Chain meter
While playing the game, press Z to display a chain meter under the chain status.

Additional credits
Accumulate at least three or four hours of total game play to get additional credits. By the time you have accumulated six hours, you should have about nine credits from the start, but it is not unlimited.

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.

Gallery 2 option
Successfully complete the game under any difficulty setting to unlock the "Gallery 2" option at the "Appendix" menu. Alternately, accumulate at least ten 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.

Game mode option
Successfully complete the game under the normal difficulty setting without using any continues to unlock the "Game Mode" option at the "Appendix" menu. Alternately, accumulate at least twenty 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.

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