Hell Mode

To unlock Hell mode, beat Story mode on the Hard difficulty.

Unlock Hard Mode

Beat the game on Normal Mode.

Chao hairstyle/NiGHTS Wig/Sonic Wig/Ulala hairstyles

Beat hell mode.

Chao hairstyle

Have Sonic Advance 3 inserted into the GBA slot.

NiGHTS Wig

Start Feel the Magic with either Chu Chu Rocket or Sonic Pinball Party in the GBA Slot.

Sonic Wig Start

Feel the Magic with either Sonic Advance or Soinc Advance 2 in the GBA Slot.

Ulala hairstyle

Have Sonic Battle inserted into the GBA slot.

Ulala hairstyle

Have Space Channel 5: Ulala's Cosmic Attack inserted into the GBA slot.

Girl on Menu Screen Loses Her Top

Simply set the language to Japanese, and the girl mysteriously loses her top.