The game screen is a side view of a underwater scene (with the surface towards the top). You control a crosshair at the surface level. The object is to shoot as many ships as possible, before the time runs out. Your torpedoes are launched from the bottom of the screen, and must move upwards to hit the enemy ships (while avoiding the mines that float at different levels of the water). There are several different types of enemy ships, from slow moving destroyers, to fast moving PT boats. An 'explosion' light will flash inside your periscope each time you score a hit. Your submarine can shoot five shots before it has to reload (an automatic action that takes about a second). Your game will be extended if you reach a certain score before time runs out (the score is operator adjustable).
Game description from www.arcade-history.com
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