Passwords: Enter these codes at the "Special Access" (password) screen:
Level Passwords:
Desert Level: Triangle Square X Triangle X X Square Square
Canyon Level: Circle Triangle Triangle X Circle Circle Square Circle
Airship Level: X Triangle X Square Square Triangle Square Triangle
Volcano Level: Square Triangle X X X Triangle Circle Square
Gauntlet Level: Triangle Circle Triangle Circle Triangle X Square Square
Stormland: Triangle X Triangle Square Circle X Circle Circle