Bust-A-Move 2: Arcade Edition

Character Select in Puzzle Mode
Select Puzzle Mode then Press L, L, U, D, LB, RB, LB, RB, LB + RB.

Alternate Backgrounds
At the Title Screen Press LB, U, RB, D, (Re-enter code to de-select)
A little green guy will appear at the bottom right of the screen to confirm correct code entry.  Select Puzzle Mode and the words "Another World" Will appear at bottom left of screen.