The player controls a
submarine going through enemy territory, and must shoot targets in order to win the game. The player views the action via a
periscope that can be rotated 360 degrees, a rarity for the time. Information provided to the player includes a radar scope, a depth charge detector, a fuel gauge, and an engine temperature gauge for detecting engine overheating. There are eight modes of play, made up of single and two-player mode and four different levels of difficulty for each. ==Development==