Finish in first place in all course and course variations two times to unlock every costume.
Play as Hinamazu
Complete all sections in all four levels.
The introduction sequence will change after a new record is set.
To play as Hanamuizu beat all the races twice. If you can earn a gold medal on each course he will be unlocked.
Put the CD into a PC CD-Rom and look for 2 images names wallpaper1 and wallpaper2.