Level select:
At the title screen, press B, Select, Left, Right, Start.
Twenty-five submarines:
When the sub course is being laid out, hold A + B, then press Select, Up, Down.
Twenty-five missiles:
When the sub course is displayed, hold A + B, then press Up, Down.
Twenty-five fuel units:
When the sub course is displayed, hold A + B, then press Select, Left, Right.
Twenty-five silent runnings:
At the mission select screen, hold A + B, then press Left, Right.
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