Enter Up, Down, Up, Down, Up, Down, Up, Down as a password.

Enter Down, Down, Down, Down, X, X, Circle, Circle as a password.

Enter Triangle, Down, Triangle, Down, Square, Up, Square, Up as a password.

Enter Square, Down, X, Down, Right, Right, Up, Up as a password. Then, complete mission 16 to see a different ending.

Mission	Password
2	X , Down , Left , Left , Square , Circle , Circle , Right
3	Triangle , Up , Left , Right , Down , Triangle , Circle , Up
4	Down , Down , Square , Square , Left , Right , Circle , X
5	Right , Right , X , Circle , Down , Up , Down , Up
6	Square , Circle , X , Square , Triangle , Left , Up , Right
8	Right , Down , Left , Up , Triangle , Down , Up , Down
9	Circle , Circle , Right , Up , Right , Up , X , X
10	X , Down , Down , Down , Down , X , Left , Right
11	Triangle , Up , Circle , Down , Square , Left , X , Right
12	Up , Up , Triangle , Triangle , Left , Left , Circle , Circle
13	Left , Down , Left , Down , Square , Circle , Square , Circle
14	Down , Down , Down , Down , X , X , Circle , Circle
15	Square , Right , Left , Circle , Circle , Up , Down , Square
16	Down , Up , Down , Up , Triangle , Circle , Triangle , Circle

Mission	Password
2	Right , Up , Square , X , Up , Circle , Up , Right
3	Left , Down , Left , Down , Up , Up , Up , Up
4	Square , X , X , Square , Circle , Triangle , Triangle , Square
5	Circle , Circle , Square , Down , Down , Square , X , X
6	X , Up , Circle , Down , Triangle , Left , Square , Right
7	Up , Down , Down , Down , Right , Left , Left , Left
8	Left , Left , Triangle , Right , Right , Triangle , Up , Up
9	Square , Square , Square , Circle , Down , Down , Down , Left
10	Circle , Up , Left , Square , Up , Left , Down , Down
11	Triangle , Circle , Triangle , Circle , Up , Up , Down , Down
12	Up , Down , Left , Right , Circle , Circle , Up , Square
13	X , Left , Left , Left , Square , Triangle , Circle , X
14	Left , Down , Left , Down , Square , Circle , Square , Circle
15	Down , Down , Down , Down , X , X , Circle , Circle
16	Triangle , Down , Triangle , Down , Square , Up , Square , Up