"You can access the Chao Kindergarten from the Chao Lobby, through the door opposite the regular Chao Garden; this door will only appear once you have hatched a Chao." - Chao Island
I think sonic had a really good time not being playable for once and just being supporting cast for his friend shadow. i just know he was soooo excited to explain the controls and not worry about rings and cheer on his friend (and sometimes be a final boss :3)