Level select - Press B, Select, Left, Right, Start at the title screen.
Twenty-five submarines - Hold A + B, then press Select, Up, Down when the
sub course is being laid out.
Twenty-five missiles - Hold A + B, then press Up, Down when the sub course
is displayed.
Twenty-five fuel units - Hold A + B, then press Select, Left, Right when
the sub course is displayed.
Twenty-five silent runnings - Hold A + B, then press Left, Right at the
mission selection screen
Gamesark codes
Infinite Lives
010332dc
Infinite Energy
016333dc
Infinite Shield
010331dc
Infinite Torpedos
010330dc
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