Bust a Move 2

Character Select:

Start the game in Puzzle Mode. When the map screen appears, press Left, Left, Up, Down, then press L1+L2+R1+R2 simultaneously. A Character Select will appear. Press Left or Right to change to a different character, then press any of the four action buttons.

Extra Credits:

Choose "Options" from the Title screen, at the Options menu press Left, Right, R1, R2, L2, L1, Up, Down. A 30 second timer will appear in the upper right hand corner of the screen. Quickly highlight the Credits options and start tapping the X button as many times as you possibly can within that 30 seconds, then more times you press X, the more credits you will gain, you can gain up to 30 if you're fast enough.

Background Effects:

At the Title screen, when the words "Press Start" are showing, press R1, Up, L2, Down. You'll see a little green guy appear in the lower right corner. Now start the Puzzle game mode. You should see the words "Another World" at the bottom of the screen. Now check out the new backrounds of the game.