<s>
is	O
an	O
action	B-Application
arcade	B-Application
video	I-Application
game	I-Application
developed	O
by	O
Orca	O
Corporation	O
and	O
released	O
by	O
GGI	O
in	O
Japan	O
in	O
1981	O
.	O
</s>
<s>
Tigervision	O
released	O
an	O
Atari	B-General_Concept
2600	I-General_Concept
version	O
in	O
1984	O
.	O
</s>
<s>
River	B-Application
Patrol	I-Application
is	O
an	O
action	B-Application
game	I-Application
where	O
players	O
take	O
the	O
role	O
of	O
a	O
captain	O
navigating	O
a	O
river	B-Application
patrol	I-Application
boat	O
across	O
multiple	O
levels	O
to	O
rescue	O
drowning	O
people	O
who	O
fell	O
into	O
the	O
crocodile-infested	O
river	O
for	O
points	O
while	O
avoiding	O
incoming	O
boulders	O
,	O
floating	O
logs	O
and	O
other	O
obstacles	O
that	O
threaten	O
to	O
sink	O
the	O
vessel	O
.	O
</s>
<s>
Once	O
all	O
lives	O
are	O
lost	O
,	O
the	O
game	B-Application
is	I-Application
over	I-Application
unless	O
the	O
player	O
inserts	O
more	O
credits	O
into	O
the	O
arcade	O
machine	O
to	O
continue	O
playing	O
.	O
</s>
<s>
River	B-Application
Patrol	I-Application
was	O
the	O
second	O
game	O
to	O
be	O
developed	O
by	O
Orca	O
Corporation	O
,	O
a	O
Japanese	O
video	O
game	O
developer	O
headed	O
by	O
Takeshi	O
Tozu	O
,	O
after	O
1980	O
's	O
Shogun	O
.	O
</s>
<s>
An	O
Atari	B-General_Concept
2600	I-General_Concept
port	O
,	O
developed	O
by	O
Tigervision	O
,	O
was	O
released	O
in	O
1984	O
.	O
</s>
<s>
In	O
Japan	O
,	O
River	B-Application
Patrol	I-Application
was	O
the	O
eleventh	O
highest-grossing	O
arcade	B-Application
video	I-Application
game	I-Application
of	O
1981	O
.	O
</s>
<s>
In	O
a	O
retrospective	O
review	O
,	O
Atari	O
Gaming	O
Headquarters	O
Keita	O
Iida	O
gave	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
port	O
a	O
six	O
out	O
of	O
ten	O
score	O
.	O
</s>
<s>
The	O
1981	O
VIC-20	B-Device
game	O
River	B-Application
Rescue	I-Application
has	O
strong	O
similarities	O
to	O
River	B-Application
Patrol	I-Application
,	O
but	O
scrolls	O
horizontally	O
.	O
</s>
<s>
In	O
1982	O
,	O
Koichi	O
Nakamura	O
programmed	O
a	O
clone	O
of	O
River	B-Application
Patrol	I-Application
for	O
the	O
PC-8001	B-Device
,	O
also	O
titled	O
River	B-Application
Rescue	I-Application
,	O
that	O
was	O
published	O
in	O
the	O
Maikon	O
Game	O
Book	O
4	O
special	O
edition	O
of	O
Japanese	O
magazine	O
I/O	O
.	O
</s>
<s>
After	O
the	O
release	O
of	O
River	B-Application
Patrol	I-Application
into	O
the	O
market	O
,	O
Orca	O
would	O
go	O
on	O
to	O
work	O
on	O
several	O
projects	O
:	O
The	O
Percussor	O
,	O
The	O
Bounty	O
,	O
Looper	O
,	O
Springer	O
,	O
Funky	O
Bee	O
,	O
Slalom	O
and	O
Sky	O
Lancer	O
,	O
Vastar	B-Application
(	O
published	O
by	O
Sesame	O
Japan	O
Corporation	O
)	O
,	O
and	O
Espial	O
,	O
among	O
others	O
.	O
</s>
