All weapons: Pause game play and press Start, A, B,
Select(5), Start.
Double points: Pause game play press Start, A, B(2),
A, Right, Down, Up, Left(2),
Start.
Instant stopping: Pause game play and press Up, Down, Left,
Right, Select.
Level skip, extra lives: Pause game play and press Start, A, B,
Select, Right, Left(2), Right, Select,
B, A, B(2), A, Start. Note:
Enable this code when no submarines are remaining to gain additional
lives. This code may only be enabled once per game.
Slow automatic scrolling: Pause game play and press Up, Down, Left,
Right, Up, Down, Left, Right,
Up, Down, Left, Right, A, B(2),
A.
Disable automatic scrolling: Pause game play and press Up(2), Down(2),
Left(2), Right(2).
