Successfully complete and save the game on the normal difficulty setting to unlock an "Extra" option at the main menu.
Extra 2 option
Successfully complete and save the game on the hard difficulty setting to unlock an "Extra 2" option at the main menu.
Full double shot power-up
Pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, Square, Triangle. This can only be done a limited amount of times.
Full laser shot power-up
Pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle. This can only be done a limited amount of times.
Alternate modes
When you beat the game in normal mode you unlock the extra mode that includes the Chain Attack. It also includes an ultra play video that shows you how to get more points and it lets you see your ranking. Also after you beat the game in hard mode you unlock the two extra mode in the extra mode menu. This includes another ultra play movie that shows you how to get a 400 chain. There is also a screen saver that plays a fireworks show for you, and a fireworks mode where you make your own fireworks show!
Unlock Everything
To unlock Cheat Mode, go to the Options Menu. Hold all four shoulder buttons, then press X, UP, X, UP, DOWN, SQUARE.