Simply enter the following passwords to unlock the corresponding level...
Level
2... Up, X, Triangle, Right, Left, Square, Circle, X
3... Triangle, Circle, Down, Left, Square, Square, Up, Up
4... X, Right, Left, X, Circle, Square, Square,Triangle
5... Down, Down, Circle, Square, Circle, Square,Right, X
6... Triangle, X, Up, Left, Right, Left, Circle, Triangle
7... Right, Square, Right,Down, Circle, X, X, Right
8... Triangle, Right, Square, Square, Circle, Down, Down, X
9... Up, X, Square, Left, Right, Circle, Left, Left
10... Triangle, Up, Circle, X, Square, Down, Down, Down
11... Circle, Circle, Up, Left, Right, X, Triangle, Square
12... Left, Up, X, Right, Circle, Square, Triangle, Circle
13... Left, Left, Triangle, Circle, X, X, Down, Right
14... Square, Right, Circle, Up, Down, Square, Down, X
15... Left, Right, Circle, X, Square, Down, Down, Circle
16... Triangle, Circle, X, Right, Right, Circle, Square, Down
17... Square, Up, Up, Right, Left, Square, Down, X
18... Circle, X, Right, Triangle, Square, Up, X, X
19... Down, Right, X, Square, Right, Up, Circle, Circle
20... Up, X, Circle, Up, Left, Square, Circle, X