In this sequel to 688 Attack Sub the player controls the nuclear submarine SSN-21 Seawolf. The theatre of war is set during a conflict between Russia and NATO countries. The player has to go through 33 different missions (which can be played in any order or as part of a campaign) on the Atlantic Ocean, Black Sea, Baltic Sea, Red Sea. In comparison with the predecessor, the game has been greatly improved in terms of audio-visual presentation. It also offers multiplayer gameplay through link-up or a null modem solution.