In order for this to work, your chao must really like sonic. go to the chao garden(as sonic) on when you pick up a chao and it claps(thats how you know if it really likes you) set down the chao, step away from the chao, but still have it on screen. whistle, the choa will get a ? above its head and then the ? will turn to a ! the chao will start running to you with a heart above its head, its sooo cute!