All Levels and Helicopters:
Enter R, C-Left, Right, Up as a password to unlock all levels and helicopters.
Level passwords
Level 2
Up, Down, Left, Right
Level 3
Up, Down, Left, Up
Level 4
Down, Up, Left, Right
Level 5
Down, Up, Left, Down
Level 6
Down, Up, Right, Down
Level 7
Left, Down, L, Up
Level 8
Left, Down, L, Down
Level 9
Left, Up, L, Down
Level 10
L, Up, Left, Down
Level 11
L, Up, Left, Up
Level 12
L, Up, L, Down
Level 13
L, Down, Up, Left
Level 14
R, C-Left, Up, Right
Level 15
C-Down, L, Down, Down
Level 16
R, C-Left, Right, Up