Dance! Dance! Revolution: 2nd Mix

Highlight Hard mode and press Right Select button (x4).

"At the song select screen, press: DOWN, DOWN, DOWN, LEFT, LEFT, RIGHT, RIGHT

Hold both Select buttons for Player-1 and Player-2. Then press Start.
Note: To cancel cheats push Up (x4) before the first song begins.

Press Left (x8) at the song selection screen. (The word "Left" confirms correct entry.) In Left mode, dancers face left.

To activate Hidden mode, push the joystick UP, DOWN, UP, DOWN, UP, DOWN prior to selecting a skill level. (Hidden mode will make half of the arrows disappear.)

Press DOWN, DOWN, DOWN, RIGHT, UP, UP, LEFT or DOWN, DOWN, LEFT, LEFT, LEFT, RIGHT, RIGHT, RIGHT, LEFT, RIGHT prior to selecting a skill level. (The word "Maniac" confirms correct entry.)
Note: To disable Maniac mode, press UP(x8) at the song selection screen.

To unlock 2-Player modes, push 1P Start button. Then hold 2P's right and left Select buttons while pushing 2P Start. (This code unlocks Couple, VS, and Double modes.)