How do you get a chao black in sonic dx

Ok you can get three types of bonus chao in the dx game. the black chao is located in the egg carier prison block. the gold chao is located in a antique shop in station square. only when you pick it up, iron bars come down over the windows and door so you can't get out. If you want it then your gonna have to find this egg shaped rock, forgoten where. then go back to the shop and replace the gold egg the the stone egg. the silver chao is located in the mystic ruins. go to the lake and head for the steps. near the steps you should find a large push switch. ouce you hit it the silver egg should drop out of the water fall. hope these help