At the Option Menu highlight Game Level and keep press A until Game Level changes to Arcade. Press Start Start to begin in Arcade Mode.
At the Title screen hold Left and press A A A.
At the Title screen keep press X until the total number of credits is eight.
Pause gameplay and press Up Up Down Down L R L R B A.
5 more 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.
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.
This code is similar to the Full Options code, but destroys your ship. 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.