UnlockablesAccess Endless Mode, Survival Mode, and Combo
Challenge Mode.
Unlock all the hidden songs in the game, and buy them from the shop. Upon
accomplishing this task, Endless Mode, Survival Mode, and Combo Challenge Mode
will be open for purchase in the shop.

Unlock character costumes/outfits
To unlock a character's alternate costume/outfit, play Dance Master Mode with that
character for about 5 missions, and the character's costume/outfit will be available in
the shop. Each costume/outfit costs 100,000 points except for J.C.'s and Sa-Ja's, which
cost 200,000 points

DDR Guitar
Useing a guitar from guitar hero 1 or 2, right as your about to start the game and start danceing replace the controller with the ps2 guitar turn the guitar upsideown and use all the buttons but the green one. (warning must be able to play guitar hero 1 or 2 on medium good for this to work well)

PS2 Cheats for DDR Extreme 2

DDR Extreme 2 cheat codes

DDR Extreme 2 cheats