All Working Ikaruga Cheats - GameCube

Chain meter
Press [Z] during game play to display a chain meter under the chain status.

Full pause screen
Press [Start] to pause game play, then hold [X] + [Y].

Gallery 1 option
Successfully complete trial mode without using any continues to unlock the "Gallery 1" option at the "Appendix" menu. Alternately, accumulate at least five hours of total game play.

Sound test option
Successfully complete the game under the easy difficulty setting without using any continues to unlock the "Sound Test" option at the "Appendix" menu. Alternately, accumulate at least fifteen hours of total game play.

Control two players at once
Note: This trick requires two Wavebird controllers. Set the receivers on the same channel and use one Wavebird on the same channel. You can then control two players at the same time. Set them side to side (horizontal) or (vertical) above each other by pushing them to the edges of your screen. If one gets wasted, you can quickly change color so you will have one black and the other white.

Increase score permanently
Every time you continue, the last digit of your score goes up by one permanently. For example, if you continued once it is a "1", twice for a "2", etc. This is useful for gauging how much you have continued once the "Free Play" option has been unlocked.

Unlock practice levels faster
If you are having trouble getting to a chapter with one credit to unlock it in practice mode, pause game play when you are about to lose your last life. Then, press [Start] on controller two and use that controller to get to the chapter you wish to unlock. You must not use any continues after that.