SinkSub

SinkSub is an action game which is a variant on Depthcharge. The player controls a battleship, moving left and right on top of the screen, while a number of hostile submarines appears beneath. The player can drop depth charges from the right or the left side of the ship. A depth charge destroys a submarine instantly if it hits, but the charges are rather slow while the submarines move fast so it can be tricky to hit them. A maximum of four charges can be released at a time. The submarines occasionally launch floating mines which move upwards, and if they hit the ship the player loses a life.