application
provided	O
an	O
inordinate	O
amount	O
of	O
non-random	O
,	O
repeating	O
terrain	O
despite	O
constrictive	O
computer	B-General_Concept
memory	I-General_Concept
limits	O
.	O
</s>
<s>
For	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
the	O
game	O
with	O
its	O
program	B-Application
code	O
and	O
graphics	O
had	O
to	O
fit	O
into	O
a	O
4	O
KB	O
ROM	B-Device
.	O
</s>
<s>
The	O
game	O
program	B-Application
does	O
not	O
actually	O
store	O
the	O
sequence	O
of	O
terrain	O
and	O
other	O
objects	O
.	O
</s>
<s>
Instead	O
,	O
a	O
procedural	O
generation	O
algorithm	O
manifests	O
them	O
by	O
employing	O
a	O
linear-feedback	B-Architecture
shift	I-Architecture
register	I-Architecture
with	O
a	O
hard-coded	O
starting	O
value	O
,	O
also	O
called	O
a	O
pseudorandom	B-Algorithm
number	I-Algorithm
generator	I-Algorithm
.	O
</s>
<s>
Because	O
of	O
this	O
the	O
algorithm	O
generates	O
the	O
same	O
game	O
world	O
every	O
time	O
the	O
program	B-Application
executes	O
.	O
</s>
<s>
The	O
enemy	O
crafts	O
 '	O
AI	B-Application
relies	O
on	O
another	O
pseudorandom	B-Algorithm
number	I-Algorithm
generator	I-Algorithm
to	O
make	O
the	O
start	O
of	O
the	O
enemy	O
movement	O
less	O
predictable	O
as	O
this	O
pseudorandom	B-Algorithm
number	I-Algorithm
generator	I-Algorithm
's	O
starting	O
value	O
is	O
not	O
reset	O
when	O
a	O
new	O
game	O
starts	O
.	O
</s>
<s>
InfoWorld	O
in	O
1983	O
stated	O
that	O
River	B-Application
Raid	I-Application
might	O
be	O
the	O
best	O
Atari	B-Device
8-bit	I-Device
game	O
of	O
the	O
year	O
,	O
"	O
more	O
challenging	O
than	O
any	O
VCS	O
version	O
"	O
and	O
superior	O
to	O
others	O
like	O
Caverns	B-Application
of	I-Application
Mars	I-Application
.	O
</s>
<s>
Antic	O
in	O
1984	O
said	O
that	O
the	O
Atari	B-Device
8-bit	I-Device
version	O
was	O
identical	O
to	O
the	O
2600	O
original	O
,	O
but	O
with	O
slightly	O
"	O
spiffed	O
up	O
...	O
game	O
visuals	O
"	O
.	O
</s>
<s>
The	O
Deseret	O
News	O
in	O
1984	O
called	O
River	B-Application
Raid	I-Application
"	O
one	O
of	O
the	O
most	O
playable	O
and	O
entertaining	O
of	O
all	O
war	O
games	O
"	O
.	O
</s>
<s>
The	O
newspaper	O
gave	O
the	O
ColecoVision	B-Device
version	O
four	O
stars	O
,	O
recommending	O
it	O
to	O
all	O
console	O
owners	O
and	O
describing	O
it	O
as	O
"	O
a	O
definite	O
winner	O
all	O
the	O
way	O
"	O
.	O
</s>
<s>
Computer	O
and	O
Video	O
Games	O
rated	O
the	O
Atari	B-General_Concept
VCS	I-General_Concept
and	O
ColecoVision	B-Device
versions	O
92%	O
in	O
1989	O
.	O
</s>
<s>
River	B-Application
Raid	I-Application
was	O
the	O
first	O
video	O
game	O
to	O
be	O
banned	O
for	O
minors	O
(	O
including	O
a	O
complete	O
ban	O
on	O
advertising	O
,	O
mail	O
ordering	O
and	O
any	O
sort	O
of	O
public	O
display	O
)	O
in	O
West	O
Germany	O
by	O
the	O
Bundesprüfstelle	O
für	O
jugendgefährdende	O
Schriften	O
(	O
Federal	O
Department	O
for	O
Works	O
Harmful	O
to	O
Young	O
Persons	O
,	O
now	O
called	O
the	O
Federal	O
Department	O
for	O
Media	O
Harmful	O
to	O
Young	O
Persons	O
)	O
.	O
</s>
<s>
In	O
1995	O
,	O
Flux	O
magazine	O
ranked	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
version	O
87th	O
in	O
its	O
Top	O
100	O
Video	O
Games	O
.	O
</s>
<s>
In	O
1996	O
,	O
Next	O
Generation	O
listed	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
version	O
as	O
number	O
81	O
on	O
their	O
"	O
Top	O
100	O
Games	O
of	O
All	O
Time	O
"	O
,	O
commenting	O
that	O
,	O
"	O
Nostalgia	O
aside	O
,	O
the	O
2600	O
sucks	O
.	O
</s>
<s>
Activision	O
published	O
the	O
relatively	O
obscure	O
River	B-Application
Raid	I-Application
II	O
for	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
in	O
1988	O
.	O
</s>
<s>
The	O
Games	O
Machine	O
magazine	O
reviewed	O
River	B-Application
Raid	I-Application
2	O
and	O
gave	O
it	O
a	O
76%	O
rating	O
.	O
</s>
<s>
A	O
further	O
sequel	O
called	O
River	B-Application
Raid	I-Application
:	O
The	O
Mission	O
of	O
No	O
Return	O
was	O
a	O
planned	O
release	O
for	O
the	O
SNES	B-Application
in	O
1991	O
but	O
it	O
was	O
cancelled	O
.	O
</s>
<s>
In	O
1995	O
,	O
River	B-Application
Raid	I-Application
was	O
published	O
for	O
Microsoft	B-Application
Windows	I-Application
as	O
part	O
of	O
Activision	B-Application
's	I-Application
Atari	I-Application
2600	I-Application
Action	I-Application
Pack	I-Application
.	O
</s>
