On the Title screen, hold Left, press A three times, then press Start. This allows you to start your game with 30 ships in reserve, but does not work with Extra Continues code.
5 Extra Continues
On the Title screen, press X quickly until you have nine continues, then press Start. This does not work with the 30 Lives code.
Arcade Mode
In the Option Mode, when "Game Level" is highlighted, press A quickly until the game mode changes to "ARCADE."
Full Options
While playing the game, press Start to pause the game. Then press Up, Up, Down, Down, L Button, R Button, L Button, R Button, B, A and Start. You can do this once per stage.
Random Weapon Select
On the "Weapon Select" screen, press Right to go to the "Edit Mode" screen. Then, press X, Y, X, X, Y, Y, X, Y.
Self Destruction
While playing the game, press Start to pause the game, and then press Up, Up, Down, Down, Left, Right, Left, Right, B, A and Start.
Super Demonstration
On the Title screen, hold A. You will see the Intro screen, the Title screen, and then the Demo on Arcade Mode.
30 Lives...