Passwords:
X, Circle, X, Circle, X, Triangle
All levels and easy difficulty
X, Square, Triangle, Triangle, X, Triangle   All levels and medium difficulty
X, Circle, Square, Triangle, X, Triangle      All levels and hard difficulty
Triangle, Triangle, Circle, Triangle, Square, Square   Level skip
Triangle, Square, Square, Square, X, Triangle   Hard mode
X, Triangle, Triangle, Square, X, Triangle
Master mode
Triangle, Triangle, Circle, Triangle, Square, Square   View ending winning credits
Triangle, Square, Circle, Triangle, Circle, CircleView   FMV sequences