Original sentence: REDIRECT Heli Fire
Edited sentence: 30 helicopters in groups of 10 and 4 high-speed versions of them attack from different altitudes.A NES/Famicom port was planned, but then was canceled for unknown reasons.A similar arcade game titled N-Sub, developed by SEGA, was released the same year, but the answer to which came out first is unknown.Depth charges released by helicopters into the sea explode at determined underwater depth.If helicopters are not destroyed within the time limit, the helicopters will attack in a special assault pattern.If the players destroy a required number of helicopters, the submarine surfaces, while a native girl dancing on an island boards the submarine, which gives players extra points.It is one of the earliest naval video game titles.Nintendo Database.Player controls submarine in eight directions to evade enemy attacks.Some sources claim that Ikegami Tsushinki also did design work on Heli Fire.The ocean floor rises each time the required number of helicopters are destroyed.Under a starry sky, player must use the submarine to fight off enemy helicopters using missiles and rockets.is a 1980 arcade game by Nintendo R&D1