Unlock Alternate ending
||How to Unlock
||Beat game with all chaos emeralds.
Level Select + Sound Test
Quickly press Up, Down, Left, Right, at the title screen, then hold A while pressing + (a ringing noise should verify success after pressing the Control Pad directions.) This should open the Level Select screen, where you can select any Act, the Special Stage, and the Sound Test. (Note: Controls listed are for the Wii Remote held sideways, the way it is used to play the game.)