Dancing Stage MegaMix Cheats

Pick single mode and single play and then hold Triangle to go to the
main menu.  The game will think 3 songs have been
completed.  Do this again quickly over and over to unlock every
bonus

Select game mode and single play. Hold Triangle to return to the main menu. The game will act as if three songs have been completed. Repeat this to quickly unlock all songs and bonuses.

Before you turn on your Sony PS2, put a controller instead of dance mat in the socket.
Load up Game Mode/Arcade Mode! Once you've finally a descent song, hold down the 'x' button on your PS2 Controller.
Hold it down for a while - It should load up a cool menu called 'FREEZE ARROW ACTIVE/NON ACTIVE!'
If you make it active, then take out your controller and put back in Dance Mat.
Then in the song it will have special arrows called 'Freeze Arrows' which will come up in a straight line and you have to hold down your foot on the arrow until it stops.
Then at the end of the game it saves.

Select game mode and single play. Hold Triangle to return to the main menu. The game will act as if three songs have been completed. Repeat this to quickly unlock all songs and bonuses.