All cheats for this game by platform: SNES
Level 2: Hold [L] + [R] + [A] + [B] + [X] + [Y] + [Right] on controller two at the mission briefing screen until it disappears.
Level 3: Hold [L] + [R] + [A] + [B] + [X] + [Y] + [Down] on controller two at the mission briefing screen until it disappears.
Level 4: Hold [L] + [R] + [A] + [B] + [X] + [Y] + [Left] on controller two at the mission briefing screen until it disappears.
Level 5: Hold [L] + [R] + [A] + [B] + [X] + [Y] + [Up] on controller two at the mission briefing screen until it disappears.