is a side-scrolling shooter game
Shooter game
Shooter games are a sub-genre of action game, which often test the player's speed and reaction time. It includes many subgenres that have the commonality of focusing "on the actions of the avatar using some sort of weapon. Usually this weapon is a gun, or some other long-range weapon". A common...

 published in 1986 by Irem
Irem (company)
is a Japanese video game console developer and publisher, and formerly a developer and manufacturer of arcade games as well. The company has its headquarters in Hakusan, Ishikawa Prefecture....

 for the Nintendo Entertainment System
Nintendo Entertainment System
The Nintendo Entertainment System is an 8-bit video game console that was released by Nintendo in North America during 1985, in Europe during 1986 and Australia in 1987...

. The game is considered somewhat obscure and did not have a big impact on the gaming community.


Aliens who rule the planet Neptune
Neptune is the eighth and farthest planet from the Sun in the Solar System. Named for the Roman god of the sea, it is the fourth-largest planet by diameter and the third largest by mass. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times...

 realize that they have run out of their primary source of nutrition, "man-ham livestock," and decide to invade Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...

 to feed off the humans. They melt the polar ice cap
Polar ice cap
A polar ice cap is a high latitude region of a planet or natural satellite that is covered in ice. There are no requirements with respect to size or composition for a body of ice to be termed a polar ice cap, nor any geological requirement for it to be over land; only that it must be a body of...

s, causing entire continents to sink under the ocean. The General of the Earth Defense Army begs a pirate called Narikeen to strike back at the aliens with his submarine, Sqoon. Narikeen, being of an evil nature, laughs at the pleas of the general, but reluctantly agrees to exterminate the aliens.

However in the Japanese version, the message came from the United States of America's Pentagon and the message says in Romaji:




The player is given Sqoon, a pink submarine, and must use it to destroy the aliens and rescue captured human survivors while trying to avoid coming into contact with enemies and running out of fuel. To accomplish this, Sqoon is equipped with missiles to attack enemies, and an ice ball bomb attack to destroy facilities and release captured humans. When Sqoon has reached its maximum capacity of nine humans, the player must discharge survivors onto an island which will then release power-ups and replenish fuel. Sqoon has a fuel supply which must be replenished every sixty seconds. Failure to do so results in the loss of a life.

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