<s>
Some	O
sources	O
claim	O
that	O
Ikegami	O
Tsushinki	O
also	O
did	O
design	O
work	O
on	O
Heli	B-Application
Fire	I-Application
.	O
</s>
<s>
Similar	O
to	O
the	O
1980	O
Taito	O
title	O
Polaris	B-Application
,	O
players	O
control	O
a	O
submarine	O
in	O
which	O
they	O
must	O
survive	O
as	O
long	O
as	O
possible	O
against	O
a	O
barrage	O
of	O
enemy	O
attacks	O
from	O
the	O
sea	O
and	O
above	O
.	O
</s>
<s>
Heli	B-Application
Fire	I-Application
came	O
in	O
both	O
upright	O
and	O
cocktail	O
arcade	O
cabinets	O
.	O
</s>
<s>
It	O
featured	O
color	O
raster	B-Algorithm
graphics	I-Algorithm
utilizing	O
a	O
Sanyo	O
20-DZC	O
monitor	O
.	O
</s>
<s>
According	O
to	O
Florent	O
Gorges	O
 '	O
book	O
The	O
History	O
of	O
Nintendo	O
,	O
Heli	B-Application
Fire	I-Application
,	O
"	O
for	O
once	O
,	O
really	O
put	O
the	O
players	O
 '	O
skills	O
to	O
the	O
test	O
"	O
;	O
he	O
explained	O
that	O
players	O
had	O
to	O
dodge	O
attacks	O
from	O
the	O
air	O
as	O
well	O
as	O
pay	O
attention	O
to	O
what	O
is	O
in	O
the	O
water	O
in	O
order	O
to	O
avoid	O
ships	O
and	O
mines	O
.	O
</s>
<s>
The	O
Killer	B-Application
List	I-Application
of	I-Application
Videogames	I-Application
website	O
listed	O
the	O
game	O
as	O
one	O
of	O
the	O
rarest	O
machines	O
amongst	O
the	O
members	O
of	O
the	O
Video	O
Arcade	O
Preservation	O
Society	O
.	O
</s>
