Assume control of a destroyer located at the top of the screen with submarines passing beneath it. The destroyer can deploy up to six depth charges at a time in an attempt to sink the submarines below. The submarines are able to release various mines which float up to the surface hampering the destroyer's progress.
The player has 90 seconds to sink as many submarines as possible but can earn time bonuses by reaching the overtime target scores.
MOUSE: Move Left and Right to move the boat. Left click in front of or behind the boat to drop depth charges. KEYBOARD: Left and Right arrow keys to move the boat. Z and X to drop depth charges fore and aft.