Bust-A-Move 2: Arcade Edition

Extra levels:
Press X, Left, Right, X at the title screen.
A creature will appear in the bottom right of the screen to confirm correct code entry.
Select single player puzzle mode to access the new levels.

Christmas introduction:
Set the Saturn's internal clock to a date in December.
The new introduction includes: Christmas music, the Bubble Bobble characters in a sled pulled by Bomberman, and a "Merry X-mas" message.

Happy New Year introduction:
Set the Saturn's internal clock to December 31 or January 1.
Soundtrack:
Place the game disc in a standard audio CD player and play tracks two and greater to hear the game music and other sounds.