Big, small, midget dukes
For big: use expander on target and just before it explodes, put on invinsibility and back off and it will be big.
For midget: repeat "for big" and just use the shrinker.
For small: (permanent) use shrinker and put on invinsibility and back off and voila!
NOTE:dukes stay still unless controlled
Level Select
Enter the cheat menu code and then enter this code: L, L, L, C-Right, Right, Left, Left, C-Left.
Monsters On/Off
Enter the cheat menu code then enter this code: L, C-Left, Left, R, C-Right, Right, C-Left, C-Left, Left
Cheat mode
Key left (2x), L(2x), Right(2x), Left(2x) in the main menu to go into the cheat menu.
All items
In the cheat menu, key in R, C-right, right, L, C-left, left, C-right, right.
Unlimited jetpack
Execute the All items code while you are flying with the jetpack.
Immortal
In the cheatmenu key in R(7x), left. If you did this alright, you will hear a sound.
Cheat mode
Press Left(2), L(2), Right(2), Left(2) at the main menu to access the cheat menu in the NTSC version of the game. For the PAL version of the game, press Left, Down, L(2), Up, Right, Left, Up.
All items
Enable the "Cheat mode" code. Press R, C-Right , Right, L, C-Left , Left, C-Right, Right at the main menu in the NTSC version of the game. For the PAL version of the game, press R, C-Right, Down, L, C-Up, Left, C-Right, Left.
Invincibility
Enable the "Cheat mode" code. Press R(7), Left at the main menu in the NTSC version of the game. A sound will confirm correct code entry. The invincibility option may now be enabled on the cheat menu. For the PAL version of the game, press R, C-Right, R, L, R(3), Left.
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