At the start screen, press the following: Up, Up, Down, Down, Left, Right, Left, Right.

Effect	Code
Background/Image test menu	...& B
Battle animation menu	...& Start
Cacti gymnastics	...& Select
Castle story scene	...& Left
Exit "Gateway to Secret World"	...& Right
Gateway story scene	...& Down
Pirate ship story scene	...& Up
Sound test menu	...& A