Beat the game once and save the clear data file then load it to unlock "Hard Mode".Your Imagi Cards carry over to this.

Finish the game once to see a slightly different intro when you load up the game.

Rescue all 28 Mystics before completing the game. Proceed to finish the game and make a clear game save. The Jukebox will be unlocked and can be accessed on the title screen under the new 'Extras' category. This will allow you to listen to all the music from the game.