Level skip:
Press Up, Down, Left, Right, Up, Down, Left, Right at the title screen. The word excellent will be spoken to confirm correct code entry. Pause game play and press B + C to jump to the next level.

No overheating:
Note: This feature requires a controller with auto-fire capability. Assign the auto-fire function to shoot the machine gun.

Hint: Level 2: Extra points and ammunition:
Throughout the level, shoot the lights hanging from the ceiling. Items such as extra ammunition or extra points will fall from them. Also, throughout the game ammunition and other items will be hidden in things.