|A 1-player, single screen shoot-em-up, baring many similarities to Taito's most famous shoot-em-up, "Space Invaders", in which a player takes on the role of Commander of a Polaris class nuclear submarine. War has been declared and the Polaris' mission is to defend the country from enemy attack.|
In battle, players must defend against wave after wave of enemy planes (fighter jets and missile-dropping bi-planes) as well as enemy subs and destroyers. Players must also be careful to avoid the many mines and depth charges that litter the ocean.
Game description from www.arcade-history.com