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Nintendo DS - Feel the Magic: XY/XX cheats

Sound recorder:
Press Y + Down at the title screen.

Naked Girl:
Go to the Nintendo DS language option. Modify the language setting to Japanese.
or
Finish the game on the hell difficulty mode.

Alternate girl costumes 
You can change the girl costume, if you find the all hidden rabbits.

Unlockables:
Body 2 and 3 - Finish story mode on the normal mode
Sound test - Finish story mode on the normal mode
Hard mode - Finish story mode on the normal mode
Hell mode - Finish story mode on the hard mode

Unlock new hairstyles:
Finish the game on the hell mode or insert the 
following GBA games into cartridge slot:

Chu Chu Rocket: Nights hairstyle 
Puyo Pop: Puyo hairstyle 
Sonic Advance 1: Sonic hairstyle 
Sonic Advance 2: Sonic hairstyle 
Sonic Advance 3: Chao hairstyle 
Sonic Battle: Ulala hairstyle 
Sonic Pinball Party: Nights hairstyle