Play the following tracks at the "Sound Test" screen to activate the corresponding cheat function.

Function	Code
Secret special stage	PGM 07, DA 07
Hidden artwork #1	PGM 12, DA 11
Hidden artwork #2	PGM 12, DA 2
Hidden artwork #3	PGM 03, DA 0
Hidden artwork #4	PGM 04, DA 2
Hidden artwork #5	PGM 11, DA 0