Press Left(2), L(2), Right(2), Left(2) at the main menu to access 
the cheat menu. 

All items:
Enable the "Cheat mode" code. Press R, C-Right , Right, L, C-Left , 
Left, C-Right, Right at the main menu. 

Unlimited jet pack fuel:
Enable the "All items" code while flying with the jet pack. 

Invincibility:
Enable the "Cheat mode" code. Press R(7), Left at the main menu. 
A tone will confirm correct code entry. The invincibility option may 
now be enabled on the cheat menu. 

Energy refill:
Destroy any water source, including fountains, fire hydrants, and 
toilets. Stand in the water and hold A to slowly restore energy. Alternately, 
stand in front of a toilet or urinal and press A. 

Fire protection:
Continually jump while over hot spots to avoid damage.

Level Skip:
Press L(3), C-Right, Right, Left(2), C-Left