Army Men: Air Combat cheats and cheat codes for Nintendo 64

Unlock all helicopters and stages:
Type the following button combination as password:
Press R, C-Left, Right, Up

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