Here are some cheats and tips for the game The Hunt For Red October.
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.