Dance Dance Revolution 4th Mix Plus

Left mode:
Press Up, Left(4) at the difficulty selection screen.
Information in this section was contributed by tony.liquids.

Right mode:
Press Up, Right(4) at the song selection screen.
Information in this section was contributed by tony.liquids.

Little mode and flat modes:
Press Left, Down, Right at the difficulty selection screen to enable little mode. Repeat the code to enable flat mode. Repeat the code again to return to normal mode.
Information in this section was contributed by tony.liquids.

Hidden, sudden, and stealth modes:
Press Left, Up, Right at the difficulty selection screen to enable hidden mode. Repeat the code to enable sudden mode. Repeat the code again to enable stealth mode. Repeat the code again to return to normal mode.
Information in this section was contributed by tony.liquids.

Battle Steps and Edit Data modes:
Press Down(2) at the difficulty selection screen in versus mode (for Battle Steps) or any other mode (for Edit Data). Note: Press Up(2) to return to normal.

Mirror mode:
Press Up, Left, Right, Left, Right at the difficulty selection screen. Repeat the code to return to normal mode.

Shuffle mode:
Press Up, Down, Left, Right, Down, Up at the difficulty selection screen. Repeat the code to return to normal mode.