This tries to do too many thing without doing anything well. First up, you control a boat with your job to shoot the enemy's ships. With only 8 directions that the SNES allowed for, this is too inaccurate and boring. When that's over you control Mariner trying to collect treasure from the deep while trying to avoid sea creatures. Then you are back to controlling the boat. And finally Mariner is back on a ship, this time with a sword/gun fighting villains. The combat here is poor, particularly with the sword.