To enable these codes, enter the password Square, Triangle, Circle, X, Circle, Triangle. You will receive an "Invalid Code" message. Ignore it and exit the screen. Then go back into the Password screen and enter one of the following codes.

UNLIMITED SHIELD:
Square, Circle, Circle, Square, Triangle, X.

INVINCIBILITY:
Triangle, X, Triangle, Triangle, Square, Circle.

CINEMA TEST:
Square, X, Circle, Triangle, Circle, X.

Level  Password
1      Square, Circle, Triangle, X,
       Circle, Square
2      Triangle, Circle, X, Circle,
       Square, X
3      X, Circle, X, Circle,
       Triangle, X
4      X, Square, Triangle, Circle,
       Circle, Triangle
5      Square, Square, Triangle,
       X, X, Triangle
6      Triangle, X, X, X, X, Circle
7      Circle, Circle, Triangle,
       X, Triangle, X
8      Square, Square, X, Triangle,
       Square, Square
9      Triangle, X, X, Triangle,
       Circle, Triangle
10     X, Triangle, Square,
       Circle, Triangle, X
11     Circle, Square, X, X,
       Square, X
12     Square, Triangle, X,
       Square, Circle, X
13     X, X, Circle, Triangle,
       Circle, Triangle