All levels and helicopters 
Enter R, C-Left, Right, Up as a password to unlock all levels and helicopters. 

                               Level passwords 
Level           Password 
2         Up, Down, Left, Right 
3         Up, Down, Left, Up 
4         Down, Up, Left, Right 
5         Down, Up, Left, Down 
6         Down, Up, Right, Down 
7         Left, Down, L, Up 
8         Left, Down, L, Down 
9         Left, Up, L, Down 
10        L, Up, Left, Down 
11        L, Up, Left, Up 
12       L, Up, L, Down 
13        L, Down, Up, Left 
14      R, C-Left, Up, Right 
15       C-Down, L, Down, Down 
16       R, C-Left, Right, Up