Body 2 and 3
Successfully complete story mode on the normal difficulty setting to unlock Body 2 and 3.
Sound Test
Successfully complete story mode on the normal difficulty setting to unlock the sound test option.
Birthday Greeting
The girl will greet you by saying "Happy Birthday" at the main menu on the date that you entered as your birthday in the system settings.
Record Your Own Voice at the Title Screen
While at the title screen, hold Down + Y to record whatever you want into the microphone. It will now play back whatever you recorded at random intervals while the title music plays. However, if you wish to play it back immediately, press Down + X. Down-Left + X will play it back slowly, while Down-Right + X will speed it up.
Talking Credits
When you beat the game and the credit roll through, touch the credits using the DS touch screen. Each section of the credits makes a different sound. An example would be the sound when you hear when you've collected a ring in Sonic games when you touch the Sonic Team logo.
Girl on Menu Screen Loses Her Top
Simply set the language to Japanese, and the girl mysteriously loses her top.
Ulala hairstyle
Have Space Channel 5: Ulala's Cosmic Attack inserted into the GBA slot.
Sonic Wig Start
Feel the Magic with either Sonic Advance or Soinc Advance 2 in the GBA Slot.
NiGHTS Wig
Start Feel the Magic with either Chu Chu Rocket or Sonic Pinball Party in the GBA Slot.
Chao hairstyle
Have Sonic Advance 3 inserted into the GBA slot.
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