On level three of City Escape it should say "find the lost chao". Get to the part where you are running down the wall when you hit the spring. Do not go on the swing bar go to the left. There is a ruin there, play mistic melody and jump on it there is a thing that pulls you up. Grab on and jump on the spring robot. It will take you to another pull up thing. Repeat untill you see a swing bar. Grab on to it and swing on it. You should get to a hole in the wall and the chao will be in there.