Here are some cheats and tips for the game Knife Edge: Nose Gunner.
Expert mode:
Hold L + R +C-Up, then press C-Right, C-Left, B at the Kemco logo. A “Super
Hard” difficulty setting may now be selected.
Level select:
Select “Story” or “Team” mode, then hold C-Left + C-Right + C-Up + C-Down +
R and press Right, Up, Left, Down when the level number is displayed.