All levels and helicopters
Type this code in at the password screen to get all levels and helicopters!
Code: R, c-left, right, up

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