Hidden Level: As you blow up the shield generator on the final level (Japan) walk into the centre of the explosion for a hidden level and the 'true' end. Level Select At the Arena Select screen with the globe, highlight Russia and press Right. Before the Japanese mission info appears, hold X + Down-Left. The globe will bounce through different Arenas. To choose a level, release the buttons when the desired level is selected.
Infinite shield (Note 1): 800C4CD0 0064 800C4CD4 0064 800C4CD8 0032 800C4CDC 0032 800C4CE0 0032 800C4CE4 0032 800C4CE8 0032 800C4CEC 0064 Infinite ammo: 8008D1A4 012C 8008D1A8 00FA 8008D1AC 003C 8008D1B0 0046 Infinite missiles: 8008D1D4 000A 8008D1D8 000A 8008D1DC 000A 8008D1E0 000A 8008D1E4 000A 8008D1E8 000A Infinite specials: 8008D1B4 0005 8008D1B8 0003 8008D1BC 0001 8008D1C0 0001 8008D1C4 0001 8008D1C8 0001 Max energy cores: 80089670 00D0 Cannon coolant: 800D1C6C 0000 Stop timer: 800C4CF2 0009 Note 1: This code has been reported not to work in some instances. Our best guess is that a variant version of the game has appeared which cannot use this code.
Cheats: There is a way to select the stage: Select "Start Game" at the title screen. When the blue screen with the Russia mission appears, press right to move to the japan mission. Before the information appears on the screen, press and hold [X] and diagonally Down-Left. To choose one, just let go of the buttons at the point on the globe that you want to play. Just look at the countries as they pass on the globe, and with the correct timing, you will be able to let go and start the game on the mission of your choice. After choosing, you will see your objectives then begin your mission.