Shotgun with Infinite Ammo
     When Press Start appears, press Up, Down, left, Right, L, R.

Rifle with Infinite Ammo
     When Press Start appears, press C-Up, C-Down, C-Left, 
C-Right, L, R.

Freeze Thrower with Infinite Ammo
     When Press Start appears, press Down, Up, A, L, R, Z.

Group 1 Multiplayer Characters
     When Press Start appears, press A, L, R, Left, B, Down, Up.

Group 2 Multiplayer Characters
     When Press Start appears, press B, A, A, R, L.

Group 3 Mutliplayer Characters
     When Press Start appears, press L, L, Up, Down, R, B, A

Group 4 Multiplayer Characters
     When Press Start appears, press B, B, B, R, Left, A.

Group 5 Multiplayer Characters
     When Press Start appears, press Right, B, Left, L, A, Z.

Group 6 Multiplayer Characters
     When Press Start appears, press Up, Down, B, A, A, Left.

Skin Select
     When Press Start appears, press C-Left, R, Left, Up, Down, B, A, Z.

First Person View
     When  Press  Start  appears, press Down, Up, L, B, Z, Left, C-Up,
C-Right, C-Left, Z.

Action Nukem Mode
     When Press Start appears, press Down, Down, A, Z, Z, Left, A.