Step Step Revolution (SSR) mode:
Go to the title screen and press quickly Left, Left, Left, Right, Right,
Right, Left, Right.

SSR mode alternative:
Press Select at the title screen or at the mode selection after you
unlocked this mode in normal gameplay.

Remix mode:
Get the SSR mode and press at the title screen Left, Left, Right, Right.

Remix mode alternative:
Go to the title screen or the mode selection and press Select, Select
after you unlocked this mode in normal gameplay.

Extra music:
Play in diet mode for a few times, then exit the game. A new information will appear. Repeat this
to
get even more music that can be also be played in nonstop and remix modes.